ORCID Profile
0000-0003-1979-5213
Current Organisations
University of Wollongong
,
University of Duisburg-Essen
,
University of New South Wales
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Nanomaterials | Nanotechnology | Composite and Hybrid Materials | Medical Devices | Sensor Technology (Chemical aspects)
Diagnostic Methods | Renewable Energy not elsewhere classified | Synthetic Fibres, Yarns and Fabrics | Health Status (e.g. Indicators of Well-Being) | Health not elsewhere classified |
Publisher: MDPI AG
Date: 18-04-2017
DOI: 10.3390/S17040884
Publisher: Elsevier BV
Date: 02-2018
Publisher: American Chemical Society (ACS)
Date: 15-09-2016
Abstract: Highly stretchable, actuatable, electrically conductive knitted textiles based on Spandex (SPX)/CNT (carbon nanotube) composite yarns were prepared by an integrated knitting procedure. SPX filaments were continuously wrapped with CNT aerogel sheets and supplied directly to an interlocking circular knitting machine to form three-dimensional electrically conductive and stretchable textiles. By adjusting the SPX/CNT feed ratio, the fabric electrical conductivities could be tailored in the range of 870 to 7092 S/m. The electrical conductivity depended on tensile strain, with a linear and largely hysteresis-free resistance change occurring on loading and unloading between 0% and 80% strain. Electrothermal heating of the stretched fabric caused large tensile contractions of up to 33% and generated a gravimetric mechanical work capacity during contraction of up to 0.64 kJ/kg and a maximum specific power output of 1.28 kW/kg, which far exceeds that of mammalian skeletal muscle. The knitted textile provides the combination of strain sensing and the ability to control dimensions required for smart clothing that simultaneously monitors the wearer's movements and adjusts the garment fit or exerts forces or pressures on the wearer, according to needs. The developed processing method is scalable for the fabrication of industrial quantities of strain sensing and actuating smart textiles.
Publisher: Wiley
Date: 29-11-2018
Publisher: IOP Publishing
Date: 14-01-2021
Abstract: Smart materials are capable of recognising environmental stimuli, processing the information arising from the stimuli, and responding to it in an appropriate manner. It is well known that smart textiles provide some interesting possibilities in this regard. Consequently, smart textiles based on artificial muscles polymer actuators will provide a breakthrough to many areas including soft robotics, prosthetics, and healthcare for the benefit of humankind. Therefore, it is a worthy attempt to work on artificial muscle designs to aid them in applications. This paper presents the effect of fibre arrangement within a material structure for force and stroke generation. A method of fabrication, characterisation of actuating textiles was presented with experimental results. Most importantly, a modelling was carried out to develop equations to calculate the force and stroke of actuating textiles which has not been reported to date. A reasonable agreement was found between calculated and measured force/stroke curves of both woven and knitted textiles. The woven textile exhibited a force enhancement directly proportional to the number of actuators while retaining the same strain of the single actuator. Nonetheless, the force and strain of knitted textile were highly dependent on the number of wales and courses per unit length. The fabricated knitted textile showed a lesser strain than the single actuator with a force lification. However, the performance parameters of as fabricated knitted textiles were higher than the fabricated woven textile. Finally a practical applications, process for bulk manufacturing of silicone coated actuators was proposed to enable them in commercialised products and long length production. This study will enable developers to select the fibre architectures and suitable actuators to suit a particular end requirement.
Publisher: Springer International Publishing
Date: 2016
Publisher: Springer Science and Business Media LLC
Date: 17-08-2017
Publisher: MDPI AG
Date: 25-09-2017
DOI: 10.3390/NANO7100293
Publisher: IEEE
Date: 09-2019
Publisher: SPIE
Date: 09-05-2014
DOI: 10.1117/12.2046188
Publisher: American Chemical Society (ACS)
Date: 13-05-2020
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 04-2022
Publisher: Wiley
Date: 10-2020
Publisher: IOP Publishing
Date: 12-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM04406G
Publisher: Wiley
Date: 06-2021
Abstract: Multi‐therapy strategies that coexist in a single system for cancer therapy has a great clinical application potential. In this paper, with the aim of establishing a suitable implantable platform for multimodal chemo‐photothermal cancer therapy, we have fabricated a coaxial composite hydrogel fiber that facilitated prolonged release of Doxorubicin from core. Fibers also served as NIR‐absorbing mediators, via incorporation of Cu 2‐x Se nanoparticles in the shell, to facilitate chemo‐photothermal combinational effects. In vitro experiments exhibited excellent photo‐thermal properties of the fibers and exceptional cancer cell‐killing efficiency. Remarkably, in vivo antitumor experiments showed that Doxorubicin‐loaded coaxial hydrogel fibers containing Cu 2‐x Se nanoparticles had outstanding antitumor efficacy, compared with chemotherapy or photothermal application alone. Overall, the coaxial composite hydrogel fibers provided a safe and efficacious implantable platform for multimodal chemo‐photothermal therapy that could potentially be used to control the progression of cancer locally at the tumor site.
