ORCID Profile
0000-0002-3259-9295
Current Organisations
Universiteit Twente
,
University of Dublin Trinity College
,
University of Wollongong - Innovation Campus
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Research Topics
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.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Nanotechnology | Biomaterials | Physical Chemistry (Incl. Structural) | Biochemistry and Cell Biology | Macromolecular and Materials Chemistry | Synthesis of Materials | Condensed Matter Physics | Biomedical Engineering | Microbiology | Nanochemistry and Supramolecular Chemistry | Electrochemistry | Composite Materials | Structural Chemistry and Spectroscopy | Materials Engineering not elsewhere classified | Medical Biochemistry and Metabolomics not elsewhere classified | Optical Physics not elsewhere classified | Organometallic Chemistry | Nanomanufacturing | Physical Chemistry Not Elsewhere Classified | Functional Materials | Medical Virology | Virology | Materials Engineering | Medicinal and Biomolecular Chemistry not elsewhere classified | Diagnostic Applications | Surfaces and Structural Properties of Condensed Matter | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Cell Neurochemistry
ANZSRC Socio-Economic Objective (SEO)
Medical instrumentation | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Biological Sciences | Other | Energy storage | Solar-photoelectric | Infectious diseases | Biological sciences | Ceramics, Glass and Industrial Mineral Products not elsewhere classified | Chemical sciences | Expanding Knowledge in the Medical and Health Sciences | Physical sciences | Expanding Knowledge in Technology | Fabricated Metal Products not elsewhere classified | Energy Storage (excl. Hydrogen) | Human Pharmaceutical Treatments (e.g. Antibiotics) | Prevention—biologicals (e.g. vaccines) | Treatments (e.g. chemicals, antibiotics) |
Related Links
Publications
3D printing of layered brain-like structures using peptide modified gellan gum substrates
Publisher: Elsevier BV
Date: 10-2015
DOI: 10.1016/J.BIOMATERIALS.2015.07.022
Abstract: The brain is an enormously complex organ structured into various regions of layered tissue. Researchers have attempted to study the brain by modeling the architecture using two dimensional (2D) in vitro cell culturing methods. While those platforms attempt to mimic the in vivo environment, they do not truly resemble the three dimensional (3D) microstructure of neuronal tissues. Development of an accurate in vitro model of the brain remains a significant obstacle to our understanding of the functioning of the brain at the tissue or organ level. To address these obstacles, we demonstrate a new method to bioprint 3D brain-like structures consisting of discrete layers of primary neural cells encapsulated in hydrogels. Brain-like structures were constructed using a bio-ink consisting of a novel peptide-modified biopolymer, gellan gum-RGD (RGD-GG), combined with primary cortical neurons. The ink was optimized for a modified reactive printing process and developed for use in traditional cell culturing facilities without the need for extensive bioprinting equipment. Furthermore the peptide modification of the gellan gum hydrogel was found to have a profound positive effect on primary cell proliferation and network formation. The neural cell viability combined with the support of neural network formation demonstrated the cell supportive nature of the matrix. The facile ability to form discrete cell-containing layers validates the application of this novel printing technique to form complex, layered and viable 3D cell structures. These brain-like structures offer the opportunity to reproduce more accurate 3D in vitro microstructures with applications ranging from cell behavior studies to improving our understanding of brain injuries and neurodegenerative diseases.
Highly stretchable conducting SIBS-P3HT fibers
Publisher: Wiley
Date: 18-01-2011
A Microscopic and Spectroscopic Study of Interactions between Carbon Nanotubes and a Conjugated Polymer
Publisher: American Chemical Society (ACS)
Date: 08-02-2002
DOI: 10.1021/JP013745F
Performance evaluation of a humpback whale-inspired hydrofoil design applied to surfboard fins
Publisher: IEEE
Date: 10-2019
Inkjet printing of self-assembling polyelectrolyte hydrogels
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0SM01276A
Reinforcement of macroscopic carbon nanotube structures by polymer intercalation: The role of polymer molecular weight and chain conformation
Publisher: American Physical Society (APS)
Date: 21-12-2005
Recovery from applied strain in interpenetrating polymer network hydrogels with ionic and covalent cross-links
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2SM26745D
Diffusion of vitamin B<inf>12</inf> in gellan gum-carbon nanotube hydrogels
Publisher: IEEE
Date: 02-2010
Reinforcing biopolymer hydrogels with ionic-covalent entanglement hydrogel microspheres
Publisher: Wiley
Date: 04-03-2014
DOI: 10.1002/APP.40557
Printed organic electronic device components from edible materials
Publisher: Springer Science and Business Media LLC
Date: 2015
DOI: 10.1557/OPL.2015.17
Abstract: The electrical and mechanical characteristics of ionic-covalent entanglement hydrogels consisting of combinations of the edible biopolymers gellan gum and gelatin were investigated. Impedance analysis and compression testing showed that these hydrogels (with water content = 97%) exhibited conductivity values of up to 13 mS/cm and compressive stress at failure values of up to 1.0 MPa. These are suitable characteristics for printed and mechanically robust wet device components.
Celery Electronics
Publisher: Springer Science and Business Media LLC
Date: 03-2020
DOI: 10.1557/ADV.2020.133
A comparison of chemical and electrochemical synthesis of PEDOT: Dextran sulphate for bio-application
Publisher: Springer Science and Business Media LLC
Date: 2015
DOI: 10.1557/OPL.2015.19
Abstract: Poly(3,4-ethylenedioxythiophene) (PEDOT) is an organic conducting polymer that has been the focus of significant research over the last decade, in both energy and biological applications. Most commonly, PEDOT is doped by the artificial polymer polystyrene sulfonate due to the excellent electrical characteristics yielded by this pairing. The biopolymer dextran sulphate (DS) has been recently reported as a promising alternative to PEDOT:PSS for biological application, having electrical properties rivaling PEDOT:PSS, complimented by the potential bioactivity of the polysaccharide. In this work we compared chemical and electrochemical polymerisations of PEDOT:DS in terms of their impact on the electrical, morphological and biological properties of the resultant PEDOT:DS films. Post-growth cyclic voltammograms and UV-Vis analyses revealed comparable redox behaviour and absorbance profiles for the two synthesis approaches. Despite good intrinsic conductivity of particles, the addition of chemically produced PEDOT:DS did not markedly enhance the bulk conductivity of aqueous solutions due to the lack of interconnectivity between adjacent PEDOT:DS particles at achievable concentrations. Scanning electron microscopy revealed significantly greater roughness in films cast from chemically produced PEDOT:DS compared to electropolymerised s les, attributable to the formation of solution phase nanoparticles prior to casting. In cell studies with the L929 cell line, electrochemical polymerisation of PEDOT:DS afforded better integrity of resultant films for surface seeding, whilst chemically polymerised PEDOT:DS appeared to localised at the proliferating cells, suggesting possible applications in drug delivery.
Development of a facile one-pot synthesis method for an ingestible pH sensitive actuator
Publisher: Springer Science and Business Media LLC
Date: 03-2020
DOI: 10.1557/ADV.2019.370
Self-assembled gels from biological and synthetic polyelectrolytes
Publisher: Springer Science and Business Media LLC
Date: 2012
DOI: 10.1557/OPL.2012.857
Abstract: Inkjet printing of alternate layers of anionic and cationic polyelectrolytes allows organized gels to form with structures similar to those made by layer--by-layer dipping methods but very much faster. Structures of gels formed using slow and fast inkjet printing systems are compared using elemental analysis, swelling and diffusion kinetics as characterization methods. After printing and washing, most sodium or chloride counter-ions are last from the gel, leave only the polymer complex. The swelling properties of the printed and washed gel depend on the deposition rate and on the ratio of the two polymers as originally printed. The synthetic polyelectrolytes reported here can be compared with biological polyelectrolytes reported earlier by us.
