ORCID Profile
0000-0002-4278-4515
Current Organisation
Qingdao University
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Publisher: Hindawi Limited
Date: 27-03-2020
DOI: 10.1155/2020/7517109
Abstract: In some cases, we hope to remove the electrospun nanofibrous mesh from the collector easily. But in some cases such as wound dressing, we observe that the in situ electrospun nanofibers can stick to the collector (e.g., skin). Therefore, the adhesion between the in situ electrospun web and the substrate becomes important in the performance and practical application of the electrospun material. In this paper, we reported a direct pulling method to measure the adhesion and understand the adhesion mechanism. In this method, we used gravity to pull the fiber directly from the substrate and then measured the gravity to calculate the adhesion. This new test method is more convenient and practical than the previously reported methods. In addition, the adhesion of the in situ electrospun web on different substrates (e.g., aluminium foil, wood pulp paper, and silicon paper) was also studied by this method. The adhesion was influenced by spinning voltage, electrical conductivity, and surface roughness of the substrates.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TC31798F
Publisher: American Physical Society (APS)
Date: 24-02-2021
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 07-2018
Publisher: Trans Tech Publications, Ltd.
Date: 08-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.562-564.308
Abstract: Polyaniline (PANI) is a promising functional polymer in the field of toxic gas detection. In this paper, nano-branched coaxial PANI fibers were grown on electrospun poly(methyl methacrylate) (PMMA) nanofibers by an in situ chemical oxidative polymerization method. The resultant PANI/PMMA fibers were characterized by scanning electronic microscopy and Raman spectrum analysis. The conductivity of an in idual coaxial PANI/PMMA fiber is about 2.123 S/cm and that of the conducting PANI coating layer is about 21.8 S/cm. The ammonia sensing properties of the s les were tested by means of impedance analysis. The nano-branched PANI fibers can response significantly to low concentration of ammonia due to large specific surface area, and the sensitivity shows good linear relationship to the ammonia concentration of ppm level. These results indicate that nano-branched coaxial PANI fibers are promising candidate for detection of toxic ammonia gas.
Publisher: Trans Tech Publications, Ltd.
Date: 06-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.936.123
Abstract: Ultrathin indium oxide (In 2 O 3 ) microtubes were successfully fabricated by electrospinning, magnetron sputtering and followed calcination. The hollow In 2 O 3 tubes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-visible spectroscopy. Outer diameter of the microtubes was in the range of 700-900 nm, and inner diameter was about 400-600 nm. Optoelectronic properties of the In 2 O 3 tubes were investigated by irradiation of UV light with different wavelengths (254, 308 and 365 nm). It was found that the In 2 O 3 microtubes had a fast and strong response to UV irradiation.
Publisher: Walter de Gruyter GmbH
Date: 2020
Abstract: Carbon nanofibers (CNFs) were prepared by electrospinning, and silver (Ag) ions were grown on the surface of the CNFs by in situ solution synthesis. The structure and morphology of obtained Ag-doped CNFs (Ag-CNFs) were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The gas sensibility of the composite fiber was investigated by ammonia (NH 3 ) obtained by natural volatilization from 1 to 4 mL of NH 3 solution at room temperature. It was found that the fibers exhibited a sensitive current corresponding to different NH 3 concentrations and a greater response at high concentrations. The sensing mechanism was discussed, and the good absorptivity was demonstrated. The results show that Ag-CNF is a promising material for the detection of toxic NH 3 .
Publisher: IOP Publishing
Date: 28-04-2020
Publisher: Elsevier BV
Date: 10-2018
Publisher: AIP Publishing
Date: 27-12-2017
Publisher: AIP Publishing
Date: 08-09-2017
DOI: 10.1063/1.5000443
Abstract: Pure ZnO and Ce-doped ZnO nanofibers were synthesized via electrospinning-calcination technique. The morphology, composition, structure, humidity sensing and photoelectric properties were characterized. The field-effect curves showed that a single pure ZnO nanofiber is an n-type semiconductor and an in idual Ce-ZnO nanofiber is a p-type semiconductor. The Ce doping and humidity have strong influence on the UV sensing properties of ZnO-based nanofibers. In the dark, the responses [(IVarious RH − I43% RH)/I43% RH] of pure ZnO increased gradually with the increase of humidity, while the responses of Ce-doped ZnO nanofibers decreased. When exposed to UV radiation, the response of pure ZnO nanofibers decreased with increasing humidity, while that of Ce-doped ZnO increased. And the highest responses are around 88.44 and 683.67 at 97% humidity for pure ZnO and Ce-ZnO nanofibers under UV irradiation. In addition, the UV response of Ce-ZnO with good stability and repeatability increases by two orders of magnitude than that of pure ZnO. The sensing mechanism relevant to oxygen and water-related conduction was discussed briefly. These results exhibit that the application prospects of p-type Ce-ZnO nanofibers are promising in the field of photoelectric devices.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0NJ06251K
Abstract: Hiding real information in deluded information can mislead others.
Publisher: IOP Publishing
Date: 22-11-2006
Publisher: IOP Publishing
Date: 05-2022
Abstract: Pr 0.5 Sr 0.5 FeO 3 (PSFO) and La 0.25 Pr 0.25 Sr 0.5 FeO 3 (LPSFO) nanofibers are prepared by electrospinning followed by calcination, and their morphologies, microstructures, electronic transports, and magnetic properties are studied systematically. The temperature-dependent resistance curves of PSFO and LPSFO nanofibers are measured in a temperature range from 300 K to 10 K. With the temperature lowering, the resistance increases gradually and then decreases sharply due to the occurrence of ferromagnetic metal phase. The metal–insulator transition temperatures are about 110 K and 180 K for PSFO and LPSFO nanofibers, respectively. The electronic conduction behavior above the transition temperature can be described by one-dimensional Mott’s variable-range hopping (VRH) model. The hysteresis loops and the field-cooled (FC) and zero-field-cooled (ZFC) curves show that both PSFO nanofiber and LPSFO nanofiber exhibit ferromagnetism. Although the doping of La reduces the overall magnetization intensity of the material, it increases the ferromagnetic ratio of the system, which may improve the performance of LPSFO in solid oxide fuel cell.
Publisher: Springer Science and Business Media LLC
Date: 19-05-2017
Publisher: MDPI AG
Date: 07-10-2020
DOI: 10.3390/NANO10101980
Abstract: Wearable electronics, such as sensors, actuators, and supercapacitors, have attracted broad interest owing to their promising applications. Nevertheless, practical problems involving their sensitivity and stretchability remain as challenges. In this work, efforts were devoted to fabricating a highly stretchable and sensitive strain sensor based on dip-coating of graphene onto an electrospun thermoplastic polyurethane (TPU) nanofibrous membrane, followed by spinning of the TPU/graphene nanomembrane into an intertwined-coil configuration. Owing to the intertwined-coil configuration and the synergy of the two structures (nanoscale fiber gap and microscale twisting of the fiber gap), the conductive strain sensor showed a stretchability of 1100%. The self-inter-locking of the sensor prevents the coils from uncoiling. Thanks to the intertwined-coil configuration, most of the fibers were wrapped into the coils in the configuration, thus avoiding the falling off of graphene. This special configuration also endowed our strain sensor with an ability of recovery under a strain of 400%, which is higher than the stretching limit of knees and elbows in human motion. The strain sensor detected not only subtle movements (such as perceiving a pulse and identifying spoken words), but also large movements (such as recognizing the motion of fingers, wrists, knees, etc.), showing promising application potential to perform as flexible strain sensors.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 05-2014
Publisher: Elsevier BV
Date: 07-2021
Publisher: Elsevier BV
Date: 2022
Publisher: Springer Science and Business Media LLC
Date: 25-06-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NJ01513A
Abstract: A new type of solvent-free electrospinning technique was developed to fabricate micro-fibers.
Publisher: Elsevier BV
Date: 02-2017
Publisher: AIP Publishing
Date: 05-06-2017
DOI: 10.1063/1.4985012
Abstract: Piezoluminescence has achieved enormous advancement in the field of stress sensors, and mechano-driven lightings and displays however the existing piezoluminescent materials universally need the external dopants of lanthanide or transition metal ions to create efficient luminescence. Herein, we report a bright piezoluminescence in undoped piezoelectric semiconductor CaZnOS, which is multi-mechano-sensitive to ultrasonic vibration, friction, impact and compression. Our experimental and density functional theory computational investigations indicate that the intrinsic oxygen vacancies of VO2+, VO+ and VO0 act as luminescent centers and trap states in multi-colored components of luminescence. In addition to saving resources and protecting environment, our research is expected to open a door for design and development of self-piezoluminescent materials, thereby largely expanding our understanding of piezoluminescent mechanism and promoting further utilization of piezoluminescence.
Publisher: MDPI AG
Date: 10-11-2018
Abstract: In this paper, we report an interesting bubble melt electrospinning (e-spinning) to produce polymer microfibers. Usually, melt e-spinning for fabricating ultrafine fibers needs “Taylor cone”, which is formed on the tip of the spinneret. The spinneret is also the bottleneck for mass production in melt e-spinning. In this work, a metal needle-free method was tried in the melt e-spinning process. The “Taylor cone” was formed on the surface of the broken polymer melt bubble, which was produced by an airflow. With the applied voltage ranging from 18 to 25 kV, the heating temperature was about 210–250 °C, and polyurethane (TPU) and polylactic acid (PLA) microfibers were successfully fabricated by this new melt e-spinning technique. During the melt e-spinning process, polymer melt jets ejected from the burst bubbles could be observed with a high-speed camera. Then, polymer microfibers could be obtained on the grounded collector. The fiber diameter ranged from 45 down to 5 μm. The results indicate that bubble melt e-spinning may be a promising method for needleless production in melt e-spinning.
Publisher: Trans Tech Publications, Ltd.
Date: 06-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.688.95
Abstract: In this paper, extraordinary self-assembled three-dimensional (3D) fibrous stackings have been fabricated by electrospinning from poly(vinylpyrrolidone)/nitrate solution and polystyrene solution. The stackings show cone-like shape, self-standing fiber arrays shape, or rockwork-like shape, which are quite different from the conventional electrospun 2D nonwoven mats. Especially, the stackings are able to reach to as high as 17 cm with the bottom diameter of 20 cm. In addition, it is found that the formation of the unique stackings is dependent on humidity, solution concentration/viscosity and volatility, which may strongly influence the solidification and stacking processes of the electrsopun fibers.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0MH01096K
Abstract: In the past 30 years, researchers have worked towards reducing the size of ordinary three-dimensional (3D) materials into 1D or 2D materials in order to obtain new properties and applications of these low-dimensional systems.
Publisher: IOP Publishing
Date: 13-04-2018
Publisher: AIP Publishing
Date: 22-03-2004
DOI: 10.1063/1.1688998
Publisher: Springer Science and Business Media LLC
Date: 14-03-2022
Publisher: MDPI AG
Date: 31-12-2020
Abstract: As the world faces water shortage and pollution crises, the development of novel visible light photocatalysts to purify water resources is urgently needed. Over the past decades, most of the reported photocatalysts have been in powder or granular forms, creating separation and recycling difficulties. To overcome these challenges, a flexible and recyclable heterostructured TiO2 olyvinylidene fluoride/graphitic carbon nitride (TiO2/PVDF/g-C3N4) composite was developed by combining electrospinning, sintering and hydrothermal methods. In the composite, PVDF was used as a support template for removing and separating the photocatalyst from solution. Compared with pure TiO2, the TiO2/PVDF/g-C3N4 composite exhibited the extended light capture range of TiO2 into the visible light region. The photogenerated carriers were efficiently transferred and separated at the contact interface between TiO2 and g-C3N4 under visible light irradiation, which consequently increased the photocatalytic activity of the photocatalyst. In addition, the flexible composites exhibited excellent self-cleaning properties, and the dye on the photocatalysts was completely degraded by the as-prepared materials. Based on the intrinsic low cost, recyclability, absorption of visible light, facile synthesis, self-cleaning properties and good photocatalytic performances of the composite, the photocatalyst is expected to be used for water treatment.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA04937D
Publisher: Elsevier BV
Date: 06-2021
Publisher: IEEE
Date: 11-2010
Publisher: American Physical Society (APS)
Date: 11-04-2005
Publisher: Wiley
Date: 11-12-2018
Abstract: On account of the high-cost of platinum, researchers are working to develop a new catalyst that is cheaper and has a catalytic effect equivalent to platinum. Herein, owing to the unique acetylenic bonds in graphdiyne, iron, nitrogen co-doped graphdiyne (Fe-N-GDY) is a promising nonprecious metal catalyst, which has been developed with just a small amount of iron precursor with the plan to substitute it for Pt-based catalysts. The as-synthesized Fe-N-GDY composited catalyst shows excellent catalytic performance with the onset potential of 0.94 V versus reversible hydrogen electrode and limited current density of 5.4 mA cm
Publisher: Hindawi Limited
Date: 2016
DOI: 10.1155/2016/9102828
Abstract: Conducting polyaniline (PANI) was in situ polymerized at the surface of electrospun poly(methyl methacrylate) (PMMA) fibers to obtain flexible composite fibers. The electrical conductivity of an in idual PANI/PMMA composite fiber was estimated to be 2.0 × 10 −1 S cm −1 at room temperature. The ammonia sensing properties of the s les were tested by impedance analysis. The PANI/PMMA fibers could obviously respond to low concentration of ammonia at ppb level and could respond to relatively high concentration of ammonia at 10 ppm level quickly. In addition, the sensitivity exhibited a good linear relationship to the ammonia concentration. Particularly, the flexible PANI/PMMA fibers showed a reversible change in electrical resistance with repeated cycles of bending and relaxing, and the electrical resistance decreased with the increase of curvature. These results indicate that the flexible PANI/PMMA composite fibers may be used in toxic ammonia gas detection, strain sensing, and flexible electronic devices.
Publisher: American Chemical Society (ACS)
Date: 12-10-2023
Publisher: Springer Science and Business Media LLC
Date: 28-01-2015
DOI: 10.1186/S11671-015-0734-5
Abstract: CdS is one of the important II-VI group semiconductors. In this paper, the electrical transport behavior of an in idual CdS microrope composed of twisted nanowires is studied. It is found that the current–voltage ( I - V ) characteristics show two distinct power law regions from 360 down to 60 K. Space-charge-limited current (SCLC) theory is used to explain these temperature- and electric-field-dependent I-V curves. The I-V data can be well fitted by this theory above 100 K, and the corresponding carrier mobility, trap energy, and trap concentration are also obtained. However, the I-V data exhibit some features of the Coulomb blockade effect below 80 K.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR05786H
Abstract: The side effects or toxicity of cyanoacrylate used in vivo have been argued since its first application in wound closure. We propose an airflow-assisted in situ precision electrospinning apparatus as an applicator and make a detailed comparison with traditional spraying via in vitro and in vivo experiments. This novel method can not only improve operational performance and safety by precisely depositing cyanoacrylate fibers onto a wound, but significantly reduce the dosage of cyanoacrylate by almost 80%. A white blood cell count, liver function test and histological analysis prove that the in situ precision electrospinning applicator produces a better postoperative outcome, e.g., minor hepatocyte injury, moderate inflammation and the significant ability for liver regeneration. This in situ precision electrospinning method may thus dramatically broaden both civilian and military applications of cyanoacrylates.
Publisher: Springer Science and Business Media LLC
Date: 08-11-2012
Publisher: Elsevier BV
Date: 04-2019
Publisher: MDPI AG
Date: 05-02-2022
Abstract: A simple and novel strategy of superhydrophilic-superhydrophobic Janus membrane was provided here to deal with the increasingly serious oil-water separation problem, which has a very bad impact on environmental pollution and resource recycling. The Janus membrane of cPVA-PVDF/PMMA/GO with opposite hydrophilic and hydrophobic properties was prepared by layer-by-layer electrospinning. The structure of the Janus membrane is as follows: firstly, the mixed solution of polyvinylidene fluoride (PVDF), polymethylmethacrylate (PMMA) and graphene oxide (GO) was electrospun to form a hydrophobic layer, then polyvinyl alcohol (PVA) nanofiber was coated onto the hydrophobic membrane by layer-by-layer electrospinning to form a composite membrane, and finally, the composite membrane was crosslinked to obtain a Janus membrane. The addition of GO can significantly improve the hydrophobicity, mechanical strength and stability of the Janus membrane. In addition, the prepared Janus membrane still maintained good oil-water separation performance and its separation efficiency almost did not decrease after many oil-water separation experiments. The flux in the process of oil-water separation can reach 1909.9 L m−2 h−1, and the separation efficiency can reach 99.9%. This not only proves the separation effect of the nanocomposite membrane, but also shows its high stability and recyclability. The asymmetric Janus membrane shows good oil-water selectivity, which gives Janus membrane broad application prospects in many fields.