Publisher: Wiley
Date: 04-2014
DOI: 10.1111/AOR.12300
Abstract: Research into the development of artificial heart muscle has been limited to assembly of stem cell-derived cardiomyocytes seeded around a matrix, while nonbiological approaches to tissue engineering have rarely been explored. The aim of the study was to apply electrically contractile polymer-based actuators as cardiomyoplasty for positive inotropic support of the right ventricle. Complex trilayer polypyrrole (PPy) bending polymers for high-speed applications were generated. Bending motion occurred directly as a result of electrochemically driven charging and discharging of the PPy layers. In a rat model (n = 5), strips of polymers (3 × 20 mm) were attached and wrapped around the right ventricle (RV). RV pressure was continuously monitored invasively by direct RV cannulation. Electrical activation occurred simultaneously with either diastole (in order to evaluate the polymer's stand-alone contraction capacity group 1) or systole (group 2). In group 1, the pressure generation capacity of the polymers was measured by determining the area under the pressure curve (area under curve, AUC). In group 2, the RV pressure AUC was measured in complexes directly preceding those with polymer contraction and compared to RV pressure complexes with simultaneous polymer contraction. In group 1, the AUC generated by polymer contraction was 2768 ± 875 U. In group 2, concomitant polymer contraction significantly increased AUC compared with complexes without polymer support (5987 ± 1334 U vs. 4318 ± 691 U, P ≤ 0.01). Electrically contractile polymers are able to significantly augment right ventricular contraction. This approach may open new perspectives for myocardial tissue engineering, possibly in combination with fetal or embryonic stem cell-derived cardiomyocytes.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 16-11-2012
Abstract: Actuators are used to convert heat, light, or electricity into a twisting or tensile motion, and are often described as artificial muscles. Most materials that show actuation either provide larger forces with small- litude motions, such as the alloy NiTi, or provide larger motions with much less force, such as polymeric materials. Other problems with such actuators can include slow response times and short lifetimes. Lima et al. (p. 928 , see the Perspective by Schulz ) show that a range of guest-filled, twist-spun carbon nanotube yarns can be used for linear or torsional actuation, can solve the problems of speed and lifetime, and do not require electrolytes for operation.
Publisher: MDPI AG
Date: 14-11-2017
DOI: 10.3390/POLYM9110614
Publisher: IEEE
Date: 12-2020
Publisher: Wiley
Date: 13-05-2018
Abstract: In spite of remarkable improvements in cancer treatments and survivorship, cancer still remains as one of the major causes of death worldwide. Although current standards of care provide encouraging results, they still cause severe systemic toxicity and also fail in preventing recurrence of the disease. In order to address these issues, biomaterial-based implantable drug delivery systems (DDSs) have emerged as promising therapeutic platforms, which allow local administration of drugs directly to the tumor site. Owing to the unique properties of biopolymers, they have been used in a variety of ways to institute biodegradable implantable DDSs that exert precise spatiotemporal control over the release of therapeutic drug. Here, the most recent advances in biopolymer-based DDSs for suppressing tumor growth and preventing tumor recurrence are reviewed. Novel emerging biopolymers as well as cutting-edge polymeric microdevices deployed as implantable antitumor DDSs are discussed. Finally, a review of a new therapeutic modality within the field, which is based on implantable biopolymeric DDSs, is given.
Publisher: Wiley
Date: 15-10-2023
Publisher: Elsevier BV
Date: 07-2011
Publisher: IOP Publishing
Date: 24-08-2018
Publisher: American Association for the Advancement of Science (AAAS)
Date: 13-10-2011
Abstract: Rotary motors of conventional design can be rather complex and are therefore difficult to miniaturize previous carbon nanotube artificial muscles provide contraction and bending, but not rotation. We show that an electrolyte-filled twist-spun carbon nanotube yarn, much thinner than a human hair, functions as a torsional artificial muscle in a simple three-electrode electrochemical system, providing a reversible 15,000° rotation and 590 revolutions per minute. A hydrostatic actuation mechanism, as seen in muscular hydrostats in nature, explains the simultaneous occurrence of lengthwise contraction and torsional rotation during the yarn volume increase caused by electrochemical double-layer charge injection. The use of a torsional yarn muscle as a mixer for a fluidic chip is demonstrated.
Publisher: Elsevier BV
Date: 09-2009
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TB00052C
Abstract: A new generation of coaxial hydrogel fibers have been developed as biocompatible, and effective platform to deliver combination of drugs locally to the tumor site to enhance the efficacy of cancer treatment.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA15190F
Abstract: A hybrid electrically conductive polyester–graphene textile was fabricated as a high-performance smart textile for geotextile and/or heating element applications.