3D/4D Printing Hydrogel Composites: A Pathway to Functional Devices
Publisher: Springer Science and Business Media LLC
Date: 11-12-2016
DOI: 10.1557/ADV.2015.9
Vaccine Delivery by Carbon Nanotubes
Publisher: Elsevier BV
Date: 10-2003
4D printing with mechanically robust, thermally actuating hydrogels
Publisher: Wiley
Date: 10-04-2015
Abstract: A smart valve is created by 4D printing of hydrogels that are both mechanically robust and thermally actuating. The printed hydrogels are made up of an interpenetrating network of alginate and poly(N-isopropylacrylamide). 4D structures are created by printing the "dynamic" hydrogel ink alongside other static materials.
Numerical CFD Investigation of Shortboard Surfing: Fin Design vs. Cutback Turn Performance
Publisher: MDPI
Date: 15-06-2020
Poly(3,4-ethylenedioxythiophene):dextran sulfate (PEDOT:DS) – A highly processable conductive organic biopolymer
Publisher: Elsevier BV
Date: 03-2015
Elastic conducting carbon nanotube-laden SIBS fibers
Publisher: IEEE
Date: 02-2010
Synthesis, properties and water permeability of SWNT buckypapers
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM31382K
Direct lipid profiling of single cells from inkjet printed microarrays
Publisher: American Chemical Society (ACS)
Date: 07-11-2012
DOI: 10.1021/AC302634U
Abstract: The on-demand printing of living cells using inkjet technologies has recently been demonstrated and allows for the controlled deposition of cells in microarrays. Here, we show that such arrays can be interrogated directly by robot-controlled liquid microextraction coupled with chip-based nanoelectospray mass spectrometry. Such automated analyses generate a profile of abundant membrane lipids that are characteristic of cell type. Significantly, the spatial control in both deposition and extraction steps combined with the sensitivity of the mass spectrometric detection allows for robust molecular profiling of in idual cells.
Hydrogel electrode materials
Publisher: IEEE
Date: 12-2010
Solubility and purity of nanotubes in arc discharge carbon powder
Publisher: Elsevier BV
Date: 03-2001
Conducting hydrogels for edible electrodes
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TB01247K
Abstract: Conducting hydrogels prepared from edible, commercially available materials were shown to function as capacitive pressure sensors.
Electrical and mechanical characteristics of buckypapers and evaporative cast films prepared using single and multi-walled carbon nanotubes and the biopolymer carrageenan
Publisher: Elsevier BV
Date: 03-2012
Conducting composite materials from the biopolymer kappa-carrageenan and carbon nanotubes
Publisher: Beilstein Institut
Date: 23-05-2012
DOI: 10.3762/BJNANO.3.48
Abstract: Conducting composite films containing carbon nanotubes (CNTs) were prepared by using the biopolymer kappa-carrageenan (KC) as a dispersant. Rheological studies indicated that 0.5% w/v was the appropriate KC concentration for dispersing CNTs. Our results showed that multiwalled nanotubes (MWNTs) required less sonic energy than single-walled nanotubes (SWNTs) for the dispersion process to be complete. Films prepared by vacuum filtration exhibited higher conductivity and improved mechanical characteristics compared to those prepared by evaporative casting. All composite films displayed sensitivity to water vapour, but MWNT films were more sensitive than SWNT films.
3D printing of surgical staples
Publisher: Springer Science and Business Media LLC
Date: 20-05-2022
DOI: 10.1557/S43580-022-00287-2
Abstract: In this work, CAD design and additive manufacturing (3D printing) are used to fabricate surgical staples. The staples were analysed on their mechanical robustness according to ASTM standard F564-17 which involved the in-house design, prototyping and fabrication (using 3D printing) of specialized grips and extension blocks. Our results indicated that staples 3D printed using carbon fibre reinforced nylon 6 (CF-PA6) exhibited a strength value of 37 ± 3 MPa coupled with an implantation-suitable ductility value of 26 ± 4%. The mechanical robustness of CF-PA6 staples subjected to immersion in simulated body fluid resulted in a reduction in stiffness and strength of 40% and 70% over 5 weeks, respectively. The carbon fibre nylon composite staples were able to handle a load of 15 kg and 5 kg prior and following immersion in simulated body fluid, respectively. Graphical abstract
Carbon Nanotube Mediated Reduction in Optical Activity in Polyaniline Composite Materials
Publisher: American Chemical Society (ACS)
Date: 16-01-2008
DOI: 10.1021/JP077117V
Selective Interaction in a Polymer−Single-Wall Carbon Nanotube Composite
Publisher: American Chemical Society (ACS)
Date: 18-12-2002
DOI: 10.1021/JP026470S
An overview of the suitability of hydrogel-forming polymers for extrusion-based 3D-printing
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TB00393H
Abstract: In this review hydrogel-forming polymers that are suitable for extrusion-based 3D printing are evaluated.
Additive Manufacturing, Modeling and Performance Evaluation of 3D Printed Fins for Surfboards
Publisher: Springer Science and Business Media LLC
Date: 31-01-2017
DOI: 10.1557/ADV.2017.107
Abstract: We demonstrate that Additive Manufacturing (3D printing) is a viable approach to rapidly prototype personalised fins for surfboards. Surfing is an iconic sport that is extremely popular in coastal regions around the world. We use computer aided design and 3D printing of a wide range of composite materials to print fins for surfboards, e.g. ABS, carbon fibre, fibre glass and amorphous thermoplastic poly(etherimide) resins. The mechanical characteristics of our 3D printed fins were found to be comparable to commercial fins. Computational fluid dynamics was employed to calculate longitudinal (drag) and tangential (turning) forces, which are important for surfboard maneuverability, stability and speed. A commercial tracking system was used to evaluate the performance of 3D printed fins under real-world conditions (i.e. surfing waves). These data showed that the surfing performance of surfboards with 3D printed fins is similar to that of surfboards with commercial fins.
Printed hydrogel materials
Publisher: IEEE
Date: 02-2010
Printing nanomaterials using non-contact printing
Publisher: IEEE
Date: 02-2010
Atomistic Simulations with Carbon Nanotubes - Classical, Quantum, and Transport Modeling
Publisher: Wiley
Date: 09-2002
DOI: 10.1002/1521-3951(200209)233:1<49::AID-PSSB49>3.0.CO;2-8
Inkjet and extrusion printing of conducting poly(3,4-ethylenedioxythiophene) tracks on and embedded in biopolymer materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0JM03587D
Optimisation of the arc-discharge production of multi-walled carbon nanotubes
Publisher: Elsevier BV
Date: 05-2002
Conducting bio-materials based on gellan gum hydrogels
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B909795C
Microscopic calculations of linear and quadratic optical response in model Langmuir–Blodgett multilayers
Publisher: AIP Publishing
Date: 15-04-2000
DOI: 10.1063/1.481238
Abstract: Microscopic calculations are reported of linear and quadratic nonlinear optical response in Langmuir–Blodgett films. The films are modeled as ordered layers of molecules that can tilt from the vertical and have a higher polarizability and first hyperpolarizability in the head than in the tail. The local electric field varies little after the first layer and negligibly after the second, which simplifies the analysis. Tilted two-layer Y-type films can have quadratic susceptibility components as large as X- or Z-type ones. Overall the results provide a systematic account of the linear and nonlinear optical properties as a function of molecular and film structure that should assist interpretation of experimental results.