Publisher: AIP Publishing
Date: 03-2003
DOI: 10.1063/1.1544653
Abstract: The temperature dependence of the resistivity of nanotubular polyaniline (PANI) doped with H3PO4 and β-naphthalene sulfonic acid (NSA) synthesized by a “template-free method” has been investigated. The molar ratios of H3PO4 (NSA) to aniline monomer (represented by H3PO4/An and NSA/An) of the s les are H3PO4/An=0.01, 0.05, 0.3, 0.5 and NSA/An=1, 2, respectively. It is found that ln ρ(T) is linear in T−1/2 and the resistivity is sensitive to the doping concentration. For NSA/An=1 s le, a crossover at 57 K in the plot of ln ρ(T)∼T−1/2 has been observed. On the basis of detailed analysis of the structure characteristics of the PANI nanotubes, we suggest a hopping–tunneling model to explain the experimental results.
Publisher: American Chemical Society (ACS)
Date: 15-12-2010
DOI: 10.1021/JP908847U
Abstract: This article exposes a facial approach to self-assemble polyaniline (PANI) nanowires with thin diameter (approximately 10 nm) and high room-temperature conductivity (approximately 10(0) S/cm) by using Fe(2)(SO(4))(3) as a binary oxidant and dopant. The new method not only saves hard templates and postprocess of template removal but also simplifies the reagent. Formation yield, diameter, and room-temperature conductivity of the nanowires are affected by the molar ratios of Fe(2)(SO(4))(3) to aniline. The low redox potential of Fe(2)(SO(4))(3) not only results in a thinner diameter and higher room-temperature conductivity (10(0) S/cm) of the nanowires but also shows a much weaker temperature dependence of resistivity and smaller characteristic Mott temperature (T(0) = 2.5 x 10(3) K).
Publisher: Wiley
Date: 19-06-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: MDPI AG
Date: 20-03-2020
Abstract: The exploration of a new family of flexible and high-performance electromagnetic shielding materials is of great significance to the next generation of intelligent electronic products. In this paper, we report a simple magnetic-electrospinning (MES) method for the preparation of a magnetic flexible film, γ-Fe2O3 nanoparticle-embedded polymeric nanofibers. By introducing the extra magnetic field force on γ-Fe2O3 nanoparticles within composite fibers, the critical voltage for spinning has been reduced, along with decreased fiber diameters. The MES fibers showed increased strength for the magnetic field alignment of the micro magnets, and the attraction between them assisted the increase in fiber strength. The MES fibers show modifications of the magnetic properties and electrical conductivity, thus leading to better electromagnetic shielding performance.
Publisher: American Chemical Society (ACS)
Date: 12-03-2015
Publisher: Springer Science and Business Media LLC
Date: 22-01-2021
Publisher: IOP Publishing
Date: 05-2011
Publisher: Elsevier BV
Date: 02-2018
Publisher: Trans Tech Publications, Ltd.
Date: 05-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.690-693.523
Abstract: A modified electrospinning setup with two-grounded-frame collector is proposed to fabricate aligned fiber arrays and fiber ropes. In this setup, two frames are placed under the spinneret, with the outer frame rotated with an electromotor and the inner frame hold still in a horizontal direction. Aligned nanofiber arrays can be collected rapidly on the inner frame. Influence of included angle and motor rotating speed on the arrays is discussed. In addition, through rotating one side of the inner frame, twisted fiber ropes with diameter 30~40 μm and length of 12 cm are obtained. Mechanical properties of the in idual nanofiber ropes are also measured and discussed.
Publisher: Springer Science and Business Media LLC
Date: 05-08-2022
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 12-2020
Publisher: IOP Publishing
Date: 07-2016
Publisher: Elsevier BV
Date: 12-2021
Publisher: Springer Science and Business Media LLC
Date: 15-09-2016
DOI: 10.1038/SREP33349
Abstract: Ferromagnetic resonance (FMR) in soft magnetic films (SMFs) to a large extent determines the maximum working frequency of magnetic devices. The FMR frequency ( f r ) in an optical mode is usually much higher than that in the corresponding acoustic mode for exchange coupled ferromagnet/nonmagnet/ferromagnet (FM/NM/FM) trilayers. In this study, we prepared a 50 nm FeCoB film with uniaxial magnetic anisotropy (UMA), showing a high acoustic mode f r of 4.17 GHz. When an ultrathin Ru spacer was inserted in the very middle of the UMA-FeCoB film, the zero-field FMR was abruptly switched from an acoustic mode to an optical one with f r dramatically enhanced from 4.17 GHz to 11.32 GHz. Furthermore, the FMR mode can be readily tuned to optical mode only, acoustic mode only, or double mode by simply varying the applied filed, which provides a flexible way to design multi-band microwave devices.
Publisher: Elsevier BV
Date: 12-2017
DOI: 10.20964/2017.12.09
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 03-2020
DOI: 10.1016/J.JHAZMAT.2019.121535
Abstract: Electrospinning technology has been used for a long time. A jet from a needle was formed by applying high voltage, and then the nanofibers are deposited onto a collecting electrode (usually metal) and the excess charge is conducted away to complete the electrospinning. Alternatively, it is also possible to prevent charge accumulation from hindering the progress of electrospinning by means of charge neutralization. A bipolar electrospinning technique (B-EEM) was developed to induce jets with different charges through a set of high-voltage power supplies of opposite polarity, and the two jets neutralize each other on the insulating mesh, thus completing the electrospinning process. There is no need for a collecting electrode to complete the electrospinning process. We have found that the filters produced by the new technology have better filtration efficiency while maintaining the same transparency in relative to the original technology, and this optimization is due to the distribution modification of the nanofibers on the mesh.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6PY01898J
Abstract: Electrospinning (e-spinning) has attracted tremendous attention because this technology provides a simple and versatile method for fabricating ultrafine fibers from a rich variety of materials including polymers, composites, and ceramics.
Publisher: Wiley
Date: 12-02-2021
Publisher: Elsevier BV
Date: 2021
Publisher: Wiley
Date: 28-06-2006
Abstract: One-dimensional gold olyaniline (Au/PANI-CSA) coaxial nanocables with an average diameter of 50-60 nm and lengths of more than 1 mum were successfully synthesized by reacting aniline monomer with chlorauric acid (HAuCl(4)) through a self-assembly process in the presence of D-c hor-10-sulfonic acid (CSA), which acts as both a dopant and surfactant. It was found that the formation probability and the size of the Au/PANI-CSA nanocables depends on the molar ratio of aniline to HAuCl(4) and the concentration of CSA, respectively. A synergistic growth mechanism was proposed to interpret the formation of the Au/PANI-CSA nanocables. The directly measured conductivity of a single gold olyaniline nanocable was found to be high (approximately 77.2 S cm(-1)). Hollow PANI-CSA nanotubes, with an average diameter of 50-60 nm, were also obtained successfully by dissolving the Au nanowire core of the Au/PANI-CSA nanocables.
Publisher: IOP Publishing
Date: 04-2011
Publisher: AIP Publishing
Date: 04-04-2005
DOI: 10.1063/1.1900950
Abstract: In this Letter, we report on the temperature-dependent conductivity and current-voltage curve of a single CdS nanowire, which was synthesized by a simple aqueous chemical growth method. A pair of platinum microleads was fabricated on the single CdS nanowire by focused ion-beam deposition. The room-temperature conductivity and the band gap of the single CdS wire are 0.82Ω−1cm−1 and 0.055eV, respectively. When the applied electric field is larger than 1090Vcm−1, the CdS nanowire shows a nonlinear I-V curve at room temperature.
Publisher: The Electrochemical Society
Date: 05-2023
Abstract: With the continuous development of science and technology, smart sensing wearables have gradually entered people’s lives. However, the prepared wearable material has poor air permeability, poor fit, and does not have multiple modal excitations. In addition, it is not waterproof or even wearable at low temperatures. In this work, a thermoplastic polyurethane (TPU) and ZnS:Al composite film with excellent air permeability has been developed. The TPU/ZnS:Al flexible film can be prepared on a large scale by solution blow spinning (SBS). This fiber membrane can realize the dual response of temperature and stress, and cooperate with the light sensor to realize the transmission of intelligent information. This nanofiber membrane doped with ZnS:Al exhibits a uniform distribution, maintains excellent tensile properties and flexibility, and can adapt to any perfect shape of the fitting surface. Even the average air permeability can be as high as 300 mm s −1 , which is 600 times that of conventional spraying methods. The Al introduced in ZnS:Al can stimulate the composite film to emit light, and the luminescence effect can be maintained for about 1 min. These results provide new ideas for the large-scale fabrication of integrated stimulus-responsive photosensitive intelligent wearable devices for various applications.
Publisher: Trans Tech Publications, Ltd.
Date: 06-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.688.74
Abstract: Ribbon-like microfibers of a new composite of europium complex Eu(aspirin) 3 (Phen) (aspirin is acetylsalicylic acid Phen represents 1,10-phenanthroline) and polystyrene (PS) were prepared successfully by electrospinning with different mass ratios of Eu(aspirin) 3 (Phen) complex to PS = 1:10, 1:40 and 1:160. The microfibers were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and fluorescence spectrophotometry. It was found that the fibers displayed excellent photoluminescence properties compared with rare-earth complex. The photoluminescence intensity and the emission intensity of the peak at 616 nm ( 5 D 0 → 7 F 2 ) of Eu-ions increased with the Eu(aspirin) 3 (Phen) loading. No obvious fluorescence quenching was observed. Further discussion on the structural and optical properties of the microribbons was presented. This kind of materials might be expected to be applied for optical or optoelectronic devices.
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 2024
Publisher: Elsevier BV
Date: 10-2019
Publisher: IOP Publishing
Date: 08-2010
Publisher: Elsevier BV
Date: 09-2023
Publisher: Elsevier BV
Date: 12-2018
Publisher: Wiley
Date: 28-02-2018
DOI: 10.1002/APP.46342
Publisher: American Chemical Society (ACS)
Date: 17-10-2006
DOI: 10.1021/JP062262E
Abstract: Magnetic susceptibility measurements on conducting polyaniline and polypyrrole nanostructures with different dopant type and doping level as functions of temperature and magnetic field are reported. The susceptibility data cannot be simply described as Curie-like susceptibility at lower temperatures and temperature-independent Pauli-like susceptibility at higher temperatures some unusual transitions are observed in the temperature dependence of susceptibility, for ex le, paramagnetic susceptibility decreases gradually with lowering temperature, which suggests the coexistence of polarons and spinless bipolarons and possible formation of bipolarons with changing temperature or doping level. In particular, it is found that the direct current magnetic susceptibilities are strongly dependent on applied magnetic field, dopant type, and doping level.
Publisher: Elsevier BV
Date: 02-2004
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TB00472A
Abstract: Recent advances in electrospun anisotropic architectures and porous structures, as well as their applications in tissue engineering, are presented.
Publisher: IOP Publishing
Date: 05-01-2015
DOI: 10.1088/0957-4484/26/4/045703
Abstract: Conducting polypyrrole (PPY) nanowires doped with p-toluene sulfonamide (PTSA) were synthesized by a template-free self-assembly method. Electrical transport characteristics, i.e. current-voltage (I-V) behavior, of an in idual PPY/PTSA nanowire have been explored in a wide temperature range from 300 down to 40 K. The fitting results of I-V curves indicated that the electrical conduction mechanism can be explained by the space-charge-limited current (SCLC) theory from 300 down to 100 K. In this temperature range, traps play an important role for this non-crystalline system. The corresponding trap energy and trap concentration have also been calculated based on the SCLC theory. Interestingly, there is no trap at 160 K, different from other temperatures. The obtained carrier mobility for the polymer nanowires is 0.964 cm(2) V(-1) s(-1) on the basis of trap free SCLC theory. In the temperature range of 80-40 K, little current can flow through the nanowire especially at lower voltages, however, the current follows the equation I ∞ (V/Vt-1)(ζ) at higher bias, which could be attributed to Coulomb blockade effect. Additionally, the differential conductance dI/dV curves also show some clear Coulomb oscillations.
Publisher: Research Square Platform LLC
Date: 13-01-2021
DOI: 10.21203/RS.3.RS-143392/V1
Abstract: Bacterial infection especially caused by multidrug-resistant bacteria still endangers human life. Photodynamic therapy (PDT) can effectively kill bacteria, and nanofiber-based PDT can effectively reduce damages to normal tissues. However, current photosensitizers coated on the surface of fibers would release to the wound causing some side effects. And nanofibers prepared by traditional method exhibiting poor adhesion on wound, which severely reduces the PDT effect due to its short-range effect. Herein, core-shell curcumin composite nanofibers are prepared by in-situ electrospinning method via a self-made portable electrospinning device. The obtained composite nanofibers show superior adhesiveness on different biological surface than that of traditional preparation method. Upon 808nm irradiation, these composite nanofibers effectively produced singlet oxygen ( 1 O 2 ) without curcumin fall off. After these composite nanofibers contaminated with drug-resistant bacteria, they exhibit dual antibacterial behaviors and efficiently kill the drug-resistant bacteria. These dual antibacterial nanofiber membranes with excellent adhesiveness may benefit the applications of wound infection as antibacterial dressing.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR11782G
Abstract: In this paper, we report a quick approach to self-assemble three-dimensional (3D) spongiform nanofiber stacks via electrospinning, which usually fabricates 2D non-woven fiber mats. Through controlling experimental conditions, cone-like polystyrene fiber stacks can be self-assembled on aluminum foil within 30 min. The stacks are able to reach a height of more than 10 cm. Moreover, conversion between the 3D fiber stack and 2D thin film can be controlled. The formation mechanism of the self-assembled fiber stacks and the influence of experimental conditions have also been explored. The 3D fiber stacks may be promising for applications in many fields such as tissue engineering, electrodes of battery, and filtration, etc.
Publisher: AIP Publishing
Date: 17-04-2006
DOI: 10.1063/1.2197929
Abstract: We report the measurements of conductivity, I-V curve, and magnetoresistance of a single Au olyaniline microfiber with a core-shell structure, on which a pair of platinum microleads was attached by focused ion beam. The Au olyaniline microfiber shows a much higher conductivity (∼110S∕cm at 300K) and a much weaker temperature dependence of resistance [R(4K)∕R(300K)=5.1] as compared with those of a single polyaniline microtube [σRT=30–40S∕cm and R(4K)∕R(300K)=16.2]. The power-law dependence of R(T)∝T−β, with β=0.38, indicates that the measured Au olyaniline microfiber is lying in the critical regime of the metal-insulator transition. In addition, the microfiber shows a H2 dependent positive magnetoresistance at 2, 4, and 6K.
Publisher: IOP Publishing
Date: 06-02-2004
Publisher: Wiley
Date: 13-01-2022
Abstract: The microstructure, elements distribution, and crystallinity of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3– δ (LSCF) and BaZr 0.8 Y 0.2 O 3– δ (BZY) nanofibers prepared by electrospinning method are systematically characterized. The electrochemical performance of the single cell with the cathode of nanofiber microstructure is tested by compared with the traditional powder materials. The results of electrochemical measurement manifest that the overall performance of the cells is improved greatly by the cathode with nanofibers. At the operating temperature of 700 °C, the peak power density is 1105 mW cm −2 and the polarization resistance is 0.041 Ω cm 2 , much better than the cells with powder cathode. The nanofiber cathode has excellent permeability and faster charge transfer rate due to its porous network structure, uniform diameter, and small grain size. Three‐phase boundaries and reaction rate in cathode are increased, and thus the stability and electrochemical performance of in idual cells are improved. This study not only expands the application of electrospinning in the field of energy, but also provides more methods to prepare high‐quality electrode materials for solid oxide fuel cells (SOFCs).