Publisher: IEEE
Date: 02-2010
Publisher: Wiley
Date: 07-04-2023
Abstract: Recent advances in wearable energy harvesting technology as solutions to occupational health and safety programs are presented. Workers are often exposed to harmful conditions—especially in the mining and construction industries—where chronic health issues can emerge over time. While wearable sensors technology can aid in early detection and long‐term exposure tracking, powering them and the associated risks are often an impediment for their widespread use, such as the need for frequent charging and battery safety. Repetitive vibration exposure is one such hazard, e.g., whole body vibration, yet it can also provide parasitic energy that can be harvested to power wearable sensors and overcome the battery limitations. This review can critically analyze the vibration effect on workers’ health, the limitations of currently available devices, explore new options for powering different personal protective equipment devices, and discuss opportunities and directions for future research. The recent progress in self‐powered vibration sensors and systems from the perspective of the underlying materials, applications, and fabrication techniques is reviewed. Lastly, the challenges and perspectives are discussed for reference to the researchers who are interested in self‐powered vibration sensors.
Publisher: Elsevier
Date: 2018
Publisher: Mary Ann Liebert Inc
Date: 12-2017
Abstract: The demands for new types of artificial muscles continue to grow and novel approaches are being enabled by the advent of new materials and novel fabrication strategies. Self-powered actuators have attracted significant attention due to their ability to be driven by elements in the ambient environment such as moisture. In this study, we demonstrate the use of twisted and coiled wet-spun hygroscopic chitosan fibers to achieve a novel torsional artificial muscle. The coiled fibers exhibited significant torsional actuation where the free end of the coiled fiber rotated up to 1155 degrees per mm of coil length when hydrated. This value is 96%, 362%, and 2210% higher than twisted graphene fiber, carbon nanotube torsional actuators, and coiled nylon muscles, respectively. A model based on a single helix was used to evaluate the torsional actuation behavior of these coiled chitosan fibers.
Publisher: Biodiversity Heritage Library
Date: 06-2010
DOI: 10.5962/P.361634
Publisher: Elsevier BV
Date: 09-2017
DOI: 10.1016/J.PAN.2017.06.001
Abstract: There has been minimal improvement in the prognosis of pancreatic cancer cases in the past 3 decades highlighting the crucial need for more effective therapeutic approaches. A drug delivery system capable of locally delivering high concentrations of chemotherapeutics directly at the site of the tumor is clearly required. The aim of this study was to fabricate and characterize the biophysical properties of gemcitabine-eluting wet-spun polymeric fibers for localized drug delivery applications. Fibers spun from alginate or chitosan solutions with or without the anticancer drug gemcitabine had a uniform surface area, were internally homogeneous and ranged from 50-120 μm in diameter. Drug encapsulation ranged from 13-52%, depending on the type and concentration of polymer used. Gemcitabine displayed first-order release kinetics where 64-82% of the loaded drug was rapidly released within the first 10 h followed by a sustained release over the next 134 h. A time dependent inhibition of ex vivo tumor spheroid growth and cell viability was observed after incubation with gemcitabine-loaded fibers but not control fibers. With further development these studies could lead to the manufacture of a safe and effective delivery system designed to combat non-resectable pancreatic cancer for which currently there is minimal chance of cure.
Publisher: Elsevier BV
Date: 10-2016
Publisher: Wiley
Date: 12-03-2016
DOI: 10.1002/POLB.24035
Publisher: Wiley
Date: 05-2021
Publisher: The Electrochemical Society
Date: 09-2016
DOI: 10.1149/MA2016-02/52/3872
Abstract: Dopamine (DA) is an important neurotransmitter in the central nervous system. Insufficient or excessive level of DA related to Schizophrenia and Parkinson diseases [ 1 ] . Therefore, early detection of DA represents a hot topic in biosensing field. Recently, electrochemical bio-sensor (ECB) based on carbon material has received a great attention as an inexpensive and simple analytical method with remarkable detection sensitivity for neurochemicals detection [ 1 ] . Therefore, ECB’s fabrication and structure have attracted researcher’s efforts to obtain higher sensitivity and highly selectivity simultaneously. Traditional film-based ECB have shown some disadvantages such as large sizes, random structure, time consuming for film fabrication and low efficient [ 2 ] . As a result, a new biosensor based on nano carbon material designed in a probe style has been considered as an excellent candidate for sensing stimulation as they have aligned and packed structure which provides a bridge for electrons transfer and that enhances electrical conductivity, also, fibres can be fabricated in small sizes which gives the ability to be implanted with low tissue damages, in addition, simplicity of handling and ability to be grafted with different materials [ 3 ] . The aim of this study is to develop hybrid multi wall carbon nanotube yarn due to fascinating properties for CNTs (i.e. high surface area, fast electron kinetics transfer, reduced electrode fouling, wide electrochemical potential window, bio-compatibility, grafting ability, and increased sensitivity and selectivity (high efficient)). In a typical bio-sensing system, DA has been used with ascorbic acid (AA) and uric acid (UA) (as coexistence compounds [ 4 ] ) for investigating both sensitivity and selectivity of the prepared CNT yarn via cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. CV and DPV results have demonstrated selective and sensitive detection of DA in a sea of AA and UA with the potential to be a promising probe bio-sensor for real-time measurement. References: 1. Jackowska, K. and P. Krysinski, New trends in the electrochemical sensing of dopamine. Analytical and Bioanalytical Chemistry, 2013. 