3D Printed Flexure Hinges for Soft Monolithic Prosthetic Fingers
Publisher: Mary Ann Liebert Inc
Date: 09-2016
Mechanical reinforcement of continuous flow spun polyelectrolyte complex fibers
Publisher: Wiley
Date: 04-2009
Abstract: A simple continuous flow wet-spinning method to achieve mechanical reinforcement of the two oppositely charged biopolymers chitosan and gellan gum is described. The mechanical properties of these biopolymers are influenced by the order of addition. Using a facile method for mechanical reinforcement of gellan gum/chitosan fibers resulted in increases in Young's modulus, tensile strength, and toughness. Spinning gellan gum into chitosan resulted in the strongest fibers. We show that our fibers can provide a mechanical alternative for bio-fibers without the need of cross-linking. It is demonstrated that the fibers become ionically conducting in the presence of water vapor.
Gel–carbon nanotube materials: the relationship between nanotube network connectivity and conductivity
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0NR00259C
Abstract: The electrical resistance of carbon nanotube networks (NNs) prepared from combinations of gellan gum, xanthan gum, Triton X-100, SWNT and MWNT is reported. It is demonstrated that the NN conductivity can be obtained by analysing the resistance of two overlapping NN as a function of their overlap distance. Unexpectedly, the connectivity between two overlapping NN was found to scale with the electrical conductivity over 4 orders of magnitude. Insights into the dependence of inter-NN contact on applied pressure were obtained.
Fabrication of carbon nanotube-based microcapsules by a colloid templating technique
Publisher: IOP Publishing
Date: 29-06-2005
Metallic Iron Effects on Coke Analog Carbon Bonding and Reactivity
Publisher: Wiley
Date: 18-04-2017
3D Printed Edible Hydrogel Electrodes
Publisher: Springer Science and Business Media LLC
Date: 11-12-2016
DOI: 10.1557/ADV.2015.10
Strain and Pressure Gauges from Tough, Conducting and Edible Hydrogels
Publisher: Springer Science and Business Media LLC
Date: 2015
DOI: 10.1557/OPL.2015.572
Abstract: The development of highly conductive, robust edible hydrogels was investigated using a combination of the biopolymers gellan gum and gelatin, a common salt (NaCl) and plant-derived cross-linker (genipin). Robust strain gauge ressure sensors were developed using edible materials to demonstrate the potential of these hydrogels. The hydrogels exhibited gauge factor and pressure sensitivity values of 7.6 ± 0.1 and 400 ± 7 μΩ/Pa for loads up to 3 kPa, respectively. Furthermore, these devices were able to operate under larger loads with gauge factor and pressure sensitivity values of 0.308 ± 0.002 and 7.17 ± 0.05 μΩ/Pa, respectively, for loads between 9 kPa and 280 kPa.
Nano Patterning and Manipulation of Genetically Engineered Virus Nanoblocks
Publisher: Oxford University Press (OUP)
Date: 08-2004
DOI: 10.1017/S1431927604885441
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.
A Soft Stretchable Sensor: Towards Peripheral Nerve Signal Sensing
Publisher: Springer Science and Business Media LLC
Date: 20-02-2018
DOI: 10.1557/ADV.2018.220
Characterization of gellan gum by capillary electrophoresis
Publisher: CSIRO Publishing
Date: 2012
DOI: 10.1071/CH12211
Abstract: Gellan gums were characterised for the first time using free-solution capillary electrophoresis (CE) or CE under critical conditions (CE-CC). CE-CC is a fast method that separates the polysaccharide. Gellan gums are shown to be heterogeneous in terms of their electrophoretic mobility at 55°C revealing: oligomer peak(s), broad peaks of polymers with a random coil conformation with different degrees of acylation (composition), aggregates, and polymers with double-helix conformation. CE-CC is complementary with the rheological analysis also performed in this work. Sonication of gellan gums is shown to decrease the viscosity of gellan gum mainly by breaking up aggregates. The effect of sonication is stronger on the high-acyl gellan gum since the latter has a far higher tendency to aggregate.
Strain sensors based on conducting poly(acrylamide) hydrogels
Publisher: Springer Science and Business Media LLC
Date: 03-2020
DOI: 10.1557/ADV.2020.112
Field Research and Numerical CFD Analysis of Humpback Whale-Inspired Shortboard Fins
Publisher: MDPI
Date: 15-06-2020
Conducting carbon nanofibre networks: Dispersion optimisation, evaporative casting and direct writing
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3RA43743D
Distributed response analysis of conductive behavior in single molecules
Publisher: Proceedings of the National Academy of Sciences
Date: 30-04-2002
Abstract: The ab initio computational approach of distributed response analysis is used to quantify how electrons move across conjugated molecules in an electric field, in analogy to conduction. The method promises to be valuable for characterizing the conductive behavior of single molecules in electronic devices.
Polyelectrolyte complex materials from chitosan and gellan gum
Publisher: Elsevier BV
Date: 08-2011
Covalent attachment of a ruthenium complex to multiwall carbon nanotubes
Publisher: SPIE
Date: 17-03-2003
DOI: 10.1117/12.463904
Disulphide crosslinked star block copolypeptide hydrogels: influence of block sequence order on hydrogel properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8PY00741A
Abstract: Strong redox responsive hydrogels with mechanical properties depending on the positioning of oligo(cysteine) within the star polypeptides were obtained.
Bacterial Filtration Using Carbon Nanotube/Antibiotic Buckypaper Membranes
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/781212
Abstract: The preparation of free-standing carbon nanotube “buckypaper” (BP) membranes consisting of either single-walled carbon nanotubes (SWNTs) or multi-walled carbon nanotubes (MWNTs), and the antibiotic ciprofloxacin (cipro), is reported. The electrical, mechanical and morphological properties of these membranes have been characterised and are compared to those of the corresponding buckypaper membranes containing the surfactant Triton X-100 (Trix). Analysis of scanning electron microscopic images of the surfaces of SWNT/cipro and SWNT/Trix (Trix = Triton X-100) buckypapers revealed that the diameter of their surface pores was significantly smaller than that of the corresponding materials prepared using MWNTs. Similarly, the average internal pore diameter of both SWNT buckypapers was found to be smaller than that of their MWNT counterparts, after analysis of binding isotherms derived from nitrogen adsorption/desorption measurements performed on the materials. All four buckypaper membranes examined were found to be % effective for removing Escherichia coli ( E. coli ) from aqueous suspensions. However, buckypapers containing ciprofloxacin outperformed their counterparts containing the surfactant. Both MWNT buckypapers were more effective at preventing passage of E. coli than their analogues containing SWNTs, while fluorescence microscopic examination of stained membrane surfaces demonstrated that buckypapers composed of SWNTs had greater bactericidal properties.
Strong tough gels for 3D tissue constructs
Publisher: Springer Science and Business Media LLC
Date: 2014
DOI: 10.1557/OPL.2014.249
Abstract: The mechanical characteristics of ionic-covalent entanglement hydrogels consisting of combinations of the biopolymers gellan gum and kappa-carrageenan, and the synthetic polymers polyacrylamide and an epoxy amine were investigated. Compression testing showed that these gels exhibited “double network” behavior, i.e. strong tough gels.
Self‐Healing Hydrogels
Publisher: Wiley
Date: 04-08-2016
Abstract: Over the past few years, there has been a great deal of interest in the development of hydrogel materials with tunable structural, mechanical, and rheological properties, which exhibit rapid and autonomous self-healing and self-recovery for utilization in a broad range of applications, from soft robotics to tissue engineering. However, self-healing hydrogels generally either possess mechanically robust or rapid self-healing properties but not both. Hence, the development of a mechanically robust hydrogel material with autonomous self-healing on the time scale of seconds is yet to be fully realized. Here, the current advances in the development of autonomous self-healing hydrogels are reviewed. Specifically, methods to test self-healing efficiencies and recoveries, mechanisms of autonomous self-healing, and mechanically robust hydrogels are presented. The trends indicate that hydrogels that self-heal better also achieve self-healing faster, as compared to gels that only partially self-heal. Recommendations to guide future development of self-healing hydrogels are offered and the potential relevance of self-healing hydrogels to the exciting research areas of 3D/4D printing, soft robotics, and assisted health technologies is highlighted.