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TC00107A
Abstract: A review of recent advances in electrospun magnetic nanofibers and their applications
Publisher: Springer Science and Business Media LLC
Date: 27-03-2018
Publisher: Springer Science and Business Media LLC
Date: 23-09-2016
DOI: 10.1186/S11671-016-1646-8
Abstract: A facile method termed magneto-mechanical drawing is used to produce polymer composite microfibers. Compared with electrospinning and other fiber spinning methods, magneto-mechanical drawing uses magnetic force generated by a permanent magnet to draw droplets of polymer/magnetic nanoparticle suspensions, leading to fabrication of composite microfibers. In addition, because of the rotating collector, it is easy to control the fiber assembly such as fibrous array in parallel or crossed fibrous structure. The general applicability of this method has also been proved by spinning different polymers and magnetic nanoparticles. The resultant fibers exhibit good superparamagnetic behavior at room temperature and ultrahigh stretchability (~443.8 %). The results indicate that magneto-mechanical drawing is a promising technique to fabricate magnetic and stretchable microfibers and devices.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NR05292A
Abstract: Wireless piezoelectric devices based on electrospun PVDF/BaTiO 3 NW nanocomposite fibers have been fabricated for human motion monitoring and analysis.
Publisher: Hindawi Limited
Date: 07-09-2020
DOI: 10.1155/2020/8726407
Abstract: In order to improve the performance and endurance of steel rings used for twisting and winding yarns in the textile industry, a more wear-resistant ceramic version is studied and examined by conducting multiple simulations combined with microwave sintering experiments of the ring preparation process, aiming to reduce manufacturing costs and improve efficiency. The three-dimensional (3D) electromagnetic field simulation software HFSS is used to simulate the electromagnetic field distribution in the microwave sintering cavity and to determine the electromagnetic region with the most uniform electromagnetic field to guide the microwave sintering experiments. The 3Y-TZP ceramic rings are shaped by gel-casting. The effect of presintering on the performance of ceramic rings is investigated by applying conventional sintering and microwave sintering methods. The experimental results show that the simulation-guided microwave sintering process can resolve the deficiency of uneven microwave sintering at low temperatures. Comparing the final sintering temperatures and mechanical properties of the final ceramic-sintered rings obtained by microwave presintering to those obtained by conventional presintering, microwave presintered s le has a final temperature of 1400°C, which is 100°C lower than that of conventional presintering, which is 1500°C its average grain size of 0.18 μ m is dramatically smaller than that of conventional presintering, which is 0.24 μ m, with about 80% of the grain sizes present in the range of 0.1-0.2 μ m and a relative density of about 99%, as opposed to conventional presintering’s 70% falling between 0.2 and 0.3 μ m and relative density of about 98% the Vickers hardness and fracture toughness for microwave presintered s le reach 1550 kg·f·mm −2 and 9.05 MPa m 1/2 , respectively, which are both greater than 1431 kg·f·mm −2 and 8.86 MPa m 1/2 in the conventional s les.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR06060J
Abstract: A highly stretchable conductor, based on laminated nanocomposites, with robust electric conductivity and enhanced thermal management capability was demonstrated.
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 05-2020
Publisher: Springer Science and Business Media LLC
Date: 03-12-2015
DOI: 10.1038/SREP17768
Abstract: The extravasation of tumor cells is a key event in tumor metastasis. However, the mechanism underlying tumor cell extravasation remains unknown, mainly hindered by obstacles from the lack of complexity of biological tissues in conventional cell culture and the costliness and ethical issues of in vivo experiments. Thus, a cheap, time and labor saving and most of all, vascular microenvironment-mimicking research model is desirable. Herein, we report a microfluidic chip-based tumor extravasation research model which is capable of simultaneously simulating both mechanical and biochemical microenvironments of human vascular systems and analyzing their synergistic effects on the tumor extravasation. Under different mechanical conditions of the vascular system, the tumor cells (HeLa cells) had the highest viability and adhesion activity in the microenvironment of the capillary. The integrity of endothelial cells (ECs) monolayer was destroyed by tumor necrosis factor-α (TNF-α) in a hemodynamic background, which facilitated the tumor cell adhesion, this situation was recovered by the administration of platinum nanoparticles (Pt-NPs). This model bridges the gap between cell culture and animal experiments and is a promising platform for studying tumor behaviors in the vascular system.
Publisher: Springer Science and Business Media LLC
Date: 04-04-2019
Publisher: Hindawi Limited
Date: 23-01-2020
DOI: 10.1155/2020/3879040
Abstract: Separators are key materials to ensure the safety of lithium-ion batteries and improve their performance. Currently, commercial lithium-ion battery separators are mainly polyolefin organic diaphragms, but their temperature instability leads to battery short circuit and fire risk. A flexible SiO 2 nanofiber membrane combined with a poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) nanofiber membrane is prepared by an electrospinning method. The mechanical strength of the SiO 2 /PVDF-HFP composite nanofiber membrane (SPF) is twice as high as the pure SiO 2 nanofiber membrane and at 200°C, there are almost no dimensional changes of the SPF separators. Compared to commercial polyethylene (PE) separators, SPF shows excellent thermal stability and large-area closed cells at 180°C when used in lithium-ion battery separators. The porosity of SPF is 89.7%, which is more than twice than that of an ordinary PE separator. The liquid absorption rate of SPF is much higher than an ordinary PE separator and has reached 483%. Furthermore, the cycle and rate performance of lithium-ion batteries prepared by SPF has been improved significantly. These excellent properties, as well as the potential for large-scale production of electrospinning technology, make SPF an ideal choice for high-power battery separators.
Publisher: Wiley
Date: 17-07-2018
Publisher: American Chemical Society (ACS)
Date: 26-02-2019
Abstract: Because of its notable electrical and mechanical properties, the highly conductive graphene paper has great potential applications in future flexible electronics. In this study, we report a simple and effective method to prepare vertically aligned graphene oxide papers from graphene oxide suspensions by an improved electrospray deposition technique with a moving stage, which is controlled by computer. Then, the flexible reduced graphene oxide papers are successfully synthesized after reduction by using hydroiodic acid. The obtained reduced graphene oxide paper has an electrical conductivity as high as 6180 S/m, which is more than one and a half times of the reduced graphene oxide paper film, which was fabricated by using the electrospray deposition technique without the moving stage. The experimental results approved for the first time that the degree of alignment of reduced graphene oxide sheets can affect the conductivity of the reduced graphene oxide papers. Further electrochemical measurements for a symmetrical supercapacitor device based on the prepared reduced graphene oxide paper indicate that it has great capacitive performance and electrochemical stability. It exhibited relatively high specific capacitance (174 F·g
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CP07030F
Abstract: A giant spontaneous exchange bias of 1 T of samarium ferrite single crystals was obtained by tuning magnetic compensation by temperature.
Publisher: Springer Science and Business Media LLC
Date: 23-08-2019
Publisher: Elsevier BV
Date: 07-2016
DOI: 10.1016/J.MSEC.2016.03.107
Abstract: The scaffold microstructure is crucial to reconstruct tissue normal functions. In this article, poly(l-lactic acid) and chitosan fiber (PLLA/CTSF) composite scaffolds with hierarchical microstructures both in fiber and pore sizes were successfully fabricated by combining thermal induced phase separation and salt leaching techniques. The composite scaffolds consisted of a nanofibrous PLLA matrix with diameter of 50-500nm, and chitosan fibers with diameter of about 20μm were homogenously distributed in the PLLA matrix as a microsized reinforcer. The composite scaffolds also had high porosity (>94%) and hierarchical pore size, which were consisted of both micropores (50nm-10μm) and macropores (50-300μm). By tailoring the microstructure and chemical composition, the mechanical property, pH buffer and protein adsorption capacity of the composite scaffold were improved significantly compared with those of PLLA scaffold. Cell culture results also revealed that the PLLA/CTSF composite scaffolds supported MG-63 osteoblast proliferation and penetration.
Publisher: American Chemical Society (ACS)
Date: 10-09-2021
Abstract: At present, wearable electronic sensors are widely investigated and applied for human life usage especially for the flexible piezoelectric sensor based on piezoelectric fibers. However, most of these fiber-based piezoelectric sensors are thin films, which might had poor air permeability, or do not adapt to complex body movements. In this study, a piezoelectric sensing fabric was proposed based on core-spun Cu/P(VDF-TrFE) nanofibrous yarns. These yarns were fabricated by P(VDF-TrFE) as a piezoelectric material and Cu wire as an inner electrode layer through a one-step conjugate electrospinning process. The Cu/P(VDF-TrFE) fabrics showed good flexibility, breathability, mechanical stability, and sensing capability after continuous running for 60 min or after washing. A 4 cm × 4 cm fabric could generate a current of 38 nA and voltage of 2.7 V under 15 N pressure. Once the fabric was fixed onto the clothes, human motion could be monitored by collecting its generated current, and the signal could be wirelessly transmitted onto a smartphone. Therefore, this study may provide a simple and promising approach to design a smart textile for human motion monitoring.
Publisher: IOP Publishing
Date: 04-2008
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer Science and Business Media LLC
Date: 27-08-2022
Publisher: Elsevier BV
Date: 2023
DOI: 10.1016/J.JCIS.2022.09.051
Abstract: Burns are usually difficult to treat because their susceptibe to bacterial infections. When burns is accompanied by hyperthermia, the heat accumulated on the skin will causes extensive tissue damage. Most dressings focus on the treatment process, while ignoring the first-aid treatment to remove hyperthermia. To make matters worse, when outdoors, it is hard to find clean water to wash and cool the burned area. A dressing which can simultaneously realize first-time cooling and repairing treatment of the burned area can shorten treatment time, and is especially beneficial for outdoor use. In this study, a handheld coaxial electrospinning device is developed for preparing platelet-rich plasma @Polycaprolactone-epsilon polylysine (PRP@PCL/ε-PL) core-shell nanofibers. The nanofibers can be synchronously transformed into ice fibers during the spinning process, and directly deposited on the skin. The whole process is convenient to use outdoor. Via dual cooling mechanisms, first aid can take away the excessive heat in the burn area by nanofibers. These core-shell nanofibers also show its excellent antimicrobial and tissue regeneration-promoting properties. Therefore, it achieves first-time cooling and repair treatment of the burned area at the same time. Moreover, due to direct in-situ deposition of this handheld coaxial electrospinning, better antimicrobial properties, and faster healing performance are achieved. By using this integrated strategy that combines cooling, antibacterial and healing promotion, the burn recovery time is shortened from 21 days to 14 days.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NA00535B
Abstract: Fish scale/sodium alginate/chitosan nanofiber hydrogels for wound healing.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR06341J
Abstract: An acid- and alkali-resistant TENG based on a superhydrophobic sintered PVA–PTFE composite membrane.
Publisher: Springer Science and Business Media LLC
Date: 20-04-2019
Publisher: American Chemical Society (ACS)
Date: 06-11-2020
Publisher: The Optical Society
Date: 10-10-2014
DOI: 10.1364/OME.4.002300
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 11-2021
Publisher: American Chemical Society (ACS)
Date: 13-05-2020
Publisher: Trans Tech Publications, Ltd.
Date: 2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.650.200
Abstract: Gold-poly (3,4-ethylenedioxythiophene) (Au-PEDOT) nanowires with Au nanoparticles embedded in the polymer matrix and polyvinylpyrrolidone (PVP) modified Au-PEDOT coaxial nanocables with a core-shell structure have been synthesized by a new and facile self-assembly method. The morphology and structure features of the composites were characterized by transmission electron microscopy, selected-area electron diffraction, and energy-dispersive x-ray spectrometry. The room-temperature electrical conductivity of the casted composite films was about 0.21 S/cm. Photoresponse of the films were also investigated with respect to wide potential applications of the multifunctional composites. Clear photocurrent switching characteristic during switching on/off of a xenon l was observed.
Publisher: MDPI AG
Date: 16-10-2018
DOI: 10.3390/NANO8100842
Abstract: To meet the urgent need of society for advanced photocatalytic materials, novel visible light driven heterostructured composite was constructed based on graphitic carbon nitride (g-C3N4) and fibrous TiO2. The g-C3N4/TiO2 (CNT) composite was prepared through electrospinning technology and followed calcination process. The state of the g-C3N4 and fibrous TiO2 was tightly coupled. The photocatalytic performance was measured by degrading the Rhodamine B. Compared to commercial TiO2 (P25®) and electrospun TiO2 nanofibers, the photocatalytic performance of CNT composite was higher than them. The formation of CNT heterostructures and the enlarged specific surface area enhanced the photocatalytic performance, suppressing the recombination rate of photogenerated carriers while broadening the absorption range of light spectrum. Our studies have demonstrated that heterostructured CNT composite with an appropriate proportion can rational use of visible light and can significantly promote the photogenerated charges transferred at the contact interface between g-C3N4 and TiO2.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR30437F
Abstract: As the demand for renewable energy resource is growing rapidly worldwide, a variety of energy materials and technologies are being developed. In this review, we aim to summarize recent developments in the state-of-the-art research on energy harvesting technologies such as thin-film Si or Ge, CdTe, GaAs, organic, hybrid, and dye-sensitized solar cells (DSSCs) utilizing one-dimensional (1D) nanomaterials, mainly semiconductor nanowires, nanocones, nanotubes and nanofibers, which are prepared by vapor-liquid-solid method, colloidal lithography, template-guided growth, or electrospinning. Moreover, the future challenges (such as efficiency improvement and natural resource limitations) and prospects of nanostructured solar cells are proposed.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR02922H
Abstract: A battery-operated handheld electrospinning apparatus with high safety, good performance and promising application.
Publisher: MDPI AG
Date: 05-02-2020
Abstract: Stretchable nano-fibers have attracted dramatic attention for the utility in wearable and flexible electronics. In the present case, Ag nanowires (AgNWs)-intertwined thermoplastic polyurethanes (TPU) unwoven nano-membrane is fabricated by an electrospinning method and dip coating technique. Then a strain sensor with a spring-like configuration is fabricated by a twisted method. The sensor exhibits superior electrical conductivity up to 3990 S·cm−1 due to the high weight percentage of the Ag nanowires. Additionally, thanks to the free-standing spring-like configuration that consists of uniform neat loops, the strain sensor can detect a superior strain up to 900% at the point the sensor ruptures. On the other hand, the configuration can mostly protect the AgNWs from falling off. Furthermore, major human motion detection, like movement of a human forefinger, and minor human motion detection, such as a wrist pulse, show the possible application of the sensor in the field of flexible electronics.
Publisher: Elsevier BV
Date: 02-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 10-09-2014
DOI: 10.1039/C4RA07943D
Publisher: IOP Publishing
Date: 2009
Publisher: Elsevier BV
Date: 12-2020
Publisher: Trans Tech Publications, Ltd.
Date: 09-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.807-809.2679
Abstract: In this paper, a novel fluorescent material with high conductivity as 0.45 S·cm -1 and strong fluorescence has been successfully synthesized basing on polyaniline (PANI) nanostructures doped with a new prepared fluorescein TPABTDBN. The PANI nanostructures were prepared via a simplified template-free method (STFM) with FeCl 3 as oxidant and dopant. The resulting s le was characterized by SEM, IR and fluorescence spectroscopy. The fluorescence intensity of synthesized composite improves with the increasing content of TPABTDBN. The electrical properties of pressed composite pellets were measured from room temperature about 291K down to 132K, the conductance follow the exponential temperature dependence of three-dimensional variable-range hopping (VRH) model.
Publisher: IOP Publishing
Date: 28-10-2014
Publisher: American Chemical Society (ACS)
Date: 27-06-2013
DOI: 10.1021/AM401937M
Abstract: In this work, we fabricated polymeric fibrous scaffolds for bone tissue engineering using primary human osteoblasts (HOB) as the model cell. By employing one simple approach, electrospinning, we produced poly(lactic-co-glycolic acid) (PLGA) scaffolds with different topographies including microspheres, beaded fibers, and uniform fibers, as well as the PLGA/nanohydroxyapatite (nano-HA) composite scaffold. The bone-bonding ability of electrospun scaffolds was investigated by using simulated body fluid (SBF) solution, and the nano-HA in PLGA/nano-HA composite scaffold can significantly enhance the formation of the bonelike apatites. Furthermore, we carried out in vitro experiments to test the performance of electrospun scaffolds by utilizing both mouse preosteoblast cell line (MC 3T3 E1) and HOB. Results including cell viability, alkaline phosphatase (ALP) activity, and osteocalcin concentration demonstrated that the PLGA/nano-HA fibers can promote the proliferation of HOB efficiently, indicating that it is a promising scaffold for human bone repair.