405 (11): p. 3753-3771. 2. Zhao, J., et al., Carbon Nanotube Nanoweb–Bioelectrode for Highly Selective Dopamine Sensing. ACS Applied Materials & Interfaces, 2012. 4 (1): p. 44-48. 3. Hu, C. and S. Hu, Carbon Nanotube-Based Electrochemical Sensors: Principles and Applications in Biomedical Systems. Journal of Sensors, 2009. 2009 : p. 40. 4. Bi, H., et al., Carbon-nanotube-modified glassy carbon electrode for simultaneous determination of dopamine, ascorbic acid and uric acid: The effect of functional groups. Sensors and Actuators B: Chemical, 2012. 171–172 : p. 1132-1140. Figure 1
Publisher: American Association for the Advancement of Science (AAAS)
Date: 28-04-2021
DOI: 10.1126/SCIROBOTICS.ABF4788
Abstract: High-stroke and energy-dense artificial muscles are made by mimicking DNA’s ability to contract by supercoiling.
Publisher: Wiley
Date: 08-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2NR11580H
Abstract: Hybrid polypyrrole (PPy)-multi walled carbon nanotube (MWNT) yarns were obtained by chemical and electrochemical polymerization of pyrrole on the surface and within the porous interior of twisted MWNT yarns. The material was characterized by scanning electron microscopy, electrochemical, mechanical and electrical measurements. It was found that the hybrid PPy-MWNT yarns possessed significantly higher mechanical strength (over 740 MPa) and Young's modulus (over 54 GPa) than the pristine MWNT yarn. The hybrid yarns also exhibited substantially higher electrical conductivity (over 235 S cm(-1)) and their specific capacitance was found to be in excess of 60 F g(-1). Measurements of temperature dependence of electrical conductivity revealed semiconducting behaviour, with a large increase of band gap near 100 K. The collected low temperature data are in good agreement with a three-dimensional variable range hopping model (3D-VRH). The improved durability of the yarns is important for electrical applications. The composite yarns can be produced in commercial quantities and used for applications where the electrical conductivity and good mechanical properties are of primary importance.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA05626A
Abstract: This review provides a comprehensive picture of the history and latest developments in the field of conducting polymer fibres as well as their current/future applications.
Publisher: IOP Publishing
Date: 12-2019
Publisher: Wiley
Date: 16-02-2020
Publisher: Wiley
Date: 16-07-2014
Publisher: MDPI AG
Date: 13-12-2021
Abstract: With the aim of fabricating drug-loaded implantable patches, a 3D printing technique was employed to produce novel coaxial hydrogel patches. The core-section of these patches contained a dopamine-modified methacrylated alginate hydrogel loaded with a chemotherapeutic drug (Gemcitabine), while their shell section was solely comprised of a methacrylated alginate hydrogel. Subsequently, these patches were further modified with CaCO3 cross linker and a polylactic acid (PLA) coating to facilitate prolonged release of the drug. Consequently, the results showed that addition of CaCO3 to the formula enhanced the mechanical properties of the patches and significantly reduced their swelling ratio as compared to that for patches without CaCO3. Furthermore, addition of PLA coating to CaCO3-containing patches has further reduced their swelling ratio, which then significantly slowed down the release of Gemcitabine, to a point where 4-layered patches could release the drug over a period of 7 days in vitro. Remarkably, it was shown that 3-layered and 4-layered Gemcitabine loaded patches were successful in inhibiting pancreatic cancer cell growth for a period of 14 days when tested in vitro. Lastly, in vivo experiments showed that gemcitabine-loaded 4-layered patches were capable of reducing the tumor growth rate and caused no severe toxicity when tested in mice. Altogether, 3D printed hydrogel patches might be used as biocompatible implants for local delivery of drugs to diseased site, to either shrink the tumor or to prevent the tumor recurrence after resection.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR00408G
Abstract: Wearable energy storage devices are of practical interest, but few have been commercially exploited. Production of electrodes with extended cycle life, as well as high energy and power densities, coupled with flexibility, remains a challenge. Herein, we have demonstrated the development of a high-performance hybrid carbon nanotube (CNT) fiber-based supercapacitor for the first time using conventional wet-spinning processes. Manganese dioxide (MnO
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA90082H
Abstract: Correction for ‘Fabrication of a graphene coated nonwoven textile for industrial applications’ by Dharshika Kongahge et al. , RSC Adv. , 2016, 6 , 73203–73209.