Carbon nanotube network formation from evaporating sessile drops
Publisher: American Chemical Society (ACS)
Date: 14-06-2006
DOI: 10.1021/JP062365X
Abstract: Fabrication of single-walled carbon nanotube (SWNT) networks using evaporation of SDS-SWNT sessile drops on a hydrophobized silicon substrate is reported. It is suggested that the organization of nanotubes during evaporation is controlled by aggregates (in the SDS-SWNT dispersion) and hydrophobicity of the substrate. On hydrophobic substrates, the evaporation of SDS-SWNT sessile drops proceeds through constant contact area. On hydrophilic substrates, nanotube aggregates in SDS-SWNT dispersion stop the contact line from moving, resulting in the formation of "coffee-stains". The (partial) removal of aggregates by centrifugation is essential for a freely moving contact line leading to the organization of nanotubes into a network of homogeneously distributed nanotubes on the most hydrophobic substrate. The evaporation of sessile drops was characterized by microscopic, spectroscopic, and topographical techniques.
Fabrication of chemical sensors using inkjet printing and application to gas detection
Publisher: IEEE
Date: 10-2008
Environmental effects on molecular response in materials for non-linear optics
Publisher: Elsevier BV
Date: 03-2000
Association of vitamin D status with arterial blood pressure and hypertension risk: a mendelian randomisation study
Publisher: Elsevier BV
Date: 09-2014
Thermal actuation of hydrogels from PNIPAm, alginate, and carbon nanofibres
Publisher: Wiley
Date: 02-09-2018
DOI: 10.1002/POLB.24430
Sonication-induced effects on carbon nanofibres in composite materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4RA15033C
Abstract: The preparation, characterization and filling of carbon nanofibre–gellan gum composite materials is presented.
Conducting gel-fibres based on carrageenan, chitosan and carbon nanotubes
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0JM00985G
Nanofibrilar-Polyaniline/Carbon Nanotube Composites: Aqueous Dispersions and Films
Publisher: American Scientific Publishers
Date: 10-2009
Abstract: Entirely nanostructured nanofibrilar-polyaniline/multi-walled carbon nanotube (NF-PANI/MWNT) composites with nanotube loadings as high as 50 wt% were synthesized via a facile in-situ chemical polymerization process. These are composed of a nanofibrilar polyaniline (NF-PANI) matrix in which multi-walled carbon nanotubes (MWNTs) are homogeneously embedded and partially covered by polyaniline. Stable and homogeneous aqueous dispersions in concentrations up to 10 mg/ml in water easily were prepared. For the first time, dispersions and casted films of this novel type of NF-PANI/MWNTs composites are characterized. Both, dispersions and films reveal the typical behavior of PANI with slightly changed redox values and with fast reaction kinetics due to the presence of MWNTs. Conductivity of drop cast films reveal values of 20 to 50 S/m. Local SPM measurements confirm the intrinsic fibril structure. In idual fibrils show both semiconducting and metallic behavior with values up to 100 S/m. This new class of nanostructured NF-PANI/MWNT composites with its water-based processing possibilities as well as with its conducting and electrochromic effects will contribute to further progress in the field of smart plastic electronics.
Mechanical Reinforcement of Wool Fiber through Polyelectrolyte Complexation with Chitosan and Gellan Gum
Publisher: MDPI AG
Date: 18-10-2013
DOI: 10.3390/FIB1030047
Hydrogel properties and applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TB90023C
Abstract: Guest editors Jun Fu and Marc in het Panhuis introduce this Journal of Materials Chemistry B themed issue on hydrogel properties and applications.
3D Printable Linear Soft Vacuum Actuators: Their Modeling, Performance Quantification and Application in Soft Robotic Systems
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2019
A simple route to carbon micro- and nanorod hybrid structures by physical vapour deposition
Publisher: IOP Publishing
Date: 13-09-2012
DOI: 10.1088/0022-3727/45/39/395102
Abstract: Tilted well-aligned carbon micro- and nano-hybrid rods were synthesized on Si at different substrate temperatures and incident angles of carbon source beam using the hot filament physical vapour deposition technique. The morphologic surfaces, chemical compositions and bond structures of the oblique carbon rod-like structures were investigated by scanning electron microscopy, field emission scanning electron microscopy, transmission electron diffraction and Raman scattering spectroscopy. The field emission behaviour of the fabricated s les was also measured.
Controlled deposition of polymer carbon nanotube composites through inkjet printing
Publisher: IEEE
Date: 07-2008
Polyelectrolyte Complex Materials Consisting of Antibacterial and Cell-Supporting Layers
Publisher: Wiley
Date: 30-12-2012
Degradation behavior of ionic-covalent entanglement hydrogels
Publisher: Wiley
Date: 22-07-2014
DOI: 10.1002/APP.41216
Optically Active Polymer Carbon Nanotube Composite
Publisher: American Chemical Society (ACS)
Date: 10-11-2005
DOI: 10.1021/JP053025Z
Abstract: A completely soluble optically active polyaniline-multiwalled carbon nanotube composite was investigated by spectroscopic and microscopic techniques. It was found that the polymer's optical activity was retained in the presence of carbon nanotubes. Solutions were found to be easily processable into thin films, which exhibited dendritic structures only in the presence of nanotubes.
Microscopy and Spectroscopy of Interactions between Metallopolymers and Carbon Nanotubes
Publisher: American Chemical Society (ACS)
Date: 18-06-2005
DOI: 10.1021/JP051459O
Abstract: The interaction between redox polymers, based on Ru- or Os-bis(2,2'-bipyridyl)-poly(4-vinylpyridine), and carbon nanotubes was investigated by spectroscopic and microscopic techniques. These metallopolymers were found to be excellent dispersants for nanotubes, as a result of a good wetting interaction between polymer and nanotubes. The results obtained show that well-coated in idual nanotubes can be obtained. In addition, interactions between nanotubes and polymers did not significantly affect the electronic and electrochemical properties of the metallopolymers. On the basis of the electrochemical properties of the polymers this opens the possibility of adding functionality through interaction with nanotubes, either as redox active materials with enhanced mechanical properties or by using these modified nanotubes as nanosized electrochemical sensors.
Nanofiltration membranes prepared from pristine and functionalised multiwall carbon nanotubes/biopolymer composites for water treatment applications
Publisher: Elsevier BV
Date: 07-2020
Extrusion printing of ionic-covalent entanglement hydrogels with high toughness
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TB21159B
Development of molecular markers associated with strawberry quality traits using a subtracted diversity array
Publisher: International Society for Horticultural Science (ISHS)
Date: 08-2014
Biofabrication: an overview of the approaches used for printing of living cells
Publisher: Springer Science and Business Media LLC
Date: 24-03-2013
DOI: 10.1007/S00253-013-4853-6
Abstract: The development of cell printing is vital for establishing biofabrication approaches as clinically relevant tools. Achieving this requires bio-inks which must not only be easily printable, but also allow controllable and reproducible printing of cells. This review outlines the general principles and current progress and compares the advantages and challenges for the most widely used biofabrication techniques for printing cells: extrusion, laser, microvalve, inkjet and tissue fragment printing. It is expected that significant advances in cell printing will result from synergistic combinations of these techniques and lead to optimised resolution, throughput and the overall complexity of printed constructs.