Publisher: Springer Science and Business Media LLC
Date: 09-07-2022
Publisher: IOP Publishing
Date: 21-06-2018
Publisher: American Chemical Society (ACS)
Date: 05-09-2022
Publisher: Wiley
Date: 23-10-2003
Publisher: Hindawi Limited
Date: 06-04-2020
DOI: 10.1155/2020/4965438
Abstract: There are still some challenges for mass-scale production via electrospinning (e-spinning). For ex le, the cost of industrialized equipment is relatively expensive, and the subsequent maintenance costs are high. The reliability and stability of the production process are also one of the important challenges. The recycling of organic solvents and the volatilization of solvents not only affect the quality of nanofibers, but also causes environmental pollution. In this work, a new multineedle e-spinning device has been proposed for large-scale production of polymer nanofibers. The spinning solution is provided through the outside surface of the needle to avoid needle clogging problem, which is different from the traditional multineedle e-spinning. The successful preparation of thermoplastic polyurethane (TPU) nanofiber membrane with production rate ~50 g h -1 proves the feasibility of the device, which also can be used to prepare other functional nanofibers such as polyvinylidene fluoride (PVDF) and polyacrylonitrile (PAN). The prepared TPU nanofiber gauze has been characterized. The average fiber diameter was 145.3 nm. The surface of the s le was found to be uniform, and the water contact angle was 138.9°. The s le had gas permeability of 1500 mm s -1 , excellent PM2.5 removal efficiency of 99.897%, and optical transparency of ~56%, indicating that the new device has a practical application perspective.
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 06-2005
Publisher: Informa UK Limited
Date: 17-04-2008
Publisher: Hindawi Limited
Date: 2016
DOI: 10.1155/2016/5164012
Abstract: An ultralight conducting polyaniline/SiC olyacrylonitrile (PANI/SiC/PAN) composite was fabricated by in situ polymerization of aniline monomer on the surface of fibers in SiC/PAN aerogel. The SiC/PAN aerogel was obtained by electrospinning, freeze-drying, and heat treatment. The ingredient, morphology, structure, and electrical properties of the aerogel before and after in situ polymerization were investigated by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and voltage-current characteristic measurement. The thermostability of PANI/SiC/PAN composite was investigated by thermogravimetric analysis (TGA) and electrical resistance measured at different temperatures. The density of the PANI/SiC/PAN composite was approximately 0.211 g cm −3 , the porosity was 76.44%, and the conductivity was 0.013 S m −1 . The pressure sensing properties were evaluated at room temperature. The electrical resistance of as-prepared s le decreased gradually with the increase of pressure. Furthermore, the pressure sensing process was reversible and the response time was short (about 1 s). This composite may have application in pressure sensor field.
Publisher: Inderscience Publishers
Date: 2008
Publisher: American Chemical Society (ACS)
Date: 21-05-2018
Abstract: Alginate nanofibers assembled with silver nanoparticles throughout the whole nanofiber were fabricated by three steps including electrospinning of Na-alginate nanofibers, ion exchange between the sodium and silver ions, and in situ reduction of silver nanoparticles. The content, distribution, and size of the nanoparticles are controllable by tuning reaction conditions. Ag/alginate nanofibers exhibit good humidity sensitivity in a wide humidity range from 20% ambient relative humidity (RH) to 85% RH. Interestingly, these humidity sensors can be attached to a 3M-9001V mask for monitoring human breath during exercise and emotion changes, and this smart mask exhibits accurate and continuous human breath tracking, no matter how fast or slow as well as how deep or shallow is the human breathing. The obtained frequencies of respiration during normal, running, delight, and sadness conditions were 16, 13, 14, and 8 times per minute, respectively. Moreover, the signal waveform obtained under emotion changes is distinguishable, implying its potential applications in lie detection and interrogation. Thanks to this smart mask, it could accurately capture the rate and depth of respiration, providing an effective, low-cost, and convenient approach for tracking respiration, and it was utilized as smart fabrics in avoiding sleep apnea.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6RA26931A
Abstract: The aligned LBL scaffold promoted host vessel infiltration into the scaffolds and integration with in vitro prefabricated vascular structures.
Publisher: Informa UK Limited
Date: 07-2014
Publisher: American Chemical Society (ACS)
Date: 09-08-2021
DOI: 10.1021/JACS.1C06115
Publisher: MDPI AG
Date: 02-05-2019
Abstract: Paper-based relics, which are an important part of cultural heritage worldwide, are at risk of imminent damage from various environmental sources. To protect them, the atmospheric pressure plasma polymerization of hexamethyldisiloxane (HMDSO) precursor has been explored on paper-based relics in situ. The macro and micro images taken during this process suggest that the in situ plasma treatment does not change the macro morphology and the micro structure of the treated paper-based relic s les. On the other hand, plasma treatment causes the polymerization of the HMDSO which then produces nanoparticles deposited onto the paper-based relics. These nanoparticles provide good waterproof properties with large static water contact angles and smaller rolling angles, which protect the paper-based relics from water penetration. Moreover, since the nanoparticles are deposited onto the fibers, waterproof fastness is ensured. Also, the examined mechanical properties of the treated and untreated paper-based relics indicate that the atmospheric pressure plasma treatment does not affect the strength of the paper very much. The results in this study show that atmospheric pressure plasma treatment with the use of HMDSO precursor is a good method to preserve paper-based relics.
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM12240A
Publisher: Elsevier BV
Date: 09-2021
Publisher: Springer Science and Business Media LLC
Date: 19-04-2022
Publisher: IOP Publishing
Date: 12-10-2017
Abstract: Flexible electronic skin has stimulated significant interest due to its widespread applications in the fields of human-machine interactivity, smart robots and health monitoring. As typical elements of electrical skin, the fabrication process of most pressure sensors combined nanomaterials and PDMS films are redundant, expensive and complicated, and their unknown biological toxicity could not be widely used in electronic skin. Hence, we report a novel, cost-effective and antibacterial approach to immobilizing silver nanoparticles into-electrospun Na-alginate nanofibers. Due to the unique role of carboxyl and hydroxyl groups in Na-alginate, the silver nanopaticles with 30 nm size in diameter were uniformly distributed inside and outside the alginate nanofibers, which obtained pressure sensor shows stable response, including an ultralow detection limited (1 pa) and high durability (>1000 cycles). Notably, the pressure sensor fabricated by these Ag/alginate nanofibers could not only follow human respiration but also accurately distinguish words like 'Nano' and 'Perfect' spoke by a tester. Interestingly, the pixelated sensor arrays based on these Ag/alginate nanofibers could monitor distribution of objects and reflect their weight by measuring the different current values. Moreover, these Ag/alginate nanofibers exhibit great antibacterial activity, implying the great potential application in artificial electronic skin.
Publisher: Elsevier BV
Date: 10-2022
DOI: 10.1016/J.JHAZMAT.2022.129790
Abstract: Oil leakage has posed serious threat to the environment, but still remain a great challenge to be solved especially for harsh environmental conditions. Herein, robust superhydrophobic nickel hydroxide grown by hydrothermal method and stearic acid modification on a blow-spun polyacrylonitrile (PAN)/Al
Publisher: Trans Tech Publications, Ltd.
Date: 11-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.687-691.4218
Abstract: Aligned poly (vinylidene fluoride) (PVDF) nanofibers and the nanoropes have been fabricated via a novel electrospinning technique. And then conducting polyaniline (PANI) was coated on the surfaces of the nanoropes using an in situ chemical oxidative polymerization method. It is found that the conductivity increased drastically at first and then tended to be saturation in the polymerization process. In addition, the flexibility and stretchability of the composites have been measured: With an increase of bending curvature and tensile strain, the conductivity rose at the beginning because the fibers among the nanoropes get tight and then the conductivity dropped, which may due to the PANI layer broke and becomes discontinuous with the adding stress.
Publisher: AIP Publishing
Date: 19-12-2016
DOI: 10.1063/1.4972962
Abstract: We proposed a nanocomposite barrier CoO-ZnO for magnetism manipulation in Co/CoO-ZnO/Ag heterojunctions. Both electrical control of magnetism and resistive switching were realized in this junction. An electrical tunable exchange bias of CoO1-v (v denotes O vacancies) on Co films was realized using voltages below 1 volt. The magnetism modulation associated with resistive switching can be attributed to the oxygen ions migration between the insulating CoO1-v layer and the semiconductive ZnO1-v layer, which can cause both ferromagnetic phase and resistance switching of CoO1-v layer.
Publisher: Springer Science and Business Media LLC
Date: 23-08-2018
DOI: 10.1038/S41467-018-05878-Y
Abstract: Doping with pyridinic nitrogen atoms is known as an effective strategy to improve the activity of carbon-based catalysts for the oxygen reduction reaction. However, pyridinic nitrogen atoms prefer to occupy at the edge or defect sites of carbon materials. Here, a carbon framework named as hydrogen-substituted graphdiyne provides a suitable carbon matrix for pyridinic nitrogen doping. In hydrogen-substituted graphdiyne, three of the carbon atoms in a benzene ring are bonded to hydrogen and serve as active sites, like the edge or defect positions of conventional carbon materials, on which pyridinic nitrogen can be selectively doped. The as-synthesized pyridinic nitrogen-doped hydrogen-substituted graphdiyne shows much better electrocatalytic performance for the oxygen reduction reaction than that of the commercial platinum-based catalyst in alkaline media and comparable activity in acidic media. Density functional theory calculations demonstrate that the pyridinic nitrogen-doped hydrogen-substituted graphdiyne is more effective than pyridinic nitrogen-doped graphene for oxygen reduction.
Publisher: IOP Publishing
Date: 10-03-2020
Publisher: AIP Publishing
Date: 09-10-2023
DOI: 10.1063/5.0169224
Publisher: IOP Publishing
Date: 14-08-2004
Publisher: Elsevier BV
Date: 09-2019
Publisher: Springer Science and Business Media LLC
Date: 12-2019
DOI: 10.1186/S11671-019-3199-0
Abstract: Fine particulate matter (PM) has seriously affected human life, such as affecting human health, climate, and ecological environment. Recently, many researchers use electrospinning to prepare nanofiber air filters for effective removal of fine particle matter. However, electrospinning of the polymer fibers onto the window screen uniformly is only achieved in the laboratory, and the realization of industrialization is still very challenging. Here, we report an electrospinning method using a rotating bead spinneret for large-scale electrospinning of thermoplastic polyurethane (TPU) onto conductive mesh with high productivity of 1000 m 2 /day. By changing the concentration of TPU in the polymer solution, PM2.5 removal efficiency of nanofiber-based air filter can be up to 99.654% with good optical transparency of 60%, and the contact angle and the ventilation rate of the nanofiber-based air filter is 128.5° and 3480 mm/s, respectively. After 10 times of filtration, the removal efficiency is only reduced by 1.6%. This transparent air filter based on TPU nanofibers has excellent filtration efficiency and ventilation rate, which can effectively ensure indoor air quality of the residential buildings.
Publisher: Elsevier BV
Date: 07-2014
Publisher: Elsevier BV
Date: 04-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TA14102K
Publisher: Elsevier BV
Date: 2018
DOI: 10.1016/J.IJBIOMAC.2017.08.072
Abstract: The pure chitosan nanofibrous membranes with average fiber diameter of 86±18, 114±17,164±28nm were successfully prepared by electrospinning. Batch adsorption experiments of using chitosan nanofibrous membranes as adsorbent to remove acid blue-113 were conducted. The adsorption capacity of 1377mg/g was achieved by the chitosan nanofibrous membrane with average fiber diameter of 86nm, which was superior to the chitosan microscale s le with the adsorption capacity of 412mg/g. The average fiber diameter and the corresponding equilibrium adsorption capacity of pure chitosan nanofibrous membranes fitted well with linear relationship in our test range. The results also showed that the adsorption followed with pseudo second-order kinetics model, and the adsorption behavior was accordance with the Langmuir isotherm model. The pure chitosan nanofibrous membrane showed promise and feasibility as an effective adsorbent for dye removal.
Publisher: Springer Science and Business Media LLC
Date: 13-11-2010
DOI: 10.1007/S11671-009-9471-Y
Abstract: Two- and four-probe electrical measurements on in idual conjugated polymer nanowires with different diameters ranging from 20 to 190 nm have been performed to study their conductivity and nanocontact resistance. The two-probe results reveal that all the measured polymer nanowires with different diameters are semiconducting. However, the four-probe results show that the measured polymer nanowires with diameters of 190, 95–100, 35–40 and 20–25 nm are lying in the insulating, critical, metallic and insulting regimes of metal–insulator transition, respectively. The 35–40 nm nanowire displays a metal–insulator transition at around 35 K. In addition, it was found that the nanocontact resistance is in the magnitude of 10 4 Ω at room temperature, which is comparable to the intrinsic resistance of the nanowires. These results demonstrate that four-probe electrical measurement is necessary to explore the intrinsic electronic transport properties of isolated nanowires, especially in the case of metallic nanowires, because the metallic nature of the measured nanowires may be coved by the nanocontact resistance that cannot be excluded by a two-probe technique.
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B9NR00212J
Abstract: Epoxy in electrospun nanofibers acting as adhesive generates junctions between nanofibers and thus forms stable three-dimensional networks.
Publisher: Trans Tech Publications, Ltd.
Date: 08-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.562-564.799
Abstract: LiMn 2 O 4 nanofibers were prepared via electrospinning and followed by calcination. The surface morphology of as-spun and pure LiMn 2 O 4 nanofibers was characterized by a scanning electron microscope (SEM) with an average diameter of 180 nm. After calcination at 800 °C in air for 5 h, charge/discharge capacity of pure LiMn 2 O 4 nanofibers was measured in the potential range of 3.0 to 4.3 V. Battery testing showed that LiMn2O4 have a high discharge capacity of 80 mAh/g and 85% of the initial charge capacity was maintained for 5 cycles.
Publisher: Elsevier BV
Date: 04-2020
DOI: 10.1016/J.COLSURFB.2019.110766
Abstract: Antibacterial dressings are an increasingly important tool for the prevention and management of wound infections, particularly in light of concerns surrounding conventional drug-resistant antibiotics. Handheld electrospinning devices provide opportunities for the rapid application of antibacterial dressing materials to wounds, but spinning formulations need to be compatible with live biological surfaces. We report the development of a new antibacterial formulation compatible with handheld electrospinning, and its manufacture directly on a wound site. Nanofibrous dressing mats were produced from polyvinyl pyrrolidone (PVP) containing isatis root (Indigowoad root or Ban-Lan-Gen), a traditional Chinese medicine, commonly used for the treatment of infectious disease. The resulting wound dressing mats of PVP/isatis root exhibited well-defined fibrous structures and excellent surface wetting, and permeability characteristics. The presence of isatis root conferred antibacterial activity against gram negative and gram positive strains. Moreover, in a Kunming mouse skin injury model, direct electrospinning of PVP/isatis root formulations on to wound sites produced near complete wound closure after 11 days and epidermal repair in histological studies.
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 06-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TC31680G
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 04-2003
Publisher: Springer Science and Business Media LLC
Date: 28-10-2021
Publisher: MDPI AG
Date: 18-06-2019
DOI: 10.3390/APP9122489
Abstract: Along with the development of industry and the improvement of people’s living standards, peoples’ demand on resources has greatly increased, causing energy crises and environmental pollution. In recent years, photocatalytic technology has shown great potential as a low-cost, environmentally-friendly, and sustainable technology, and it has become a hot research topic. However, current photocatalytic technology cannot meet industrial requirements. The biggest challenge in the industrialization of photocatalyst technology is the development of an ideal photocatalyst, which should possess four features, including a high photocatalytic efficiency, a large specific surface area, a full utilization of sunlight, and recyclability. In this review, starting from the photocatalytic reaction mechanism and the preparation of the photocatalyst, we review the classification of current photocatalysts and the methods for improving photocatalytic performance we also further discuss the potential industrial usage of photocatalytic technology. This review also aims to provide basic and comprehensive information on the industrialization of photocatalysis technology.
Publisher: Trans Tech Publications, Ltd.
Date: 06-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.688.250
Abstract: Curled polyvinylpyrrolidone (PVP) microfibers were prepared successfully with a modified electrospinning setup in which the commonly used collector, a piece of aluminum foil was replaced by a steel nail (a tip collector). PVP (45 wt %) ethanol solution was used.with the increase of voltage, the proportion of the curled fibers increased and the uniformity of the curled fibers improved, also the repeat distance (wavelength) of the curled structures became smaller. In addition, some curled fibers developed into helical structures under relatively high voltages. Further analyses suggest that the mechanism for the curled PVP fibers could be ascribed to electric driven bending instability and/or mechanical jet buckling when hitting the hard collector surface.