Publisher: SPIE
Date: 26-03-2014
DOI: 10.1117/12.2046411
Publisher: American Association for the Advancement of Science (AAAS)
Date: 21-02-2014
Abstract: In designing materials for artificial muscles, the goals are to find those that will combine high strokes, high efficiency, long cycle life, low hysteresis, and low cost. Now, Haines et al. (p. 868 see the Perspective by Yuan and Poulin ) show that this is possible. Twisting high-strength, readily available polymer fibers, such as those used for fishing lines or sewing thread, to the point where they coil up, allowed construction of highly efficient actuators that could be triggered by a number of stimuli.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Frontiers Media SA
Date: 27-02-2020
Publisher: ICST
Date: 2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NA00038K
Abstract: Recent advances in artificial muscles based on twisted and coiled carbon nanotube yarns and graphene fibers.
Publisher: Wiley
Date: 30-07-2017
DOI: 10.1002/APP.45529
Publisher: MDPI AG
Date: 11-03-2019
DOI: 10.3390/FIB7030021
Abstract: Smart textiles based on actuator materials are of practical interest, but few types have been commercially exploited. The challenge for researchers has been to bring the concept out of the laboratory by working out how to build these smart materials on an industrial scale and permanently incorporate them into textiles. Smart textiles are considered as the next frontline for electronics. Recent developments in advance technologies have led to the appearance of wearable electronics by fabricating, miniaturizing and embedding flexible conductive materials into textiles. The combination of textiles and smart materials have contributed to the development of new capabilities in fabrics with the potential to change how athletes, patients, soldiers, first responders, and everyday consumers interact with their clothes and other textile products. Actuating textiles in particular, have the potential to provide a breakthrough to the area of smart textiles in many ways. The incorporation of actuating materials in to textiles is a striking approach as a small change in material anisotropy properties can be converted into significant performance enhancements, due to the densely interconnected structures. Herein, the most recent advances in smart materials based on actuating textiles are reviewed. The use of novel emerging twisted synthetic yarns, conducting polymers, hybrid carbon nanotube and spandex yarn actuators, as well as most of the cutting–edge polymeric actuators which are deployed as smart textiles are discussed.
Publisher: Elsevier
Date: 2020
Publisher: Frontiers Media SA
Date: 18-06-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA00227E
Abstract: Recent advances in smart textiles and wearable technologies based on piezoelectric fibers as wearable energy harvesters.
Publisher: IEEE
Date: 05-11-2020
Publisher: SPIE
Date: 18-04-2022
DOI: 10.1117/12.2612716
Publisher: Wiley
Date: 04-12-2022
Abstract: Carbon nanotube‐spandex textiles are rapidly gaining in popularity as sensors for human motion, yet their use as—and comparison to—viable clinical‐based instrumentation has not been thoroughly investigated. Herein, the use of novel yarn‐based sensors that show excellent characteristics, ideal for joint kinematic sensing, is described. Knee kinematic monitoring of nine healthy participants while walking on a treadmill is examined. This is enabled through a 3D‐printed knee brace integrated with a wireless transmission device. The design, development, and testing of the wearable device is presented along with wireless data capture and processing. Additionally, the findings are compared in vivo to those reported by a reference optoelectronic measurement system (KneeKG) for validation purposes. The results show a high correlation between both systems, with an average Pearson's r ‐value of 0.89 across each corresponding knee. This study is the first to explore the use of these novel yarn sensors for sagittal knee kinematic monitoring on participants during trials and validate the findings via an optoelectronic measurement system.
Publisher: Wiley
Date: 06-12-2020
Abstract: The ubiquity of wearables, coupled with the increasing demand for power, presents a unique opportunity for fiber‐based mobile energy generator systems. However, no commercially available systems currently exist with typical problems including low energy efficiency short cycle life slow and expensive manufacturing and stiff, heavy or bulky componentry that reduce wearer comfort and aesthetic appeal. Herein, a new method is demonstrated to create wearable energy generators and sensors using nanostructured hybrid polyvinylidene fluoride (PVDF)/reduced graphene oxide (rGO)/barium‐titanium oxide (BT) piezoelectric fibers and exploiting the enormous variety of textile architectures. Highly stretchable piezoelectric fibers based on coiled PVDF/rGO/BT fibers energy generator and sensor are developed. It is found that the coiled PVDF/ rGO/BT enables to stretch up to ≈100% strain that produces a peak voltage output of ≈1.3 V with a peak power density of 3 W Kg −1 which is 2.5 times higher than previously reported for piezoelectric textiles. An energy conversion efficiency of 22.5% is achieved for the coiled hybrid piezofiber energy generator. A prototype energy generator and sensors based on a hybrid piezofibers wearable device for energy harvesting and monitoring real time precise healthcare are demonstrated.