Nonlinear photoluminescence in multiwall carbon nanotubes
Publisher: Elsevier BV
Date: 03-2001
Bio-ink for on-demand printing of living cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2BM00114D
The Suitability of 3-D Printed Eutectic Gallium-Indium Alloy as a Heating Element for Thermally Active Hydrogels
Publisher: Springer Science and Business Media LLC
Date: 15-12-2016
DOI: 10.1557/ADV.2016.618
Degradable 3D-Printed Hydrogels Based on Star-Shaped Copolypeptides
Publisher: American Chemical Society (ACS)
Date: 17-04-2018
DOI: 10.1021/ACS.BIOMAC.8B00299
Abstract: We present a star copolypeptide-based hydrogel ink capable of structural microfabrication using 3D extrusion printing. The material comprises an hiphilic block copolymer structure of poly(benzyl-l-glutamate)- b-oligo(l-valine), which spontaneously forms hydrogels through hydrophobic interactions. The chemical design allows the bulk phase of the hydrogel to remain intact after application of shear due to its self-recovery behavior. It is demonstrated that the composition of the materials is ideally suited for 3D printing with scaffolds capable of maintaining structural cohesion after extrusion. Post extrusion UV-triggered fixation of the printed structures is carried out, resulting in stable hydrogel constructs. The constructs were found to be degradable, exhibited favorable release of encapsulated molecular cargo, and do not appear to affect the metabolic health of the commonly used fibroblastic cell line Balb/3T3 in the absence of the reactive diluent N, N'-methylenebis(acrylamide). The star copolypeptide inks allow for rapid prototyping enabling the fabrication of defined intricate microstructures, providing a platform for complex scaffold development that would otherwise be unattainable with other processing techniques such as molding or casting.
Conducting textiles from single-walled carbon nanotubes
Publisher: Elsevier BV
Date: 05-2007
3D printing of tough hydrogel composites with spatially varying materials properties
Publisher: Elsevier BV
Date: 03-2017
Assessment of commercialized nylon membranes integrated with thin layer of MWCNTs for potential use in desalination process
Publisher: Elsevier BV
Date: 11-2022
Nanofiltration applications of tough MWNT buckypaper membranes containing biopolymers
Publisher: Elsevier BV
Date: 05-2017
Assembling carbon nanotubosomes using an emulsion-inversion technique
Publisher: Royal Society of Chemistry (RSC)
Date: 2005
DOI: 10.1039/B417901C
Abstract: Novel micro-capsules (carbon nanotubosomes) have been fabricated by cross-linking shells of amine-functionalized multi-walled carbon nanotubes (MWNTs) produced by their adsorption on water-in-oil emulsion drops followed by an emulsion-inversion.
Stabilization of single-wall carbon nanotubes in fully sulfonated polyaniline
Publisher: American Scientific Publishers
Date: 11-2004
DOI: 10.1166/JNN.2004.148
Abstract: The interaction of single wall carbon nanotubes (SWNT) with an aqueous solution of the fully sulfonated polyaniline poly(2-methoxyaniline-5-sulfonic acid) (PMAS) and (+)-1-phenylethylamine (PhEA) has been investigated using spectroscopic methods. UV-vis spectral measurements show that the PMAS backbone undergoes conformational changes upon interaction with both SWNT and PhEA. Partial intercalation of PMAS into SWNTbundles was confirmed by Raman spectroscopy and electron microscopy.
Brain on a bench top: Cortical neurons within a 3D printed structure
Publisher: Elsevier BV
Date: 03-2016
Inkjet printed water sensitive transparent films from natural gum–carbon nanotube composites
Publisher: Royal Society of Chemistry (RSC)
Date: 2007
DOI: 10.1039/B704368F
The effect of preparation conditions and biopolymer dispersants on the properties of SWNT buckypapers
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B914824H
Gelapin, a degradable genipin cross-linked gelatin hydrogel
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2RA22859A
Surface analysis of lipids by mass spectrometry: More than just imaging
Publisher: Elsevier BV
Date: 10-2013
DOI: 10.1016/J.PLIPRES.2013.04.005
Abstract: Mass spectrometry is now an indispensable tool for lipid analysis and is arguably the driving force in the renaissance of lipid research. In its various forms, mass spectrometry is uniquely capable of resolving the extensive compositional and structural ersity of lipids in biological systems. Furthermore, it provides the ability to accurately quantify molecular-level changes in lipid populations associated with changes in metabolism and environment bringing lipid science to the "omics" age. The recent explosion of mass spectrometry-based surface analysis techniques is fuelling further expansion of the lipidomics field. This is evidenced by the numerous papers published on the subject of mass spectrometric imaging of lipids in recent years. While imaging mass spectrometry provides new and exciting possibilities, it is but one of the many opportunities direct surface analysis offers the lipid researcher. In this review we describe the current state-of-the-art in the direct surface analysis of lipids with a focus on tissue sections, intact cells and thin-layer chromatography substrates. The suitability of these different approaches towards analysis of the major lipid classes along with their current and potential applications in the field of lipid analysis are evaluated.
Inkjet printing: a viable tool for processing polymer carbon nanotube composites
Publisher: SPIE
Date: 21-12-2007
DOI: 10.1117/12.758999
3D Printing of Transparent and Conductive Heterogeneous Hydrogel–Elastomer Systems
Publisher: Wiley
Date: 11-01-2017
Abstract: A hydrogel-dielectric-elastomer system, polyacrylamide and poly(dimethylsiloxane) (PDMS), is adapted for extrusion printing for integrated device fabrication. A lithium-chloride-containing hydrogel printing ink is developed and printed onto treated PDMS with no visible signs of delamination and geometrically scaling resistance under moderate uniaxial tension and fatigue. A variety of designs are demonstrated, including a resistive strain gauge and an ionic cable.
Synthesis and Properties of Optically Active Polyaniline Carbon Nanotube Composites
Publisher: American Chemical Society (ACS)
Date: 16-09-2006
DOI: 10.1021/MA061587Q
Development of carboxymethyl cellulose-based hydrogel and nanosilver composite as antimicrobial agents for UTI pathogens
Publisher: Elsevier BV
Date: 03-2016
DOI: 10.1016/J.CARBPOL.2015.11.004
Abstract: Silver nanoparticles (AgNPs) containing hydrogel composite were first synthesized by preparing a new hydrogel from carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), and the cross-linker ethylene glycol diglycidyl ether (EGDE), followed by the incorporation of AgNPs by microwave radiation. The resulting neat hydrogels and AgNPs-hydrogel composites were characterized using spectral, thermal, microscopic analysis and X-ray diffraction (XRD) analyses. The SEM and TEM results demonstrated that the synthesized AgNPs were spherical with diameters ranging from 8 to 14nm. In addition, the XRD analysis confirmed the nanocrystalline phase of silver with face-centered cubic (FCC) crystal structure. Energy dispersive spectroscopy (EDS) analysis of the AgNPs confirmed the presence of an elemental silver signal, and no peaks of any other impurities were detected. Additionally, the antibacterial activities of the neat hydrogel and AgNPs-hydrogel composites were measured by Kirby-Bauer method against urinary tract infection (UTI) pathogens. The rheology measurement revealed that the values of storage modulus (G') were higher than that of loss modulus (G″). The AgNPs-hydrogel composites exhibited higher antibacterial activity against Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus vulgaris, Staphylococcus aureus and Proteus mirabilis compared to the corresponding neat hydrogel.