Publisher: Springer Science and Business Media LLC
Date: 10-2009
Abstract: In order to study the electronic properties of conjugated polymer nanowire junctions, we have fabricated two devices consisting of two crossed poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires with platinum microleads attached to each end of each nanowire. We find that the junction resistance of the crossed nanowires is much larger than the intrinsic resistance of the in idual PEDOT nanowire, and increases with decreasing temperature, which can be described by a thermal fluctuation-induced tunneling conduction model. In addition, the crossed junctions show linear current-voltage characteristics at room temperature.
Publisher: American Chemical Society (ACS)
Date: 07-03-2012
DOI: 10.1021/NN204848R
Abstract: High-performance flexible electronics has attracted much attention in recent years due to potential applications in flexible displays, artificial skin, radio frequency identification, sensor tapes, etc. Various materials such as organic and inorganic semiconductor nanowires, carbon nanotubes, graphene, etc. have been explored as the active semiconductor components for flexible devices. Among them, inorganic semiconductor nanowires are considered as highly promising materials due to their relatively high carrier mobility, reliable control on geometry and electronic properties, and cost-effective synthesis processes. In this review, recent progress on the assembly of high-performance inorganic semiconductor nanowires and their applications for large-scale flexible electronics will be summarized. In particular, nanowire-based integrated circuitry and high-frequency electronics will be highlighted.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 04-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CP00648C
Abstract: The exciton dynamics in one-dimensional stacked PBI (Perylene Bisimide) aggregates was studied with SQC-MM dynamics (Symmetrical Quasiclassical Dynamics based on the Meyer–Miller mapping Hamiltonian).
Publisher: Informa UK Limited
Date: 08-2016
DOI: 10.2147/IJN.S113560
Publisher: IOP Publishing
Date: 07-2004
Publisher: Elsevier BV
Date: 04-2022
Publisher: MDPI AG
Date: 14-03-2019
DOI: 10.3390/NANO9030431
Abstract: Novel flexible and recyclable core-shell heterostructured fibers based on cauliflower-like MoS2 and TiO2/PVDF fibers have been designed through one-step hydrothermal treatment based on electrospun tetrabutyl orthotitanate (TBOT)/PVDF fibers. The low hydrothermal temperature avoids the high temperature process and keeps the flexibility of the as-synthesized materials. The formation mechanism of the resultant product is discussed in detail. The composite of MoS2 not only expands the light harvesting window to include visible light, but also increases the separation efficiency of photo-generated electrons and holes. The as-prepared product has proven to possess excellent and stable photocatalytic activity in the degradation of Rhodamine B and levofloxacin hydrochloride under visible light irradiation. In addition, the TiO2/PVDF@MoS2 core-shell heterostructured fibers exhibit self-cleaning property to dye droplets under visible light irradiation. Meanwhile, due to its hydrophobicity, the resultant product can automatically remove dust on its surface under the rolling condition of droplets. Hence, the as-prepared product cannot only degrade the contaminated compounds on the surface of the material, but also reduce the maintenance cost of the material due to its self-cleaning performance. Therefore, the as-prepared product possesses potential applications in degradation of organic pollutants and water treatment, which makes it a prospective material in the field of environmental treatment.
Publisher: American Chemical Society (ACS)
Date: 10-03-2023
Publisher: IOP Publishing
Date: 18-03-2003
Publisher: Springer Science and Business Media LLC
Date: 25-02-2021
Publisher: Elsevier BV
Date: 2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA05894A
Abstract: Elastico-mechanoluminescence (EML) of diphase (Ba,Ca)TiO 3 :Pr 3+ ,RE (RE includes all rare-earth-ions except Sc and Pm) is systematically investigated.
Publisher: Hindawi Limited
Date: 2016
DOI: 10.1155/2016/3021353
Abstract: Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) olyvinylpyrrolidone (PEDOT:PSS/PVP) composite nanofibers were successfully fabricated via electrospinning and used as a quartz crystal microbalance (QCM) sensor for detecting CO gas. The electrical property of in idual PEDOT:PSS/PVP nanofibers was characterized and the room temperature resistivity was at the magnitude of 10 5 Ω·m. The QCM sensor based on PEDOT:PSS/PVP nanofibers was sensitive to low concentration (5–50 ppm) CO. In the range of 5–50 ppm CO, the relationship between the response of PEDOT:PSS nanofibers and the CO concentration was linear. Nevertheless, when the concentration exceeded 50 ppm, the adsorption of the nanofiber membrane for CO gas reached saturation and the resonant frequency range had no change. Therefore, the results open an approach to create electrospun PEDOT:PSS/PVP for gas sensing applications.
Publisher: Springer Science and Business Media LLC
Date: 11-01-2022
Publisher: Elsevier BV
Date: 07-2023
Publisher: American Chemical Society (ACS)
Date: 14-09-2017
Abstract: Hypertrophic scarring (HS) is a disorder that occurs during wound healing and seriously depresses the quality of human life. Scar-inhibiting scaffolds, though bringing promise to HS prevention, face problems such as the incompatibility of the scaffold materials and the instability of bioactive molecules. Herein, we present a TGF-β1-inhibitor-doped poly(ε-caprolactone) (PCL)/gelatin (PG) coelectrospun nanofibrous scaffold (PGT) for HS prevention during wound healing. The appropriate ratio of PCL to gelatin can avoid in idual defects of the two materials and achieve an optimized mechanical property and biocompatibility. The TGF-β1 inhibitor (SB-525334) is a small molecule and is highly stable during electrospinning and drug release processes. The PGT effectively inhibits fibroblast (the major cell type contributing to scar formation) proliferation in vitro and successfully prevents HS formation during the healing of full-thickness model wounds on rabbit ear. Our strategy offers an excellent solution for potential large-scale production of scaffolds for clinical HS prevention.
Publisher: Tsinghua University Press
Date: 20-04-2022
DOI: 10.1007/S40145-022-0567-5
Abstract: Magnetic materials are of increasing importance for many essential applications due to their unique magnetic properties. However, due to the limited fabrication ability, magnetic materials are restricted by simple geometric shapes. Three-dimensional (3D) printing is a highly versatile technique that can be utilized for constructing magnetic materials. The shape flexibility of magnets unleashes opportunities for magnetic composites with reducing post-manufacturing costs, motivating the review on 3D printing of magnetic materials. This paper focuses on recent achievements of magnetic materials using 3D printing technologies, followed by the characterization of their magnetic properties, which are further enhanced by modification. Interestingly, the corresponding properties depend on the intrinsic nature of starting materials, 3D printing processing parameters, and the optimized structural design. More emphasis is placed on the functional applications of 3D-printed magnetic materials in different fields. Lastly, the current challenges and future opportunities are also addressed.
Publisher: Elsevier BV
Date: 10-2018
Publisher: MDPI AG
Date: 14-01-2020
DOI: 10.3390/APP10020596
Abstract: We report the fabrication of polyvinylidene fluoride (tetrabutyl titanate) olyvinyl pyrrolidone ((tetrabutyl titanate))-graphene quantum dots [PVDF(TBT)/PVP(TBT)-GQDs] film photocatalyst with enhanced photocatalytic performance. The polyvinylidene fluoride (tetrabutyl titanate) olyvinyl pyrrolidone ((tetrabutyl titanate)) [PVDF(TBT)/PVP(TBT)] film was first prepared with a dual-electrospinning method and then followed by attaching graphene quantum dots (GQDs) to the surface of the composite film through a hydrothermal method. Later, part of the PVP in the composite film was dissolved by a hydrothermal method. As a result, a PVDF(TBT)/PVP(TBT)-GQDs film photocatalyst with a larger specific surface area was achieved. The photocatalytic degradation behavior of the PVDF(TBT)/PVP(TBT)-GQDs film photocatalyst was examined by using Rhodamine B as the target contaminant. The PVDF(TBT)/PVP(TBT)-GQDs photocatalyst showed a higher photocatalytic efficiency than PVDF(TBT)-H2O, PVDF(TBT)/PVP(TBT)-H2O, and PVDF(TBT)-GQDs, respectively. The enhanced photocatalytic efficiency can be attributed to the broader optical response range of the PVDF(TBT)/PVP(TBT)-GQDs photocatalyst, which makes it useful as an effective photocatalyst under white light irradiation.
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 2021
Publisher: American Chemical Society (ACS)
Date: 30-03-2018
Publisher: Elsevier BV
Date: 05-2020
Publisher: Springer Science and Business Media LLC
Date: 05-08-2022
Publisher: IOP Publishing
Date: 09-11-2021
Abstract: Superconducting nanofibers have attracted much attention in basic researches and practical applications due to their unique physical properties such as broad phase transition temperature, excellent heat conductivity, and high critical current density, etc. Electrospinning, as a common method to prepare nanofibers, also has many applications for the preparation of superconducting nanofibers. However, a few of the new methods to fabricate superconducting nanofibers via electrospinning still need further investigations. This review firstly introduces several potential electrospinning methods to obtain superconducting nanofibers, then proceeds to summarize the recent progress in the field of electrospun superconducting materials. The preparation process, difficulties and problems, physical properties of the superconducting nanofibers or nanonetworks (such as superconducting transition temperature, critical current density, critical magnetic field strength, fiber morphology, and structure, etc), theoretical analysis of the properties, and the techniques to improve the performance are also reviewed. In addition, some suggestions and prospects for the development and applications of electrospun superconducting materials in the future are discussed.
Publisher: Wiley
Date: 20-04-2019
Abstract: Regulating fluorescence lifetime of lanthanide nanocomposites is highly desired for optical multiplexing applications, for instance, security printing, anticounterfeiting, and data storage. Herein, sensitive fluorescence lifetime tuning in nanocomposite fibers is reported which are composed of silica-coated gold nanorods assembled in Eu-polystyrene nanofibers. The prepared nanofibers possess unique properties of tunable fluorescence lifetime and distinct textured patterns together with superior flexibility and superhydrophobicity. In a single 612 nm emission channel, over ten different populations of fluorescence lifetime from the range of 322-551 µs are harvested. Thanks to the tunable fluorescence lifetime and different textured patterns, a security pattern to demonstrate optical multiplexing applications is designed. The security pattern hides the real information of "69" in a noticeable scene that shows fake information "8" under UV radiation or "13" by only watching their pattern structures.
Publisher: IOP Publishing
Date: 09-2020
Abstract: Piezoelectric materials such as ZnO semiconductors and polyvinylidene fluoride (PVDF) have been extensively studied to produce flexible wearable devices, providing a viable method for energy collection. In this study, PVDF was mixed with ZnO nanoparticles to prepare PVDF/ZnO devices by electrospinning. The composite ZnO affects the diameter of electrospun fibers and the output performance of the devices. As ZnO was added, the diameter of the fibers decreases, but the output current of the devices increases. Moreover, compared with pristine PVDF, the bending output current and pyroelectric current of the devices were improved after mixed with ZnO. The results indicated that PVDF/ZnO composite was a promising flexible device that can provide power for small electronic devices.
Publisher: Trans Tech Publications, Ltd.
Date: 04-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.609-610.842
Abstract: Besides the conductive patterning substrate, spatially well-defined microfibrous architectures can also be electrospun by using an insulating topographically structured collector ( e.g. a nylon fabric). In both cases, it is proposed that the formation of the electrospun microfibrous patterns can be ascribed to the re-distribution of static electric field whenever collectors with different topography are introduced. Moreover, a series of simulation of the static electric field for various collectors ( e.g. flat Al foil, conductive and insulating patterned substrates) have been systematically made to illustrate the formation mechanism, respectively. Our results are considered to warrant further scientific understanding on the formation of electrospun microfibrous patterning constructs, and helpful for easy generation of spatially defined architectures which have applications in a variety of areas such as tissue engineering, cell adhesion, proliferation and migration, etc .
Publisher: MDPI AG
Date: 17-09-2018
DOI: 10.3390/MA11091744
Abstract: Polyvinyl alcohol oly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PVA/PEDOT:PSS) composite ultrafine fibers were successfully fabricated by high pressure airflow assisted electrospinning. The electrical properties of PVA/PEDOT:PSS nanofibers with different diameters were characterized. The average diameter of the nanofibers can be down to 68 nm. Due to its large specific surface area, ammonia sensing of the ultrafine nanofibers is more sensitive than the traditional electrospun fibers (average fiber diameter of 263 nm). The ammonia sensing properties of the s les were tested by impedance analysis. The results show that ultrafine PVA/PEDOT:PSS nanofibers are more suitable for detecting low concentrations of ammonia with higher sensitivity.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA16491A
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR00676J
Abstract: Patterning of electrospun nanofibers has recently attracted much attention for its usefulness in a wide range of applications. This paper reports on the generation of spatially defined nanofibrous patterns by direct deposition of electrospun nanofibers onto a variety of insulating substrates. It was found that topographical features of different non-conducting substrates could be readily replicated by the electrospun nanofibers of interest. To elucidate the underlying mechanism of nanofiber patterning, we have systematically studied the effects of surface topography of non-conducting substrates (in particular protrusions) on the nanofiber deposition and assembly. Results from experiments and electric field simulation indicated that under a strong electric field the insulating substrates can be polarized, which could consequently affect the distribution of the original electric field. For particular non-conductive substrates with small mesh sizes or sufficient thickness, surface topography of the dielectric substrate may play a key role in determining the deposition and the arrangement of electrospun fibers. In addition, parameters that could influence the fineness of nanofibrous patterns have also been investigated. This contribution is believed to warrant further scientific understanding of the patterning mechanism of electrospun nanofibers, and to allow for design of specific and complex non-conductive substrate collectors for easy generation of patterned nanofibrous architectures, applicable in a variety of areas such as tissue engineering scaffolds and optoelectronic displays.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NR04769H
Abstract: A TENG with a grid structure verified that pressure can change the effective contact area and it can be used as a self-powered code lock.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5RA25576G
Abstract: A possible formation mechanism for γ-Fe 2 O 3 @SiO 2 @PPy core/shell/shell nanospheres with flexible controllability of electromagnetic properties is proposed.
Publisher: Elsevier BV
Date: 02-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR05367F
Abstract: A conventional melt electrospinning setup usually needs a large, heavy high-voltage power supply and cannot work without a plug (electricity supply). In this article, we report a new melt electrospinning setup based on a small hand-operated Wimshurst generator, which can avoid electrical interference between the high-voltage spinning system and the heating system, and make the setup very portable and safe. Poly(lactic acid) (PLA) and polycaprolactone (PCL) fibers with diameters of 15-45 μm were fabricated successfully by using this apparatus. Experimental parameters such as the rotational speed of the generator handle (a half turn to two turns per second) and the spinning distance (2-14 cm) were investigated. In addition, PLA and PCL fibers were directly melt-electrospun onto a pork liver, and the temperature and adhesiveness of the deposited fibers were studied. The results indicate that the apparatus and melt-electrospun polymer microfibers may be used in dressing for wound healing.
Publisher: Elsevier BV
Date: 10-2020
Publisher: IOP Publishing
Date: 02-2010
Publisher: IOP Publishing
Date: 09-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6NR09525A
Abstract: Nanofiber-based air filters and electrostatic precipitation have stimulated considerable interest because of their high-efficiency for PM2.5 capture. In this paper, we introduce a new method of in situ electrospinning (e-spinning) of nanostructures into a polluted enclosed space to efficiently clean the air. From the comparisons of different polymer precursors and different PM2.5 capture techniques, it can be seen that in situ e-spinning of chitosan aqueous solution into the air exhibits the best PM2.5 capture efficiency, which may be attributed to the stronger polarity of chitosan and the synergistic effect of the strong electrostatic adsorption and surface adhesion of the electrospun (e-spun) nanofibers. A removal rate as high as 3.7 μg m
Publisher: IOP Publishing
Date: 04-2012
Publisher: American Chemical Society (ACS)
Date: 29-10-2015
Publisher: American Chemical Society (ACS)
Date: 24-08-2017
Abstract: Metal-free catalysts for oxygen reduction reaction (ORR) are the desired materials for low-cost proton exchange membrane fuel cells. Graphdiyne (GDY), a novel type of two-dimensional carbon allotrope, is featured by its sp- and sp
Publisher: IOP Publishing
Date: 26-07-2017
Publisher: Elsevier BV
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 10-08-2020
DOI: 10.1186/S12951-020-00671-W
Abstract: Electrospun (e-spun) nanofibers for wound dressing have attracted wide attention due to its large specific surface area, large porosity and breathability. Compared with solution electrospinning (e-spinning), melt e-spinning is more bio-friendly without toxic solvent participation, which provides the possibility of in situ e-spinning on wounds directly. However, previously reported melt e-spinning devices were usually bulky and cumbersome due to their necessary heating unit, and different components were separated to avoid electrostatic interference. In this article, we report on a self-powered hand-held melt e-spinning gun which can work without any external power supply (outdoors). The problem of electrostatic interference for this integrated device was solved by using a special high heat transfer insulation unit. The apparatus is easy and safe to operate by a single hand due to its small volume (24 × 6 × 13 cm 3 ) and light weight (about 450 g). Some biodegradable polymers, for ex le, polycaprolactone (PCL) fibers were successful e-spun onto wounds directly by using this dressing gun. PCL fibrous membrane has good biocompatibility and can be in situ electrospun to wound surface as a wound dressing by the portable melt e-spinning gun. Besides wound dressing, this hand-held melt e-spinning gun may be used in 3D printing and experimental teaching demonstration aids.