Publisher: Elsevier BV
Date: 02-2008
Publisher: Frontiers Media SA
Date: 20-02-2020
Publisher: MDPI AG
Date: 22-01-2021
Abstract: Flexible substrates have become essential in order to provide increased flexibility in wearable sensors, including polymers, plastic, paper, textiles and fabrics. This study is to comprehensively summarize the bending capabilities of flexible polymer substrate for general Internet of Things (IoTs) applications. The basic premise is to investigate the flexibility and bending ability of polymer materials as well as their tendency to withstand deformation. We start by providing a chronological order of flexible materials which have been used during the last few decades. In the future, the IoT is expected to support a erse set of technologies to enable new applications through wireless connectivity. For wearable IoTs, flexibility and bending capabilities of materials are required. This paper provides an overview of some abundantly used polymer substrates and compares their physical, electrical and mechanical properties. It also studies the bending effects on the radiation performance of antenna designs that use polymer substrates. Moreover, we explore a selection of flexible materials for flexible antennas in IoT applications, namely Polyimides (PI), Polyethylene Terephthalate (PET), Polydimethylsiloxane (PDMS), Polytetrafluoroethylene (PTFE), Rogers RT/Duroid and Liquid Crystal Polymer (LCP). The study includes a complete analysis of bending and folding effects on the radiation characteristics such as S-parameters, resonant frequency deviation and the impedance mismatch with feedline of the flexible polymer substrate microstrip antennas. These flexible polymer substrates are useful for future wearable devices and general IoT applications.
Publisher: Oxford University Press (OUP)
Date: 08-2008
DOI: 10.1017/S1431927608082871
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008
Publisher: American Association for the Advancement of Science (AAAS)
Date: 12-07-2019
Abstract: Although guest-filled carbon nanotube yarns provide record performance as torsional and tensile artificial muscles, they are expensive, and only part of the muscle effectively contributes to actuation. We describe a muscle type that provides higher performance, in which the guest that drives actuation is a sheath on a twisted or coiled core that can be an inexpensive yarn. This change from guest-filled to sheath-run artificial muscles increases the maximum work capacity by factors of 1.70 to 2.15 for tensile muscles driven electrothermally or by vapor absorption. A sheath-run electrochemical muscle generates 1.98 watts per gram of average contractile power-40 times that for human muscle and 9.0 times that of the highest power alternative electrochemical muscle. Theory predicts the observed performance advantages of sheath-run muscles.
Publisher: Wiley
Date: 12-03-2023
Abstract: Medical soft robotics constitutes a rapidly developing field in the treatment of cardiovascular diseases, with a promising future for millions of patients suffering from heart failure worldwide. Herein, the present state and future direction of artificial muscle‐based soft robotic biomedical devices in supporting the inotropic function of the heart are reviewed, focusing on the emerging electrothermally artificial heart muscles (AHMs). Artificial muscle powered soft robotic devices can mimic the action of complex biological systems such as heart compression and twisting. These artificial muscles possess the ability to undergo complex deformations, aiding cardiac function while maintaining a limited weight and use of space. Two very promising candidates for artificial muscles are electrothermally actuated AHMs and biohybrid actuators using living cells or tissue embedded with artificial structures. Electrothermally actuated AHMs have demonstrated superior force generation while creating the prospect for fully soft robotic actuated ventricular assist devices. This review will critically analyze the limitations of currently available devices and discuss opportunities and directions for future research. Last, the properties of the cardiac muscle are reviewed and compared with those of different materials suitable for mechanical cardiac compression.
Publisher: Elsevier BV
Date: 10-2012
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 09-2015
Publisher: Wiley
Date: 11-09-2020
Publisher: AIP Publishing
Date: 15-05-2010
DOI: 10.1063/1.3425793
Abstract: The mechanical and the electrical properties of polypyrrole (PPy) fibers and electrochemically deposited PPy films were studied. It was found that the PPy fibers showed a significantly higher strength than the PPy films due to better orientation of the molecular structure. The electrochemically prepared PPy films had a higher electrical conductivity than that of the fibers at high temperature. At low temperature, the PPy fibers showed the higher conductivity. The conductivity results were analyzed in the frame of the three-dimensional variable range hopping model. The results showed that at room temperature the average hopping distance for the fibers was about 4 Å while for the films it increases to about 5.7 Å. This corresponds to about 1 and 2 monomer units in length for the fiber and film s les, respectively.