Computational fluid dynamics performance evaluation of grooved fins for surfboards
Publisher: Springer Science and Business Media LLC
Date: 20-07-2022
DOI: 10.1557/S43580-022-00311-5
Abstract: In this paper, we used computational fluid dynamics simulation (ANSYS CFX) to compare the performance of surfboard fins with grooves (and a bumpy-leading edge) to conventional surfboard fins. The simulations predicted the performance of each type of fins in terms of hydrodynamic forces and their behavior for angles of attack up to 45 degrees. Our results indicated that the pressure contours around fins with grooves (and bumpy-leading edge) were lower compared to pressure contours around conventional fins. The grooved fins exhibited a 13 ± 1% reduction in drag (coupled with a much smaller reduction in lift) at the stall angle, contributing to an overall 11 ± 1% improvement in the lift-to-drag ratio compared to conventional fins. Graphical abstract
Inkjet Printing of Transparent, Electrically Conducting Single-Walled Carbon-Nanotube Composites
Publisher: Wiley
Date: 03-09-2007
Ionic-covalent entanglement hydrogels from gellan gum, carrageenan and an epoxy-amine
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3SM27413F
Nonlinear photoluminescence from multiwalled carbon nanotubes
Publisher: SPIE
Date: 07-12-2001
DOI: 10.1117/12.449851
Carbon nanotubes: enhancing the polymer building blocks for intelligent materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B606959B
Reinforced Materials Based on Chitosan, TiO2 and Ag Composites
Publisher: MDPI AG
Date: 16-02-2012
DOI: 10.3390/POLYM4010590
Influence of added hydrogen bonding agents on the chiroptical properties of chiral polyaniline
Publisher: Elsevier BV
Date: 04-2009
25 Years of Reticular Chemistry
Publisher: Wiley
Date: 09-07-2021
Abstract: At its core, reticular chemistry has translated the precision and expertise of organic and inorganic synthesis to the solid state. While initial excitement over metal–organic frameworks (MOFs) and covalent organic frameworks (COFs) was undoubtedly fueled by their unprecedented porosity and surface areas, the most profound scientific innovation of the field has been the elaboration of design strategies for the synthesis of extended crystalline solids through strong directional bonds. In this contribution we highlight the different classes of reticular materials that have been developed, how these frameworks can be functionalized, and how complexity can be introduced into their backbones. Finally, we show how the structural control over these materials is being extended from the molecular scale to their crystal morphology and shape on the nanoscale, all the way to their shaping on the bulk scale.
Electrical conductivity and impedance behaviour of hydrogels
Publisher: SPIE
Date: 27-08-2014
DOI: 10.1117/12.2066370
Synthesis and characterisation of MWNT/chitosan and MWNT/chitosan-crosslinked buckypaper membranes for desalination
Publisher: Elsevier BV
Date: 09-2017
Living electrodes based on green algae in hydrogels
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0MA00985G
Abstract: We report living electrode materials from green algae “ Chlorella vulgaris ” embedded within alginate hydrogel and cross-linked at different calcium chloride concentrations.
Characterization of the Interaction of Gamma Cyclodextrin with Single-Walled Carbon Nanotubes
Publisher: American Chemical Society (ACS)
Date: 19-04-2003
DOI: 10.1021/NL034181P
Nanomanipulation of Individual Carbon Nanotubes
Publisher: Oxford University Press (OUP)
Date: 08-2004
DOI: 10.1017/S1431927604880346
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.
Optimal polymer characteristics for nanotube solubility
Publisher: Elsevier BV
Date: 03-2001
Effect of flexure hinge type on a 3D printed fully compliant prosthetic finger
Publisher: IEEE
Date: 07-2015
Radical Generation from the Gas-Phase Activation of Ionized Lipid Ozonides
Publisher: American Chemical Society (ACS)
Date: 08-05-2017
Robust biopolymer based ionic–covalent entanglement hydrogels with reversible mechanical behaviour
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TB00258J
Abstract: A robust ionic–covalent entanglement hydrogel from gum and gelatin with reversible mechanical characteristics is reported.
Gel–carbon nanotube composites: the effect of carbon nanotubes on gelation and conductivity behaviour
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B818411A
Spinning Carbon Nanotube-Gel Fibers Using Polyelectrolyte Complexation
Publisher: Wiley
Date: 08-12-2008
Extrusion printing conducting gel-carbon nanotube structures upon flexible substrates.
Publisher: IEEE
Date: 12-2010
Characterization of an Interaction between Functionalized Carbon Nanotubes and an Enzyme
Publisher: American Scientific Publishers
Date: 06-2003
DOI: 10.1166/JNN.2003.187
Abstract: Carbon nanotubes (CNTs) did not exhibit strong interactions with Biliverdin IX beta reductase enzyme (BVRB) in water. With the use of noncovalent functionalization by the surfactant Triton X-100, the surfaces of the CNTs were changed from hydrophobic to hydrophilic. The hydrophilic surface of the CNT-Triton conjugate interacts with the hydrophilic surface of BVRB, thus creating a water-soluble complex. Results from ultracentrifugation through a sucrose gradient and gel electrophoresis show the presence of the enzyme. Raman spectroscopy confirmed that the enzyme indeed interacts with CNT-Triton conjugates.
Peptide modification of purified gellan gum
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4TB01727G
Abstract: Gellan gum, an anionic polysaccharide is purified and modified with a short peptide to enhance cell attachment.
Fabrication of Polyaniline-Based Gas Sensors Using Piezoelectric Inkjet and Screen Printing for the Detection of Hydrogen Sulfide
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2010
A 3D-printed instrumented surfboard fin for measuring fin flex
Publisher: Springer Science and Business Media LLC
Date: 15-01-2022
Modified gellan gum hydrogels for tissue engineering applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3SM27389J
Mechanical characteristics of swollen gellan gum hydrogels
Publisher: Wiley
Date: 17-06-2013
DOI: 10.1002/APP.39583
Bioinspired 3D Printable Soft Vacuum Actuators for Locomotion Robots, Grippers and Artificial Muscles.
Publisher: Mary Ann Liebert Inc
Date: 12-2018
Abstract: Continued technological progress in robotic systems has led to more applications where robots and humans operate in close proximity and even physical contact in some cases. Soft robots, which are made of highly compliant and deformable materials, provide inherent safety features unlike conventional robots that are made of stiff and rigid components. Soft robotics is a rapidly developing field exploiting biomimetic design principles, novel sensor and actuation concepts, and advanced manufacturing techniques. In this study, we propose novel 3D printable soft vacuum actuators that are inspired by the sporangium of fern trees. These actuators that are directly manufactured using commercial and affordable fused deposition modeling 3D printers offer many advantages such as high actuation speed (5.54 Hz), long lifetime (123,000 cycles), large payload to weight ratio (∼26), and significant output forces (∼16 N). The behavior of these actuators is accurately predicted, and their performance is optimized using finite element modeling. Furthermore, erse robotic applications such as locomotion robots (a walking robot moving with an average forward speed of
A simulation study of the kinetics of passage of CO2 and N2 through the liquid/vapor interface of water
Publisher: AIP Publishing
Date: 08-1999
DOI: 10.1063/1.479491
Abstract: The rate of passage of molecules of carbon dioxide and nitrogen through the vapor–liquid interface of water at 300 K is studied by simulation. Previous work has established the form of the free energy profile which has a minimum when the solute molecule is on the surface and a barrier between this state and solution in the bulk liquid. In one set of simulations, trajectories were initiated in the gas phase. From these, the average lifetime of molecules in the surface is determined to be considerably longer than the inverse of the energy relaxation rate, so that the sticking coefficient is one and exiting molecules have no memory of their original velocities. However, most molecules do return to the gas phase rather than entering the bulk solution. The rate of passage of molecules over the free energy barrier is studied using the reactive flux method with trajectories initiated near the top of the barrier. The results for nitrogen, in particular, give a good plateau in the time-dependent transmission coefficient and hence a reliable rate constant. The results from these two sets of simulations are combined to give an effective interface width which is used to determine the permeability of thin water films. These results are compared to experimental permeabilities of thin Newton black soap films. The rate-determining step for solution in bulk water is not passage through the few Ångstroms width of the interface we study, but rather the transport from the vicinity of the interface into the bulk over the larger distance scale of μm.