Publisher: Elsevier BV
Date: 2021
DOI: 10.2139/SSRN.3788469
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer Science and Business Media LLC
Date: 15-07-2020
DOI: 10.1038/S41467-020-17301-6
Abstract: Resistance change under mechanical stimuli arouses mass operational heat, damaging the performance, lifetime, and reliability of stretchable electronic devices, therefore rapid thermal heat dissipating is necessary. Here we report a stretchable strain sensor with outstanding thermal management. Besides a high stretchability and sensitivity testified by human motion monitoring, as well as long-term durability, an enhanced thermal conductivity from the casted thermoplastic polyurethane-boron nitride nanosheets layer helps rapid heat transmission to the environments, while the porous electrospun fibrous thermoplastic polyurethane membrane leads to thermal insulation. A 32% drop of the real time saturated temperature is achieved. For the first time we in-situ investigated the dynamic operational temperature fluctuation of stretchable electronics under repeating stretching-releasing processes. Finally, cytotoxicity test confirms that the nanofillers are tightly restricted in the nanocomposites, making it harmless to human health. All the results prove it an excellent candidate for the next-generation of wearable devices.
Publisher: Springer Science and Business Media LLC
Date: 08-2017
Publisher: Elsevier BV
Date: 2023
Publisher: AIP Publishing
Date: 07-2016
DOI: 10.1063/1.4960211
Abstract: Because of novel features in their structural, electronic, magnetic and optical properties, especially potential applications in nanoelectronics, the few-layer graphene intercalation compounds (FLGICs) have been intensively studied recently. In this work, the dielectric constant of the doped graphene of stage-1 FeCl3-GIC is obtained by fitting the optical contrast spectra. And fully intercalated stage-1 FeCl3-FLGICs were prepared by micromechanical cleavage method from graphite intercalation compounds (GICs) for the first time. Finally, we demonstrated that the thickness of stage-1 FeCl3-GICs by micromechanical cleavage can be determined by optical contrast spectra. This method also can be used to other FLGICs, such as SbCl5-FLGICs and AuCl5-FLGICs, etc.
Publisher: Springer Science and Business Media LLC
Date: 03-10-2018
Publisher: AIP Publishing
Date: 05-03-2007
DOI: 10.1063/1.2711527
Abstract: The role of the nanowire diameter on the electrical properties of isolated poly(3,4-ethylenedioxythiophene) nanowires has been studied systematically by a four-terminal technique. A transition from an insulating to a metallic regime is observed when the diameter decreases from 190to35nm and a transition from a metallic to an insulating regime takes place for the smaller diameters. These results are of importance for the different potential applications based on polymer nanowires or nanotubes.
Publisher: American Chemical Society (ACS)
Date: 27-03-2017
Publisher: IOP Publishing
Date: 23-11-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5NR06858D
Abstract: Electrospinning (e-spinning) devices and electrospun (e-spun) ultrathin fibers have shown promising applications in various fields. However, the poor portability of conventional e-spinning devices limits some potential applications especially in the case without a plug (electricity supply). Consequently, great efforts have been made to modify e-spinning setups with good portability. In this article, a solar cell and a hand generator-powered portable e-spinning (SHPE) setup with good flexibility is introduced, which can be used outdoors without a plug. The SHPE device shows good spinning efficacy both in solution and melt e-spinning processes for a wide range of polymers. Moreover, the designed SHPE apparatus demonstrates potential application in wound dressing by in situ e-spinning fibers onto human skin directly.
Publisher: The Optical Society
Date: 03-05-2018
DOI: 10.1364/OME.8.001425
Publisher: American Chemical Society (ACS)
Date: 09-2023
Publisher: Trans Tech Publications, Ltd.
Date: 12-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.418-420.684
Abstract: Barium titanate (BTO, BaTiO 3 ) nanofiber was prepared via electrospinning and followed annealing process. The as-spun and calcined BTO nanofibers were characterized by a scanning electron microscope (SEM). After annealing at 800 °C in air for 3 h, polycrystalline BTO nanofibers with 120-200 nm in diameter were successfully obtained. I-V characteristic curves of single BTO nanofiber were measured. The p-type semiconducting fiber shows a room-temperature conductivity of about 0.3 S/cm. In addition, the small humidity hysteresis demonstrates the application prospects of electrospun BTO nanofibers in the fabrication of a high-sensitive humidity sensor.
Publisher: AIP Publishing
Date: 07-12-2020
DOI: 10.1063/5.0032920
Abstract: The resistivity, anisotropic magnetic properties, and magnetic critical behavior of single-crystalline Eu3Sb4Se9 with a pseudo-one-dimensional structure have been studied. The resistivity shows a semiconducting temperature dependence, which gives a bandgap of 0.65 eV. The s les are paramagnetic and isotropic at high temperatures and undergo a transition at Tc = 5.1 K into a ferrimagnetic phase. The long crystal dimension, the crystalline b axis, is the easy axis. Below Tc, the s les have a further metamagnetic transition from the ferrimagnetic to ferromagnetic state when the field is along the easy axis. The low-field magnetization around Tc cannot be described by the mean-field theory for a second-order phase transition, but can be well fitted by the modified Arrott plot, which gives a set of critical exponents β = 0.82, γ = 1.08, and δ = 2.35. The magnetic phase diagram for the field applied parallel to the easy axis is finally established.
Publisher: World Scientific Pub Co Pte Lt
Date: 05-01-2021
DOI: 10.1142/S0217979221500429
Abstract: An ultraviolet (UV) sensor consisting of a zinc oxide (ZnO) nanofiber sensing membrane and a quartz crystal microbalance (QCM) was fabricated. ZnO nanofibers were prepared by electrospinning and calcination. The morphology and structure of the nanofiber sensing membrane were characterized by scanning electron microscopy and X-ray diffraction. The QCM sensor based on ZnO nanofibers was found to be sensitive to 254-nm UV light in nitrogen, oxygen and air atmospheres. When the QCM sensor was placed under UV irradiation, the resonant frequency difference rapidly decreased. When the light was removed, the frequency difference recovered until reaching 0 Hz. The stability and repeatability of the proposed ZnO nanofiber-based QCM sensor were demonstrated, and the sensing mechanism was briefly discussed.
Publisher: Elsevier BV
Date: 05-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA14695C
Abstract: A new simple e-spinning setup using a piezoelectric ceramic (PZT) generator as high voltage supply was designed and its performance on electrospinning several polymers was investigated.
Publisher: American Chemical Society (ACS)
Date: 28-06-2008
DOI: 10.1021/JP801928Y
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3TA02761A
Abstract: All-solid-state lithium metal batteries (ASLMBs) have attracted considerable attention owing to their high energy density and as they are highly safe.
Publisher: IOP Publishing
Date: 25-07-2017
Publisher: SPIE
Date: 07-02-2001
DOI: 10.1117/12.416835
Publisher: American Chemical Society (ACS)
Date: 22-12-2022
Publisher: MDPI AG
Date: 20-03-2019
Abstract: Electrospinning (e-spinning) is an emerging technique to prepare ultrafine fibers. Polyphenylene sulfide (PPS) is a high-performance resin which does not dissolve in any solvent at room temperature. Commercial PPS fibers are produced mainly by meltblown or spunbonded process to give fibers ~20 μm in diameter. In this research, an in-house designed melt electrospinning device was used to fabricate ultrafine PPS fibers, and the e-spinning operation conducted under inert gas to keep PPS fibers from oxidizing. Under the optimum e-spinning conditions (3 mm of nozzle diameter, 30 kV of electrostatic voltage, and 9.5 cm of tip-to-collector distance), the as-spun fibers were less than 8.0 μm in diameter. After characterization, the resultant PPS fibers showed uniform diameter and structural stability. Compared with commercial PPS staple fibers, the obtained fibers had a cold crystallization peak and 10 times higher storage modulus, thereby offering better tensile tenacity and more than 400% elongation at break.
Publisher: Elsevier BV
Date: 12-2005
Publisher: Trans Tech Publications, Ltd.
Date: 09-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.785-786.517
Abstract: Fluorescent crossbar arrays and microropes of fluorescein/PMMA and rhodamine B/PS composite nanofibers have been fabricated via centrifugal electrospinning, respectively. The morphology and structures were measured by SEM and fluorescence microscope. The two as-spun fluorescent structures have potential applications in fluorescent security, fluorescent detection, and so on. By regulating the number of the nanofibers consisted in the microropes, the fluorescence intensity of the microropes can be manipulated, as well as the mechanical property of in idual nanofibers, which can be calculated easily by testing that of the whole microrope.
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 03-2022
Publisher: Springer Science and Business Media LLC
Date: 05-06-2014
DOI: 10.1038/NCOMMS5007
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5NR08367B
Abstract: Current strategies for wound care provide limited relief to millions of patients who suffer from burns, chronic skin ulcers or surgical-related wounds. The goal of this work is to develop an in situ deposition of a personalized nanofibrous dressing via a handy electrospinning (e-spinning) device and evaluate its properties related to skin wound care. MCM-41 type mesoporous silica nanoparticles decorated with silver nanoparticles (Ag-MSNs) were prepared by a facile and environmentally friendly approach, which possessed long-term antibacterial activity and low cytotoxicity. Poly-ε-caprolactone (PCL) incorporated with Ag-MSNs was successfully electrospun (e-spun) into nanofibrous membranes. These in situ e-spun nanofibrous membranes allowed the continuous release of Ag ions and showed broad-spectrum antimicrobial activity against two common types of pathogens, Staphylococcus aureus and Escherichia coli. In addition, the in vivo studies revealed that these antibacterial nanofibrous membranes could reduce the inflammatory response and accelerate wound healing in Wistar rats. The above results strongly demonstrate that such patient-specific dressings could be broadly applied in emergency medical transport, hospitals, clinics and at the patients' home in the near future.
Publisher: Elsevier BV
Date: 12-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NR00179E
Abstract: Outdoor hemostasis and simultaneous photodynamic sterilization of superbacteria via one-stop treatment using the same fibers prepared by a portable electrospinning device.
Publisher: Elsevier BV
Date: 10-2011
Publisher: Elsevier BV
Date: 10-2021
Publisher: American Chemical Society (ACS)
Date: 14-04-2021
Publisher: Wiley
Date: 15-03-2019
Abstract: Here, a new approach to further improve graphdiyne (GDY) based materials by using benzyl disulfide (BDS) as the sulfur source is demonstrated. The S radicals, generated from the homolysis of BDS, can react with the acetylenic bonds and be well confined in the triangle-like pores of GDY, forming S-GDY. The as-prepared S-GDY, which possesses numerous heteroatom defects and active sites, is suitable for applications in many electronic devices, such as lithium ion batteries (LIBs). As expected, the assembled LIBs based on S-GDY displayed improved electrochemical properties, including larger capacity and superior rate capability.
Publisher: Elsevier BV
Date: 08-2003
Publisher: IOP Publishing
Date: 06-2008
Publisher: IOP Publishing
Date: 08-10-2018
Publisher: American Chemical Society (ACS)
Date: 13-08-2018
Abstract: Moravec's paradox shows that low-level sensorimotor skills are more difficult than high-level reasoning in artificial intelligence and robotics. So simplifying every sensing unit on electronic skin is critical for endowing intelligent robots with tactile and temperature sense. The human nervous system is characterized by efficient single-electrode signal transmission, ensuring the efficiency and reliability of information transmission under big data conditions. In this work, we report a sensor based on a single-electrode piezoelectric nanogenerator (SPENG) by electrospun polyvinylidene fluoride (PVDF) nanofibers that can realize steady-state sensing of pressure integrating cold/heat sensing on a single unit. Piezoelectric signals appear as square wave signals, and the thermal-sensing signals appear as pulse signals. Therefore, the two signals can be acquired by a single unit simultaneously. The SPENG overcomes the shortcoming of electronic skins based on a single-electrode triboelectric nanogenerator (STENG), which can sense only dynamic movement and cannot sense temperature variations. The new sensor configuration uses a capacitor instead of the STENG's ground wire as a potential reference, allowing it to be used for truly autonomous robots. At the same time, the traditional advantages of polymer piezoelectric materials, such as flexibility, transparency, and self-powered advantages, have also been preserved.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR00387C
Abstract: Self-powered electrospinning apparatus based on a hand-operated Wimshurst generator.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA04566A
Abstract: Solvent-free electrospinning UV curable materials into ultrathin fibers under UV light radiation and in atmosphere of N 2 or air.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3RA00212H
Abstract: The corrosion of materials severely limits the application scenarios of triboelectric nanogenerators (TENGs), especially in laboratories, chemical plants and other fields where leakage of chemically corrosive solutions is common.
Publisher: Elsevier BV
Date: 08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7TA10175A
Abstract: A flexible hybrid piezoelectric–pyroelectric nanogenerator has been constructed using non-woven nanofiber membranes, which can in idually or simultaneously harvest mechanical and thermal energies.
Publisher: American Scientific Publishers
Date: 12-2019
Abstract: Developing basement membranes (BMs) substitute remains major problem for constructing functional tissue engineered skin because of its complex structure and multifunction of regulating cellular behavior. Herein, a stable electrospinning method was employed to generate a biomimetic model of natural BMs based on novel scaffold electrospun from Poly(ɛ-caprolactone) (PCL) and cellulose acetate (CA) incorporated with chitosan (CS). The morphology, structure, surface hydrophilicity, roughness and mechanical tensile strength of prepared monolayer and tri-layered scaffold were comprehensively compared. Besides, co-culture system via seeding keratinocytes (Kcs) and fibroblasts (Fbs) on opposite side of tri-layered scaffold revealed more effective segregation of both cell types within the central nanofibrous barrier together with enhanced cell attachment and proliferation than that on the monolayer scaffold. Moreover, the deposition of type VII collagen and laminin-5 was examined in comparison with normal skin BMs. Furthermore, the histological studies revealed characteristics of reconstructing BM zone at the junction of dermis-epidermis after in vivo implantation for 2 weeks, and wound healing while the seeded cells interacted with the endogenous cells. Additionally, the expression of active integrin β 1 and phosphorylated focal adhesion kinase (FAK) was promoted with treatment of tri-layered scaffold. This study stressed that this tri-layer scaffold might provoke biomimetic responses of Kcs and Fbs and thus be applied for future development of BMs containing tissues.
Publisher: Elsevier BV
Date: 11-2014
Publisher: American Chemical Society (ACS)
Date: 24-01-2020
Abstract: In complex environments, there are often toxic and harmful conditions, and so self-powered sensors that use wireless access have a huge advantage. However, there is still a risk of short circuit for self-powered sensors in harsh environments. A single-electrode self-powered sensor was designed, which can be used to monitor body movements such as walking and running, as well as monitoring the motion of some mechanical devices, such as peristaltic pumps, door, and window switches. By using a threshold delay algorithm, this self-powered sensor can be connected to the phone to warn the phone user to check for theft or illegal intrusion when the door and window are opened. Further research shows that the single-electrode configuration can avoid the short-circuit behavior caused by device damage so that the self-powered sensor can still work even if it is pierced. Therefore, the wireless single-electrode self-powered sensor system has better reliability and is more applicable to harsh environments.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR02191J
Abstract: La-doped p-type ZnO nanofibers were successfully synthesized by electrospinning, followed by calcination. The microstructure and morphology of the La-doped ZnO nanofibers were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The field effect curve of in idual nanofibers confirms that the resulting La-doped ZnO fibers are p-type semiconductors. The doping mechanism is discussed. Furthermore, crossed p-n homojunction nanofibers were also prepared based on electrospun La-doped p-type ZnO and n-type pure ZnO fibers. The current-voltage curve shows the typical rectifying characteristic of a p-n homojunction device. The turn-on voltage appears at about 2.5 V under the forward bias and the reverse current is impassable.