Publisher: Elsevier BV
Date: 10-2017
Publisher: Wiley
Date: 04-05-2015
Publisher: Springer International Publishing
Date: 2016
Publisher: Elsevier BV
Date: 11-2018
Publisher: MDPI AG
Date: 16-11-2020
Abstract: The demands for wearable technologies continue to grow and novel approaches for powering these devices are being enabled by the advent of new energy materials and novel manufacturing strategies. In addition, decreasing the energy consumption of portable electronic devices has created a huge demand for the development of cost-effective and environment friendly alternate energy sources. Energy harvesting materials including piezoelectric polymer with its special properties make this demand possible. Herein, we develop a flexible and lightweight nanogenerator package based on polyvinyledene fluoride (PVDF)/LiCl electrospun nanofibers. The piezoelectric performance of the developed nanogenator is investigated to evaluate effect of the thickness of the as-spun mat on the output voltage using a vibration and impact test. It is found that the output voltage increases from 1.3 V to 5 V by adding LiCl as additive into the spinning solution compared with pure PVDF. The prepared PVDF/LiCl nanogenerator is able to generate voltage and current output of 3 V and 0.5 μA with a power density output of 0.3 μW cm−2 at the frequency of 200 Hz. It is found also that the developed nanogenerator can be utilized as a sensor to measure temperature changes from 30 °C to 90 °C under static pressure. The developed electrospun temperature sensor showed sensitivity of 0.16%/°C under 100 Pa pressure and 0.06%/°C under 220 Pa pressure. The obtained results suggested the developed energy harvesting textiles have promising applications for various wearable self-powered electrical devices and systems.
Publisher: Springer Singapore
Date: 2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2013
Publisher: ASTES Journal
Date: 2020
DOI: 10.25046/AJ050592
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA90118B
Abstract: Correction for ‘Developments in conducting polymer fibres: from established spinning methods toward advanced applications’ by Azadeh Mirabedini et al. , RSC Adv. , 2016, 6 , 44687–44716.
Publisher: Wiley
Date: 22-07-2016
Publisher: Wiley
Date: 07-07-2015
Publisher: Elsevier BV
Date: 05-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA10964H
Abstract: A new strategy of a triaxial architecture based on piezoelectric fibers, silver coated nylon and braiding technology as a wearable energy harvesting generator.
Publisher: Wiley
Date: 14-06-2019
Publisher: Elsevier BV
Date: 02-2021
Publisher: SPIE
Date: 09-05-2014
DOI: 10.1117/12.2045270
Publisher: American Association for the Advancement of Science (AAAS)
Date: 29-01-2021
Abstract: Carbon nanotube yarns can be used as electrochemical actuators because infiltration with ions causes a contraction in length and an expansion in diameter. Either positive or negative ions can cause this effect. Chu et al. constructed an all-solid-state muscle that eliminated the need for an electrolyte bath, which may expand the potential for its use in applications. By infiltrating the yarns with charged polymers, the fibers start partially swollen, so the length can increase through the loss of ions. It is thus possible to increase the overall stroke of the muscle. Further, these composite materials show a surprising increase in stroke with scan rate. Science , this issue p. 494
Publisher: MDPI AG
Date: 20-11-2020
DOI: 10.3390/S20226661
Abstract: There is a significant nascent market for ethically produced products with enormous commercial potential around the world. A reliable method to signal the provenance of products is therefore critical for industry, given that competition based on price is not a viable strategy. The ability to trace and signal ethical treatment of animals is also of significant value to textiles manufactures. The efficacy of such a method can be measured with respect to the cost of implementation, scalability, and the difficulty of counterfeiting. The key to traceability is to win the trust of the consumer about the veracity of this information. Wearable sensors make it possible to monitor and improve the management of traceability and/or provenance. In this paper, we introduce a method for signalling the provenance of garments using radio frequency watermarks. The proposed model consists of two levels of authentication that are easy to use by legitimate vendors, but extremely difficult to imitate or hack, because the watermark is built-in and based on the radiation signature of electroactive materials.
Publisher: Wiley
Date: 29-12-2018
Publisher: IEEE
Date: 12-2019
Publisher: Springer Singapore
Date: 2015
Publisher: Elsevier BV
Date: 12-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA07226G
Abstract: Effects of carbon nanotubes and/or conducting polymer on electrical and electrochemical properties of wet spun graphene fibres were demonstrated.