Extrusion Printing of Flexible Electrically Conducting Carbon Nanotube Networks
Publisher: Wiley
Date: 06-07-2012
Electrically conducting PEDOT:PSS - Gellan Gum Hydrogels
Publisher: Springer Science and Business Media LLC
Date: 2013
Abstract: Hydrogels consisting of the conducting polymer PEDOT:PSS and the biopolymer gellan gum (GG) were characterized using electrical, mechanical and rheological methods. Compression testing and rheological analysis showed that the gels weakened with increasing PEDOT:PSS content. In contrast, the increasing PEDOT:PSS content resulted in an increasing electrical conductivity.
Spectroscopic analysis of the intermolecular interactions of gamma cyclodextrin and carbon nanotubes
Publisher: SPIE
Date: 17-03-2003
DOI: 10.1117/12.463667
Imaging of human lens lipids by desorption electrospray ionization mass spectrometry
Publisher: American Chemical Society (ACS)
Date: 12-2010
DOI: 10.1016/J.JASMS.2010.09.003
Abstract: The lipid composition of the human lens is distinct from most other tissues in that it is high in dihydrosphingomyelin and the most abundant glycerophospholipids in the lens are unusual 1-O-alkyl-ether linked phosphatidylethanolamines and phosphatidylserines. In this study, desorption electrospray ionization (DESI) mass spectrometry-imaging was used to determine the distribution of these lipids in the human lens along with other lipids including, ceramides, ceramide-1-phosphates, and lyso 1-O-alkyl ethers. To achieve this, 25 μm lens slices were mounted onto glass slides and analyzed using a linear ion-trap mass spectrometer equipped with a custom-built, 2-D automated DESI source. In contrast to other tissues that have been previously analyzed by DESI, the presence of a strong acid in the spray solvent was required to desorb lipids directly from lens tissue. Distinctive distributions were observed for [M + H](+) ions arising from each lipid class. Of particular interest were ionized 1-O-alkyl phosphatidylethanolamines and phosphatidylserines, PE (18:1e/18:1), and PS (18:1e/18:1), which were found in a thin ring in the outermost region of the lens. This distribution was confirmed by quantitative analysis of lenses that were sectioned into four distinct regions (outer, barrier, inner, and core), extracted and analyzed by electrospray ionization tandem mass spectrometry. DESI-imaging also revealed a complementary distribution for the structurally-related lyso 1-O-alkyl phosphatidylethanolamine, LPE (18:1e), which was localized closer to the centre of the lens. The data obtained in this study indicate that DESI-imaging is a powerful tool for determining the spatial distribution of human lens lipids.
Variants Close to NTRK2 Gene Are Associated With Birth Weight in Female Twins
Publisher: Cambridge University Press (CUP)
Date: 20-06-2014
DOI: 10.1017/THG.2014.34
Abstract: Low weight at birth has previously been shown to be associated with a number of adult diseases such as type 2 diabetes, cardiovascular disease, high blood pressure, and obesity later in life. Genome-wide association studies (GWAS) have been published for singleton-born in iduals, but the role of genetic variation in birth weight (BW) in twins has not yet been fully investigated. A GWAS was performed in 4,593 female study participants with BW data available from the TwinsUK cohort. A genome-wide significant signal was found in chromosome 9, close to the NTRK2 gene (OMIM: 600456). QIMR, an Australian twin cohort ( n = 3,003), and UK-based singleton-birth in iduals from the Hertfordshire cohort ( n = 2,997) were used as replication for the top two single nucleotide polymorphism (SNPs) underpinning this signal, rs12340987 and rs7849941. The top SNP, rs12340987, was found to be in the same direction in the Australian twins and in the singleton-born females (fixed effects meta-analysis beta = -0.13, SE = 0.02, and p = 1.48 × 10 −8 ) but not in the singleton-born males tested. These findings provide an important insight into the genetic component of BW in twins who are normally excluded due to their lower BW when compared with singleton births, as well as the difference in BW between twins. The NTRK2 gene identified in this study has previously been associated with obesity.
Reversible transport characteristics of multi-walled carbon nanotubes in free space
Publisher: IOP Publishing
Date: 06-07-2005
Three-dimensional printing fiber reinforced hydrogel composites
Publisher: American Chemical Society (ACS)
Date: 08-09-2014
DOI: 10.1021/AM503878D
Abstract: An additive manufacturing process that combines digital modeling and 3D printing was used to prepare fiber reinforced hydrogels in a single-step process. The composite materials were fabricated by selectively pattering a combination of alginate/acrylamide gel precursor solution and an epoxy based UV-curable adhesive (Emax 904 Gel-SC) with an extrusion printer. UV irradiation was used to cure the two inks into a single composite material. Spatial control of fiber distribution within the digital models allowed for the fabrication of a series of materials with a spectrum of swelling behavior and mechanical properties with physical characteristics ranging from soft and wet to hard and dry. A comparison with the "rule of mixtures" was used to show that the swollen composite materials adhere to standard composite theory. A prototype meniscus cartilage was prepared to illustrate the potential application in bioengineering.
Design, Modeling, and Control of a 3D Printed Monolithic Soft Robotic Finger With Embedded Pneumatic Sensing Chambers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2021
3D printing Vegemite and Marmite: Redefining “breadboards”
Publisher: Elsevier BV
Date: 03-2018
Biopolymer Based Tough and Self-Recovering Ionic-Covalent Entanglement Hydrogels
Publisher: Springer Science and Business Media LLC
Date: 2014
DOI: 10.1557/OPL.2014.689
Abstract: Emerging applications for hydrogels such as soft robotics and tissue engineering require hydrogels with enhanced mechanical performance. We report the mechanical characteristics of two types of hydrogels: i) ionic-covalent entanglement (ICE) network hydrogels based on calcium cross-linked gellan gum and genipin cross-linked gelatin and ii) ICE microsphere reinforced gelatin hydrogels. This investigation showed that ICE gels can recover up 80% of their mechanical behavior during 5 repeated compressions. In addition, the optimum mechanical performance of gelatin reinforced gels was achieved with inclusion of 40% of ICE microspheres.
Interconnecting Carbon Nanotubes with an Inorganic Metal Complex
Publisher: American Chemical Society (ACS)
Date: 26-10-2002
DOI: 10.1021/JA028119Q
Abstract: Intermolecular carbon nanotube junctions were formed through amide linkage of amino functionalized multiwall carbon nanotubes and [Ru (dcbpy)(bpy)2](PF6)2, an inorganic metal complex. Nanotube interconnects were visualized using atomic force microscopy. Absorption and emission spectroscopy showed significant changes between starting products and the resulting ruthenium nanotube complex, indicative of successful chemical modification.
Fabrication of porous PDMS sponges using spontaneously self-removing sacrificial templates
Publisher: Springer Science and Business Media LLC
Date: 22-01-2022
Gellan gum doped polypyrrole neural prosthetic electrode coatings
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1SM05063J
Tissue engineering with gellan gum
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6BM00322B
Abstract: A review of current research into the emerging polysaccharide gellan gum, highlighting its potential in tissue engineering.
Mechanical stiffness augmentation of a 3D printed soft prosthetic finger
Publisher: IEEE
Date: 07-2016
Using ambient ozone for assignment of double bond position in unsaturated lipids
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1AN15864C
Abstract: Unsaturated lipids deposited onto a range of materials are observed to react with the low concentrations of ozone present in normal laboratory air. Parent lipids and ozonolysis cleavage products are both detected directly from surfaces by desorption electrospray ionisation mass spectrometry (DESI-MS) with the resulting mass spectra providing clear evidence of the double bond position within these molecules. This serendipitous process has been coupled with thin-layer chromatography (TLC) to provide a simple but powerful approach for the detailed structural elucidation of lipids present in complex biological extracts. Lipid extracts from human lens were deposited onto normal phase TLC plates and then developed to separate components according to lipid class. Exposure of the developed plates to laboratory air for ca. 1 h prior to DESI-MS analysis gave rise to ozonolysis products allowing for the unambiguous identification of double bond positions in even low abundant, unsaturated lipids. In particular, the co-localization of intact unsaturated lactosylceramides (LacCer) with products from their oxidative cleavage provide the first evidence for the presence of three isomeric LacCer (d18:0/24:1) species in the ocular lens lipidome, i.e., variants with double bonds at the n-9, n-7 and n-5 positions.