Publisher: Elsevier BV
Date: 10-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR01412J
Abstract: Rapid hemostasis of solitary organs is still a big challenge in surgical procedures or after major trauma in both civilians and on the battlefield. Here, we report the first use of an airflow-directed in situ electrospinning method to precisely and homogeneously deposit a medical glue of n-octyl-2-cyanoacrylate (OCA) ultrathin fibers onto a wound surface to realize rapid hemostasis in dozens of seconds. In vivo and in vitro experiments on pig liver resection demonstrate that the self-assembled electrospun OCA membrane with high strength, good flexibility and integrity is very compact and no fluid seeping is observed even under a pressure of 147 mm Hg. A similar effect has been achieved in an in vivo experiment on pig lung resection. The results provide a very promising alternative for rapid hemostasis of solitary organs as well as other traumas, providing evidence that the postoperative drainage tube may not be always necessary for surgery in the near future.
Publisher: American Chemical Society (ACS)
Date: 03-06-2016
Publisher: Elsevier BV
Date: 05-2020
Publisher: Trans Tech Publications, Ltd.
Date: 02-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.465.125
Abstract: In this paper, we report on fabrication and physical properties of carbon microcoils, which are prepared by a chemical vapor deposition (CVD) process with Ni-catalyzed pyrolysis of acetylene, and characterized by a scanning electron microscope, a transmission electron microscope and an infrared spectrometer. The dark electrical conductivity of an isolated carbon microcoil is about 81 S/cm at room temperature, and its temperature dependence follows three-dimensional Mott variable-range hopping (VRH) model. Particularly, evident photocurrent is observed in the carbon microcoil upon cameral flash illumination. In addition, it is found that the surface of microcoil film is hydrophobic, showing a large water contact angle of about 135°. These results indicate that carbon microcoils have excellent physical properties, and can be used as optoelectronic and reinforced materials.
Publisher: Trans Tech Publications, Ltd.
Date: 06-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.688.334
Abstract: In this work, we report on conducting polyaniline (PANI) nanostructures synthesized by a simplified template-free self-assembly method, which are doped with different oxidants such as ammonium persulfate (APS), FeCl 3 , Fe(NO 3 ) 3 , and Fe 2 (SO 4 ) 3 . It is found that the morphologies of the as-prepared PANI nanowires are dependent on the oxidant and the molar ratio of aniline to oxidant. The PANI nanostructures are semiconducting with room-temperature conductivity ranging from 10 -2 to 10 0 S/cm, and the temperature dependence of conductivity follows three-dimensional Mott variable range hopping (3D Mott-VRH) model. In addition, the PANI pellets exhibit hydrophilic behavior.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2RA07084G
Abstract: Flexible fiber membranes for pollutant removal have received increasing attention due to their high adsorption performance and easy recycling characteristics.
Publisher: Wiley
Date: 03-03-2009
DOI: 10.1002/PAT.1379
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 11-2022
Publisher: Trans Tech Publications, Ltd.
Date: 03-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.486.60
Abstract: In this paper, non-woven micro-/nanofibers and wavelike micro-ribbons were produced by a low-voltage near-field electrospinning with working voltage less than 2.8 kV and spinning distance less than 8 mm. A series of experiments were carried out to explore the influence of processing variables on the formation of near-field electrospun nanofibers (polyvinyl pyrrolidone (PVP) as an ex le), including concentration, humidity and spinning distance. The formation mechanism of helical fibers and wavelike micro-ribbons was also discussed, which can be ascribed to electrical driven bending instability and/or mechanical jet buckling when hitting the collector surface. The results indicate that the morphology of the electrospun fibers can be controlled by experimental variables. And the low-voltage near-field electrospinning is a promising technique which may be used in precision deposition of nanofibers for nanodevices, direct-write nanofabrication, etc .
Publisher: Trans Tech Publications, Ltd.
Date: 04-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.789.32
Abstract: Using patterned conductive and insulating collection devices, fibrous patterns from polyvinyl pyrrolidone were fabricated by electrospinning. Considering that the electrospun fibers tend to deposit along the direction of electric field line, when conductive patterned template is used as collector during electrospinning, the as-spun fibers tend to assemble onto the conductive grids, whereas the dropping fibers prefer to avoid insulation grid by concentrating toward the surface of the Al foil when an insulating grid based on Al foil is used as collector.
Publisher: Wiley
Date: 27-12-2017
Abstract: Self-activated phosphors are capable of generating optical emissions from the internal ion groups of host lattice before externally introducing luminescent ions. However, numerous self-activated phosphors only show luminescence at low temperature due to the thermally activated energy migration among ion groups at room temperature, severely confining their application conditions. In this letter, we propose a strategy to converting the low-temperature luminescence to a room-temperature one through changing the synthesis conditions to induce structural distortions and thus to limit energy migration. Room-temperature self-activated luminescence of Ca
Publisher: IOP Publishing
Date: 29-07-2008
Publisher: American Chemical Society (ACS)
Date: 07-2008
DOI: 10.1021/JP709872K
Publisher: Springer Science and Business Media LLC
Date: 07-04-2021
DOI: 10.1186/S11671-021-03513-2
Abstract: Bacterial infection especially caused by multidrug-resistant bacteria still endangers human life. Photodynamic therapy (PDT) can effectively kill bacteria, and nanofiber-based PDT can effectively reduce damage to normal tissues. However, current photosensitizers coated on the surfaces of fibers would release to the wound, causing some side effects. And nanofibers prepared by traditional method exhibit poor adhesion on the wound, which severely reduces the PDT effect due to its short-range effect. Herein, core–shell curcumin composite nanofibers are prepared by in situ electrospinning method via a self-made portable electrospinning device. The obtained composite nanofibers show superior adhesiveness on different biological surface than that of traditional preparation method. Upon 808-nm irradiation, these composite nanofibers effectively produced singlet oxygen ( 1 O 2 ) without curcumin falling off. After these composite nanofibers’ exposure to drug-resistant bacteria, they exhibit dual antibacterial behaviors and efficiently kill the drug-resistant bacteria. These dual antibacterial nanofiber membranes with excellent adhesiveness may benefit the application of wound infection as antibacterial dressing.
Publisher: Springer Science and Business Media LLC
Date: 17-08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5NR01439E
Abstract: The Ligament Advanced Reinforcement System (LARS) has been considered as a promising graft for ligament reconstruction. To improve its biocompatibility and effectiveness on new bone formation, we modified the surface of a polyethylene terephthalate (PET) ligament with nanoscale silica using atom transfer radical polymerization (ATRP) and silica polymerization. The modified ligament is tested by both in vitro and in vivo experiments. Human osteoblast testing in vitro exhibits an ∼21% higher value in cell viability for silica-modified grafts compared with original grafts. Animal testing in vivo shows that there is new formed bone in the case of a nanoscale silica-coated ligament. These results demonstrate that our approach for nanoscale silica surface modification on LARS could be potentially applied for ligament reconstruction.
Publisher: Elsevier BV
Date: 12-2022
Publisher: AIP Publishing
Date: 06-09-2004
DOI: 10.1063/1.1786370
Abstract: A multiwalled carbon nanotube∕polyaniline composite with cablelike morphology has been synthesized by an in situ chemical oxidative polymerization directed with cationic surfactant cetyltrimethylammonium bromide. It is interestingly found that with increasing carbon nanotube loading from 0 to 24.8wt%, the conductivity increases by two orders of magnitude and the Mott’s characteristic temperature T0 which depends on the hopping barrier decreases by three orders of magnitude. Furthermore, the low-temperature magnetoresistance has also changed the sign from positive to negative. The results reveal a strong coupling between the carbon nanotube and the tightly coated polymer chains, which enhances the average localization length and the electronic properties of the composites.
Publisher: Springer Science and Business Media LLC
Date: 15-08-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA21882B
Abstract: Solidification mechanism of PU microfibers fabricated by solvent-free e-spinning under thermal radiation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA08909E
Abstract: Herein, we report a non-toxic triboelectric nanogenerator for baby care applications.
Publisher: IOP Publishing
Date: 02-02-2018
Publisher: Wiley
Date: 07-2004
Publisher: WORLD SCIENTIFIC
Date: 22-04-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3PY00718A
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CS15335A
Abstract: Semiconducting inorganic nanowires (NWs), nanotubes and nanofibers have been extensively explored in recent years as potential building blocks for nanoscale electronics, optoelectronics, chemical/biological/optical sensing, and energy harvesting, storage and conversion, etc. Besides the top-down approaches such as conventional lithography technologies, nanowires are commonly grown by the bottom-up approaches such as solution growth, template-guided synthesis, and vapor-liquid-solid process at a relatively low cost. Superior performance has been demonstrated using nanowires devices. However, most of the nanowire devices are limited to the demonstration of single devices, an initial step toward nanoelectronic circuits, not adequate for production on a large scale at low cost. Controlled and uniform assembly of nanowires with high scalability is still one of the major bottleneck challenges towards the materials and device integration for electronics. In this review, we aim to present recent progress toward nanowire device assembly technologies, including flow-assisted alignment, Langmuir-Blodgett assembly, bubble-blown technique, electric/magnetic- field-directed assembly, contact/roll printing, planar growth, bridging method, and electrospinning, etc. And their applications in high-performance, flexible electronics, sensors, photovoltaics, bioelectronic interfaces and nano-resonators are also presented.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA09558E
Abstract: With the emergence of one-dimensional (1D) functional nanomaterials and their promising applications, electrospinning (e-spinning) technology and electrospun (e-spun) ultrathin fibers have been widely explored.
Publisher: American Chemical Society (ACS)
Date: 31-01-2019
Publisher: The Optical Society
Date: 31-05-2013
DOI: 10.1364/OE.21.013699
Publisher: Springer Science and Business Media LLC
Date: 14-09-2017
DOI: 10.1038/S41598-017-11698-9
Abstract: The new two-dimensional graphitic material, graphdiyne, has attracted great interest recently due to the superior intrinsic semiconductor properties. Here we investigate the magnetism of pure graphdiyne material and find it demonstrating a remarkable paramagnetic characteristic, which can be attributed to the appearance of special sp -hybridized carbon atoms. On this basis, we further introduce nitrogen with 5.29% N/C ratio into graphdiyne followed by simply annealing in a dopant source and realize a twofold enhancement of saturation moment at 2 K. Associate with the density of states calculation, we investigate the influence of the nitrogen atom doping sites on paramagnetism, and further reveal the important role of doped nitrogen atom on benzene ring in improving local magnetic moment. These results can not only help us deeply understand the intrinsic magnetism of graphdiyne, but also open an efficient way to improve magnetism of graphdiyne by hetero atom doping, like nitrogen doping, which may promote the potential application of graphdiyne in spintronics.
Publisher: IOP Publishing
Date: 26-10-2004
Publisher: Trans Tech Publications, Ltd.
Date: 05-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.319.43
Abstract: Nanocrystalline and porous barium titanate (BaTiO3) nanofibers with diameter 200-400 nm were synthesized via electrospinning and followed calcinations. The morphology and microstructure of the nanofibers were characterized using field emission scanning electron microscope, X-ray diffractometer and transmission electron microscope, respectively. And the electrical and humidity sensing properties of the nanofibers were also measured. The results reveal that the BaTiO3 nanofibers have a conductivity of about 0.3 S/cm, and show an ultrafast response time (~0.7 s) and a recovery time (~0.4 s) to humidity at room temperature. In addition, the sensing mechanism was also discussed briefly based on its nanocrystalline and porous microstructure of the electrospun material.
Publisher: Springer Science and Business Media LLC
Date: 12-2016
Publisher: IOP Publishing
Date: 05-09-2017
Publisher: Elsevier BV
Date: 2003
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA05151B
Abstract: We present a generic method for preparing flexible inorganic piezoelectric materials that can be adapted to a variety of surfaces, and successfully applied in the field of piezoelectric catalysis.
Publisher: AIP Publishing
Date: 26-08-2003
DOI: 10.1063/1.1606864
Abstract: We report the electrical properties of a single conducting polyaniline nanotube measured by a standard four-terminal technique. C hor sulfonic acid doped polyaniline nanotubes were self-assembled by a template-free method. The directly measured conductivity of the single polyaniline nanotube is very high (∼31.4 S/cm), and its temperature dependence follows the three-dimensional variable range hopping model. However, the bulk conductivity of the polyaniline nanotube pellets is much smaller than the nanotube itself (only 3.5×10−2 S/cm) and ln ρ(T) is linear in T−1/2, which is due to the large intertubular contact resistance. These results will help us to understand the conduction mechanism in conducting polymers.
Publisher: Wiley
Date: 03-01-2022
Abstract: Stimulus‐responsive nanofibers can adjust the speed of drug delivery, and real‐time monitoring elucidates the relationship between drug release and therapeutic efficacy. Both of these advantages have great potential in clinical therapy. However, the complex preparation of current stimulus‐responsive drug‐loaded nanofibers leads to low drug‐loading levels, limiting their widespread applications. In this study, we prepared pH‐responsive drug‐loaded nanofibers with fluorescence monitoring properties using the electrospinning method. A representative drug of DOX was loaded onto the nanofibers. The degradable flexible nanofibers modified by amino groups attained higher drug loading and controlled drug release. Precisely, the rate of drug release varies with different pH. Faster release speed occurs in the tumor microenvironment with faintly acidic conditions than in healthy tissues with neutral conditions. The pH‐responsive mechanism was due to hydrazone bonds between the amino groups and DOX molecules, which FTIR confirmed. In addition, these pH‐responsive nanofibers with intense upconversion fluorescence enable more sensitive monitoring, whereas weak luminescence cannot achieve.
Publisher: Springer Science and Business Media LLC
Date: 10-09-2018
Publisher: Wiley
Date: 07-11-2019
Abstract: Rapid and effective hemostatic materials have received wide attention not only in the battlefield but also in hospitals and clinics. Traditional hemostasis relies on materials with little designability which has many limitations. Nanohemostasis has been proposed since the use of peptides in hemostasis. Nanomaterials exhibit excellent adhesion, versatility, and designability compared to traditional materials, laying a good foundation for future hemostatic materials. This review first summarizes current hemostatic methods and materials, and then introduces several cutting-edge designs and applications of nanohemostatic materials such as polypeptide assembly, electrospinning of cyanoacrylate, and nanochitosan. Particularly, their advantages and working mechanisms are introduced. Finally, the challenges and prospects of nanohemostasis are discussed.
Publisher: Wiley
Date: 05-04-2017
Publisher: MDPI AG
Date: 29-08-2018
Abstract: In this paper, a novel electrostatic-assisted melt blown process was reported to produce polypropylene (PP) microfibers with a diameter as fine as 600 nm. The morphology, web structure, pore size distribution, filtration efficiency, and the stress and strain behavior of the PP nonwoven fabric thus prepared were characterized. By introducing an electrostatic field into the conventional melt-blown apparatus, the average diameter of the melt-blown fibers was reduced from 1.69 to 0.96 μm with the experimental setup, and the distribution of fiber diameters was narrower, which resulted in a filter medium with smaller average pore size and improved filtration efficiency. The polymer microfibers prepared by this electrostatic-assisted melt blown method may be adapted in a continuous melt blown process for the production of filtration media used in air filters, dust masks, and so on.
Publisher: Elsevier BV
Date: 03-2014
Publisher: IOP Publishing
Date: 09-2008
Publisher: Wiley
Date: 15-03-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TC01578A
Abstract: Highlighting the novelty of the work: ionic-liquid-doped PEDOT twisted fibers exhibit a higher conductivity and show a repeatable cycle loop of tensile-resilience.
Publisher: World Scientific Pub Co Pte Lt
Date: 10-05-2015
DOI: 10.1142/S0217979215500666
Abstract: Barium titanate (BTO) nanofibers were synthesized by electrospinning and followed calcination. The morphologies and microstructures of the nanofibers were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Calcinating temperature and process greatly influenced the surface morphology of the nanofibers. In addition, parallel BTO nanofibers were also successfully produced by a centrifugal electrospinning technique. And the humidity sensing properties of the nanofibers were measured. The results showed an ultrafast response time (~0.5 s) and a recovery time (~0.4 s) to humidity at room temperature, which revealed excellent humidity sensitivity performance.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA16268A
Abstract: A new technique to fabricate ultrathin colorful fibers has been developed via ultraviolet (UV)-assisted solventless electrospinning.