Publisher: Elsevier
Date: 2020
Publisher: Wiley
Date: 10-2014
Publisher: IOP Publishing
Date: 14-12-2016
Publisher: Hindawi Limited
Date: 2017
DOI: 10.1155/2017/5750907
Publisher: Springer Science and Business Media LLC
Date: 07-09-2023
Publisher: MDPI AG
Date: 22-12-2020
DOI: 10.3390/NANO11010003
Abstract: The ubiquity of wearables, coupled with the increasing demand for power, presents a unique opportunity for nanostructured fiber-based mobile energy storage systems. When designing wearable electronic textiles, there is a need for mechanically flexible, low-cost and light-weight components. To meet this demand, we have developed an all-in-one fiber supercapacitor with a total thickness of less than 100 μm using a novel facile coaxial wet-spinning approach followed by a fiber wrapping step. The formed triaxial fiber nanostructure consisted of an inner poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) core coated with an ionically conducting chitosan sheath, subsequently wrapped with a carbon nanotube (CNT) fiber. The resulting supercapacitor is highly flexible, delivers a maximum energy density 5.83 Wh kg−1 and an extremely high power of 1399 W kg−1 along with remarkable cyclic stability and specific capacitance. This asymmetric all-in-one fiber supercapacitor may pave the way to a future generation of wearable energy storage devices.
Publisher: MDPI AG
Date: 11-06-2022
DOI: 10.3390/MA15124153
Abstract: An investigation into the addition of different weight percentages of Fe3O4 nanoparticles to find the optimum wt.% and its effect on the microstructure, thermal, magnetic, and electrical properties of aluminum matrix composite was conducted using the powder metallurgy method. The purpose of this research was to develop magnetic properties in aluminum. Based on the obtained results, the value of density, hardness, and saturation magnetization (Ms) from 2.33 g/cm3, 43 HV and 2.49 emu/g for Al-10 Fe3O4 reached a maximum value of 3.29 g/cm3, 47 HV and 13.06 emu/g for the Al-35 Fe3O4 which showed an improvement of 41.2%, 9.3%, and 424.5%, respectively. The maximum and minimum coercivity (Hc) was 231.87 G for Al-10 Fe3O4 and 142.34 G for Al-35 Fe3O4. Moreover, the thermal conductivity and electrical resistivity at a high weight percentage (35wt.%) were 159 w/mK, 9.9 × 10−4 Ω·m, and the highest compressive strength was 133 Mpa.
Publisher: American Chemical Society (ACS)
Date: 16-12-2019
Publisher: MDPI AG
Date: 23-08-2021
DOI: 10.3390/NANO11082153
Abstract: Piezoelectric fibers have an important role in wearable technology as energy generators and sensors. A series of hybrid nanocomposite piezoelectric fibers of polyinylidene fluoride (PVDF) loaded with barium–titanium oxide (BT) and reduced graphene oxide (rGO) were prepared via the melt spinning method. Our previous studies show that high-performance fibers with 84% of the electroactive β-phase in the PVDF generated a peak output voltage up to 1.3 V and a power density of 3 W kg−1. Herein, the dynamic mechanical and creep behavior of these fibers were investigated to evaluate their durability and piezoelectric performance. Dynamic mechanical analysis (DMA) was used to provide phenomenological information regarding the viscoelastic properties of the fibers in the longitudinal direction. DSC and SEM were employed to characterize the crystalline structure of the s les. The storage modulus and the loss tangent increased by increasing the frequency over the temperature range (−50 to 150 °C) for all of the fibers. The storage modulus of the PVDF/rGO nanocomposite fibers had a higher value (7.5 GPa) in comparison with other fibers. The creep and creep recovery behavior of the PVDF/nanofillers in the nanocomposite fibers have been explored in the linear viscoelastic region at three different temperatures (10–130 °C). In the PVDF/rGO nanocomposite fibers, strong sheet/matrix interfacial interaction restricted the mobility of the polymer chains, which led to a higher modulus at temperatures 60 and 130 °C.
Publisher: Elsevier BV
Date: 09-2019
DOI: 10.1016/J.BIOMATERIALS.2019.05.025
Abstract: Given their native-like biological properties, high growth factor retention capacity and porous nature, sulfated-polysaccharide-based scaffolds hold great promise for a number of tissue engineering applications. Specifically, as they mimic important properties of tissues such as bone and cartilage they are ideal for orthopaedic tissue engineering. Their biomimicry properties encompass important cell-binding motifs, native-like mechanical properties, designated sites for bone mineralisation and strong growth factor binding and signaling capacity. Even so, scientists in the field have just recently begun to utilise them as building blocks for tissue engineering scaffolds. Most of these efforts have so far been directed towards in vitro studies, and for these reasons the clinical gap is still substantial. With this review paper, we have tried to highlight some of the important chemical, physical and biological features of sulfated-polysaccharides in relation to their chondrogenic and osteogenic inducing capacity. Additionally, their usage in various in vivo model systems is discussed. The clinical studies reviewed herein paint a promising picture heralding a brave new world for orthopaedic tissue engineering.
Publisher: Wiley
Date: 27-01-2021
Start Date: 04-2013
End Date: 12-2017
Amount: $375,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 08-2022
End Date: 07-2027
Amount: $5,000,000.00
Funder: Australian Research Council
View Funded Activity