Nanotube Network Transistors from Peptide‐Wrapped Single‐Walled Carbon Nanotubes
Publisher: Wiley
Date: 20-07-2005
Programmable enzymatic oxidation of tyrosine–lysine tetrapeptides
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TB00250J
Abstract: Fmoc-capped tetrapeptides bearing two lysines and two tyrosines show programmable enzymatic activity. Solvent accessible tyrosines determine the extent of reactivity with tyrosinase, and subsequent quinone formation drives polymerisation.
A 3D-Printed Omni-Purpose Soft Gripper
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2019
Effect of heterocyclic capping groups on the self-assembly of a dipeptide hydrogel
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6SM00025H
Abstract: In this work it is shown that the selection of heterocyclic capping group for a dipeptide hydrogel affects the self-assembly pathway taken, resulting in differences in mechanical strength, network structure and thixotropic properties.
Preparation and characterisation of graphene composite hydrogels
Publisher: Elsevier BV
Date: 03-2013
Microscopic treatment of substrate effects on linear and quadratic optical response of model Langmuir–Blodgett multilayers
Publisher: AIP Publishing
Date: 15-12-2000
DOI: 10.1063/1.1323725
Abstract: Microscopic calculations are reported of linear and quadratic nonlinear optical response in model Langmuir–Blodgett films on a substrate, which is treated by the method of images. The effect of the substrate is significant in the first two layers, and is greatest for tilted molecules with their head groups adjacent to the substrate. The main qualitative effect is to lower the symmetry relative to a free-standing film. Calculations for stearic acid films show that the substrate effect is most important for molecules with nonuniform response on a metallic substrate.
Distributed polarizability analysis for para-nitroaniline and meta-nitroaniline: Functional group and charge-transfer contributions
Publisher: AIP Publishing
Date: 08-06-2004
DOI: 10.1063/1.1752879
Abstract: Topological partitioning of electronic properties is used to investigate the polarizability of para-nitroaniline and meta-nitroaniline. The distributed polarizabilities for atoms are combined into total local or generalized distributed contributions for the amino, ring, and nitro functional groups generalized distributed group contributions have not been calculated before. The local group contributions are transferable between the two molecules only when charge transfer is suppressed, but the generalized distributed contributions prove surprisingly similar in the two molecules, apparently because they treat charge-transfer contributions explicitly.
Analysis of linear and quadratic optical response of mixed Langmuir–Blodgett films of stearic acid and 5-CT
Publisher: AIP Publishing
Date: 15-12-2000
DOI: 10.1063/1.1323724
Abstract: Published experimental optical second-harmonic generation (SHG) results for mixed films formed between stearic acid and the mesogen 5-CT (4″-n-pentyl-4-cyano-p-terphenyl) are reanalyzed. Experimental refractive index results for the pure films are used to deduce molecular polarizabilities in order to calculate local fields. At low and high fractions of 5-CT, a consistent interpretation of the SHG is obtained using a mean molecular response based on a fixed axial hyperpolarizability βLLL for the mesogen, but at high mesogen fractions molecular tilt makes small off-diagonal components βLLM≈−βLLL/40 essential. At intermediate fractions the treatment can interpret the SHG only by requiring molecular tilt not found in the experiments, implying that a more detailed structural model is required.
Gellan Gum Hydrogels Filled Edible Oil Microemulsion for Biomedical Materials: Phase Diagram, Mechanical Behavior, and In Vivo Studies
Publisher: MDPI AG
Date: 26-09-2021
Abstract: The demand for wound care products, especially advanced and active wound care products is huge. In this study, gellan gum (GG) and virgin coconut oil (VCO) were utilized to develop microemulsion-based hydrogel for wound dressing materials. A ternary phase diagram was constructed to obtain an optimized ratio of VCO, water, and surfactant to produce VCO microemulsion. The VCO microemulsion was incorporated into gellan gum (GG) hydrogel (GVCO) and their chemical interaction, mechanical performance, physical properties, and thermal behavior were examined. The stress-at-break (σ) and Young’s modulus (YM) of GVCO hydrogel films were increased along with thermal behavior with the inclusion of VCO microemulsion. The swelling degree of GVCO hydrogel decreased as the VCO microemulsion increased and the water vapor transmission rate of GVCO hydrogels was comparable to commercial dressing in the range of 332–391 g m−2 d−1. The qualitative antibacterial activities do not show any inhibition against Gram-negative (Escherichia coli and Klebsiella pneumoniae) and Gram-positive (Staphylococcus aureus and Bacillus subtilis) bacteria. In vivo studies on Sprague–Dawley rats show the wound contraction of GVCO hydrogel is best (95 ± 2%) after the 14th day compared to a commercial dressing of Smith and Nephew Opsite post-op waterproof dressing, and this result is supported by the ultrasound images of wound skin and histological evaluation of the wound. The findings suggest that GVCO hydrogel has the potential to be developed as a biomedical material.
Enhanced gelation properties of purified gellan gum
Publisher: Elsevier BV
Date: 03-2014
DOI: 10.1016/J.CARRES.2014.02.018
Abstract: Gellan gum is a hydrogel-forming polysaccharide when combined with monovalent or alent cations such as sodium, magnesium, potassium or calcium. Commercially, gellan gums are sold with trace amounts of these cations, which have been proven to affect the gelation and mechanical properties of the resultant hydrogels. A new method based on impedance analysis for determining the gel transition temperature of purified and un-purified gellan gum is presented. The sodium salt form of gellan gum is shown to have lower dissolution and gel transition temperatures.
Self-healing hydrogel electrodes from ingestible materials
Publisher: Springer Science and Business Media LLC
Date: 03-03-2021
Filling of carbon nanotubes and nanofibres
Publisher: Beilstein Institut
Date: 19-02-2015
DOI: 10.3762/BJNANO.6.53
Abstract: The reliable production of carbon nanotubes and nanofibres is a relatively new development, and due to their unique structure, there has been much interest in filling their hollow interiors. In this review, we provide an overview of the most common approaches for filling these carbon nanostructures. We highlight that filled carbon nanostructures are an emerging material for biomedical applications.
Modern Surfboards and Their Structural Characterization: Towards an Engineering Approach
Publisher: MDPI
Date: 15-06-2020
Electrical conductivity, impedance, and percolation behavior of carbon nanofiber and carbon nanotube containing gellan gum hydrogels
Publisher: Wiley
Date: 29-04-2014
DOI: 10.1002/POLB.23497
Inkjet printed conducting gel-carbon nanotube materials
Publisher: IEEE
Date: 12-2010
Printed ionic-covalent entanglement hydrogels from carrageenan and an epoxy amine
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA07109C
Abstract: Ionic-covalent entanglement hydrogels were fabricated by 3D-printing.
Synthesis, properties, water and solute permeability of MWNT buckypapers
Publisher: Elsevier BV
Date: 04-2014
Distributed polarizability of the water dimer: Field-induced charge transfer along the hydrogen bond
Publisher: AIP Publishing
Date: 08-05-2001
DOI: 10.1063/1.1361247
Abstract: The topological partitioning of electronic properties approach at Hartree–Fock level is used to investigate charge transfer response in a water dimer. Distributed polarizability components are employed to calculate the change in electron density under external fields. Field-induced charge flow between the water monomers is most significant along the direction of the hydrogen bond. The molecular polarizability of the molecules in the dimer is reduced owing to formation of the hydrogen bond.
Highly conducting composite hydrogels from gellan gum, PEDOT:PSS and carbon nanofibres
Publisher: Elsevier BV
Date: 08-2015
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