Publisher: MDPI AG
Date: 30-07-2019
DOI: 10.3390/NANO9081090
Abstract: Self-powered nanogenerators composed of poly(vinylidene fluoride) (PVDF) have received much attention. Solution blow spinning (SBS) is a neoteric process for preparing nanofiber mats with high efficiency and safely, and SBS is a mature fiber-forming technology that offers many advantages over conventional electrospinning methods. Herein, we adopted the SBS method to prepare independent PVDF nanofiber membranes (NFMs), and successfully employed them as nanogenerators. Finally, we tested the change in the output current caused by mechanical compression and stretching, and studied its durability and robustness by charging the capacitor, which can drive tiny electronic devices. The results show that the PVDF nanogenerators by using this SBS equipment can not only be used in wearable electronic textiles, but are also suitable for potential applications in micro-energy harvesting equipment.
Publisher: MDPI AG
Date: 04-2019
Abstract: This study shows the feasibility of using electrospinning technique to prepare polytetrafluoroethylene oly (vinyl alcohol) (PTFE/PVA) nanofibers on PTFE microfiber membrane as substrate. Then, PVA in the fiber membrane was removed by thermal treatment at about 350 °C. Compared to PTFE microfiber substrates, the composite PTFE fiber membranes (CPFMs) have improved filtration efficiency by 70% and water contact angle by 23°. Experimental test data showed that the water contact angle of the s le increased from about 107° to 130°, the filtration efficiency of PM2.5 increased from 44.778% to 98.905%, and the filtration efficiency of PM7.25 increased from 66.655% to 100% due to the electrospun PTFE nanofiber layer. This work demonstrates the potential of CPFMs as a filter for the production of indoor or outdoor dust removal and industrially relevant gas filtration.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5NR08618C
Abstract: A patterned nanofibrous PANI/PVDF strain sensor shows a high stretchability of more than 110% and can be used to detect finger motion.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7RA13058A
Abstract: A flexible SiO 2 porous fiber membrane (SF) is prepared by electrospinning followed by calcination in this work.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CP03975A
Abstract: A symmetrical quasiclassical (SQC) dynamics approach based on the Li–Miller (LM) mapping Hamiltonian (SQC-LM) was employed to describe nonadiabatic dynamics.
Publisher: World Scientific Pub Co Pte Ltd
Date: 25-10-2021
DOI: 10.1142/S1793292021501435
Abstract: Multifunctional composite nanostructure prepared via electrospinning has attracted wide attention. In this study, Fe 2 O 3 -carbon composite nanofiber with particle–nanorod structure was successfully prepared via electrospinning and followed calcination. Then, the electromagnetic properties of this material have been fully characterized, and the influence of different preparation conditions on these properties has been studied. In addition, compared to pure [Formula: see text]-Fe 2 O 3 nanoparticles and hollow Fe 2 O 3 nanofibers, the composite nanofibers with a thickness of 2.64[Formula: see text]mm exhibited an additional absorption peak at a frequency of 13.92[Formula: see text]GHz and an enhancement in absorption at a frequency of 15.45[Formula: see text]GHz, which may be attributed to the increase in electrical loss introduced by amorphous carbon and the enhanced magnetic loss resulting from the multi-stage reflection introduced by the particle–nanorod structure. This study shows that the composite of Fe 2 O 3 and carbon, and the introduction of the particle–nanorod structure can improve the microwave absorption efficiency of materials, and more nanocomposites can be designed like this to further improve their electromagnetic properties and absorption efficiency in the future.
Publisher: Elsevier BV
Date: 12-2005
Publisher: Informa UK Limited
Date: 03-2010
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR02802A
Abstract: Kinds of portable electrospinning devices for in situ personal wound care including hand-held spinneret, battery powered and generator powered ones were reviewed.
Publisher: Springer Science and Business Media LLC
Date: 20-11-2009
DOI: 10.1007/S11671-008-9203-8
Abstract: In this paper, we focus on current–voltage ( I–V ) characteristics in several kinds of quasi-one-dimensional (quasi-1D) nanofibers to investigate their electronic transport properties covering a wide temperature range from 300 down to 2 K. Since the complex structures composed of ordered conductive regions in series with disordered barriers in conducting polymer nanotubes/wires and CdS nanowires, all measured nonlinear I–V characteristics show temperature and field-dependent features and are well fitted to the extended fluctuation-induced tunneling and thermal excitation model (Kaiser expression). However, we find that there are surprisingly similar deviations emerged between the I–V data and fitting curves at the low bias voltages and low temperatures, which can be possibly ascribed to the electron–electron interaction in such quasi-1D systems with inhomogeneous nanostructures.
Publisher: The Optical Society
Date: 13-06-2017
DOI: 10.1364/OE.25.014238
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/713275
Abstract: Uniaxially aligned and cross-aligned arrays of ultrafine polymer fibers have been fabricated by a novel and effective centrifugal electrospinning setup with rotating polymer solution jets. Comparing with conventional electrospinning (10–30 kV) and centrifugal spinning (4,000–12,000 rpm), this technique only requires a lower working voltage (2.8–6.0 kV), a slower rotational speed (360–540 rpm), and a shorter spinning distance (2.0–4.0 cm). In addition, the influences of experimental parameters such as working voltage, rotational speed, collecting distance, and solution concentration on the alignment of the as-spun fibers are investigated using image analysis techniques. It is found that the working voltage and rotational speed mainly influence the perpendicular and linear velocities of the fibers, respectively. The polymer fibers tend to show higher alignment degree when these two velocities are very close. Optimum conditions (working voltage 3.0 kV, rotational speed 420 rpm, collecting distance 2.5 cm, and solution concentration 18 wt%) to maximize alignment degree ( ~ 97%) of polystyrene fibers are also obtained.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2TB02029G
Abstract: Introduction of low-density fibrous network actively promoted the cell-mediated matrix remodeling and enhanced the formation of structurally homogeneous tissue-like cell sheets.
Publisher: American Chemical Society (ACS)
Date: 16-10-2017
Publisher: Springer Science and Business Media LLC
Date: 12-2015
Publisher: AIP Publishing
Date: 27-01-2014
DOI: 10.1063/1.4863409
Abstract: Ce-doped p-type ZnO nanofibers were synthesized by electrospinning and followed calcinations. The surface morphology, elementary composition, and crystal structure of the nanofibers were investigated. The field effect curve confirms that the resultant Ce-doped ZnO nanofibers are p-type semiconductor. A p-n heterojunction device consisting of Ce-doped p-type ZnO nanofibers and n-type indium tin oxide (ITO) thin film was fabricated on a piece of quartz substrate. The current-voltage (I-V) characteristic of the p-n heterojunction device shows typical rectifying diode behavior. The turn-on voltage appears at about 7 V under the forward bias and the reverse current is impassable.
Publisher: Elsevier BV
Date: 11-2022
Publisher: IOP Publishing
Date: 07-2008
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7RA10474J
Abstract: In this work, a highly stretchable humidity sensor based on spandex covered yarns and nanostructured polyaniline was fabricated, and maintains its humidity sensitivity well at different elongations.
Publisher: Elsevier BV
Date: 12-2022
Publisher: Trans Tech Publications, Ltd.
Date: 08-2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.562-564.277
Abstract: Electrospinning is a simple and practical method for fabricating uniform fibers with diameters range from several micrometers down to a few nanometers. In order to achieve highly ordered arrays of nanofibers, a novel and feasible approach, named contact-transfer printing of electrospun fibers, is reported in this paper. Via this method, large-scale aligned nanofibers on various rigid or flexible substrates can be assembled. This technique is demonstrated to be efficient on transferring of electrospun nanofibers with a high degree of alignment (~88.2%) on a SiO2 substrate. In addition, it is found that the printing outcome highly depends on the pressure between collecting and receiving substrate.
Publisher: Elsevier BV
Date: 10-2022
DOI: 10.1016/J.IJBIOMAC.2022.07.126
Abstract: Burns and scalds are thermal injuries caused by a large amount of heat accumulation in local tissues. The first cooling emergency is a key step. However, it is hard that in outdoors to find clean water to cool the scald tissue sites. Moreover, most dressings are concentrated on the treatment process today, neglecting the emergency treatment of temperature reduction. In this study, we imported refrigeration in the electrospinning process while using dirty water, rainwater and even urine of outdoors, so that the cooled sterile fibers were directly deposited on the burn and scald wounds, and the cooling emergency was achieved through the dual cooling mechanism. Since this fiber which is made up of cheap fish gelatin contains CuS adopting the green method, it can generate heat and effectively kill bacteria under the irradiation of an illumination l at the front end of a spinning device. As a result of the direct deposition, there is an excellent fit between the fibrous membrane and the skin, which reduces the air gap to achieve a better and quick cooling and heating effects. On the same Chitosan/Platelet-derived Growth Factor fiber membrane, this method of cooling first and heating second can shorten the recovery time from 30 days to 21 days. Thus, this treatment strategy has a great potential application prospect in the field of outdoor burn treatment.
Publisher: Elsevier BV
Date: 03-2010
Publisher: Springer Science and Business Media LLC
Date: 19-08-2019
Publisher: American Chemical Society (ACS)
Date: 02-12-2020
Abstract: Wound dressings are an important element in promoting the healing of wounds. Electrospun fibrous materials have a highly porous structure and controllable antibacterial activity and are therefore popular as potential wound dressings. However, electrospun fibrous wound dressings are usually conveniently packaged for immediate use but cannot accommodate irregularly shaped wounds, and their misuse runs the risk of causing a secondary injury to the wound. To overcome these issues,
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 03-1970
Publisher: Elsevier BV
Date: 06-2018
Publisher: American Chemical Society (ACS)
Date: 14-10-2020
Publisher: AIP Publishing
Date: 10-03-2004
DOI: 10.1063/1.1687457
Abstract: We report on the electrical properties of a conducting polyaniline (PANI) derivative film containing azobenzene side chain. The freestanding thin film of HCl-doped PANI derivative was synthesized through an N-alkyl-substituted reaction. We found that the side of the film irradiated by a weak ultraviolet light during the preparation is a poor conductor at room temperature and shows abnormal V–I characteristics. Its resistance decreases sharply with increasing temperature. However, the other side of the film without irradiation is highly conductive. The room-temperature conductivity is about 1.2 S/cm, which is much higher than that of other N-alkyl-substituted polyanilines (10−2–10−7 S/cm). The temperature dependence of resistance follows one-dimensional variable-range hopping model.
Publisher: American Chemical Society (ACS)
Date: 16-09-2020
Publisher: IOP Publishing
Date: 23-04-2008
DOI: 10.1088/0957-4484/19/21/215708
Abstract: The current-voltage (I-V) characteristics and electrical resistivity of isolated potassium manganese oxide (K(0.27)MnO(2)·0.5H(2)O) nanowires prepared by a simple hydrothermal method were investigated over a wide temperature range from 300 to 4 K. With lowering temperature, a transition from linear to nonlinear I-V curves was observed around 50 K, and a clear zero bias anomaly (i.e., Coulomb gap-like structure) appeared on the differential conductance (dI/dV) curves, possibly due to enhanced electron-electron interaction at low temperatures. The temperature dependence of resistivity, [Formula: see text], follows the Efros-Shklovskii (ES) law, as expected in the presence of a Coulomb gap. Here we note that both the ES law and Coulomb blockade can in principle lead to a reduced zero bias conductance at low temperatures in this study we cannot exclude the possibility of Coulomb-blockade transport in the measured nanowires, especially in the low-temperature range. It is still an open question how to pin down the origin of the observed reduction to a Coulomb gap (ES law) or Coulomb blockade.
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 07-2017
DOI: 10.1016/J.MSEC.2017.03.034
Abstract: Electrospinning has been widely used as a nanofiber fabrication technique. Its simple process, cost effectiveness and versatility have appealed to materials scientists globally. Pristine polymeric nanofibers or composite nanofibers with dissimilar morphologies and multidimensional assemblies ranging from one dimension (1D) to three dimensions (3D) can be obtained from electrospinning. Critically, these as-prepared nanofibers possessing high surface area to volume ratio, tunable porosity and facile surface functionalization present numerous possibilities for applications, particularly in biomedical field. This review gives us an overview of some recent advances of electrospinning-based nanomaterials in biomedical applications such as antibacterial mats, patches for rapid hemostasis, wound dressings, drug delivery systems, as well as tissue engineering. We further highlight the current challenges and future perspectives of electrospinning-based nanomaterials in the field of biomedicine.
Publisher: Elsevier BV
Date: 08-2019
DOI: 10.1016/J.MSEC.2019.03.075
Abstract: An auxiliary electrode electrospinning method is proposed to deposit N-octyl-2-cyanoacrylate (NOCA) medical glue fibrous membrane on kidney for in-situ fast hemostasis. A metal electrode equipped to the spinning needle is used to confine the ergence angle of jet. Compared to the conventional electrospinning method, the fiber deposition area has reduced by 2.5 times, and it can achieve in-situ accurate deposition. Moreover, it reduces both the external dimension and over-reliance on electricity, which is superior to previous air-flow assisted electrospinning method. In addition, in situ accurate deposition of NOCA on the kidney exhibits fast hemostasis within 10 s, confirming that this auxiliary electrode method can be applied in outdoors for fast hemostasis. Further pathological studies indicate that this auxiliary electrode method can reduce the inflammatory response of tissues due to the better accurate deposition. This portable hand-held device with the auxiliary electrode method may have potential application in fast hemostasis for outdoors due to its accurate deposition and portability characteristics.
Publisher: American Chemical Society (ACS)
Date: 10-05-2018
Abstract: Photodetection based on two-dimensional (2D) SnS
Publisher: IOP Publishing
Date: 06-2019
DOI: 10.1088/1674-1056/28/6/064401
Abstract: Cordierite (Mg 2 Al 4 Si 5 O 18 ) is known for its good thermal shock resistance and it is widely used to improve thermal shock properties of materials. We found that cordierite has good infrared heat dissipation performance. This performance provides an additional means of heat dissipation to assist in the cooling of the metal surface. Spectroscopic tests show that cordierite reflects sunlight in the visible range and emits infrared in the far infrared range, making it potential candidate as an infrared radiative cooling material for daytime use.
Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 07-2019
DOI: 10.1016/J.BIOMATERIALS.2019.03.038
Abstract: Poly(propylene fumarate) (PPF) is a biodegradable polymer that has been investigated extensively over the last three decades. It has led many scientists to synthesize and fabricate a variety of PPF-based materials for biomedical applications due to its controllable mechanical properties, tunable degradation and biocompatibility. This review provides a comprehensive overview of the progress made in improving PPF synthesis, resin formulation, crosslinking, device fabrication and post polymerization modification. Further, we highlight the influence of these parameters on biodegradation, biocompatibility, and their use in a number of regenerative medicine applications, especially bone tissue engineering. In particular, the use of 3D printing techniques for the fabrication of PPF-based scaffolds is extensively reviewed. The recent invention of a ring-opening polymerization method affords precise control of PPF molecular mass, molecular mass distribution (Ɖ
Publisher: Trans Tech Publications, Ltd.
Date: 12-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.853.79
Abstract: Soft conductive elastomer materials have wide potential applications in material science and electronic engineering. Through electrospinning and in-situ polymerization, a kind of well-organized coaxial polyaniline olyvinylidence fluoride (PANI/PVDF) microfibers with conductivity about 0.6 S/cm were fabricated, which combined the advantages of conducting polymer and elastic material. It is found that the resistance of the fibers was changed with the curvature variation. The results indicate that the PANI/PVDF microfibers could be used as strain sensor with high flexibility, high sensitivity, and stable repeatability.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR01832F
Abstract: Stretchable strain sensors based on aligned microfibrous arrays of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)-poly(vinyl pyrrolidone) (PEDOT:PSS-PVP) with curled architectures have been fabricated by a novel reciprocating-type electrospinning setup with a spinneret in straightforward simple harmonic motion. The incorporation of PEDOT:PSS into PVP is confirmed by Raman spectra, which improves the room-temperature conductivity of the composite fibers (1.6 × 10(-5) S cm(-1)). Owing to the curled architectures of the as-spun fibrous polymer arrays, the sensors can be stretched reversibly with a linear elastic response to strain up to 4%, which is three times higher than that from electrospun nonwoven mats. In addition, the stretchable strain sensor with a high repeatability and durability has a gauge factor of about 360. These results may be helpful for the fabrication of stretchable devices which have potential applications in some fields such as soft robotics, elastic semiconductors, and elastic solar cells.
No related grants have been discovered for Yun-Ze Long.