263 results found
Anthony DB, Sui XM, Kellersztein I, et al., 2018, Continuous carbon nanotube synthesis on charged carbon fibers, Composites Part A: Applied Science and Manufacturing, Vol: 112, Pages: 525-538, ISSN: 1359-835X
© 2018 The Authors Carbon nanotube grafted carbon fibers (CNT-g-CFs) were prepared continuously, spool to spool, via thermal CVD. The application of an in-situ potential difference (300 V), between the fibers and a cylindrical graphite foil counter electrode, enhanced the growth, producing a uniform coverage of carbon nanotubes with diameter ca. 10 nm and length ca. 125 nm. Single fiber tensile tests show that this approach avoids the significant reduction of the underlying carbon fiber strengths, which is usually associated with CVD grafting processes. Single fiber fragmentation tests in epoxy, with in-situ video fragment detection, demonstrated that the CNT-g-CFs have the highest interfacial shear strength reported for such systems (101 ± 5 MPa), comparable to state-of-the-art sizing controls (103 ± 8 MPa). Single fiber pull-out data show similar trends. The short length of the grafted CNTs is particularly attractive for retaining the volume fraction of the primary fibers in composite applications. The results are compared with a short review of the interfacial data available for related systems.
Au H, Rubio N, Shaffer MSP, 2018, Brominated graphene as a versatile precursor for multifunctional grafting, CHEMICAL SCIENCE, Vol: 9, Pages: 209-217, ISSN: 2041-6520
Brandley E, Greenhalgh ES, Shaffer MSP, et al., 2018, Mapping carbon nanotube orientation by fast fourier transform of scanning electron micrographs, Carbon, Vol: 137, Pages: 78-87, ISSN: 0008-6223
© 2018 The Authors A novel method of applying a two-dimensional Fourier transform (2D-FFT) to SEM was developed to map the CNT orientation in pre-formed arrays. Local 2D-FFTs were integrated azimuthally to determine an orientation distribution function and the associated Herman parameter. This approach provides data rapidly and over a wide range of lengthscales. Although likely to be applicable to a wide range of anisotropic nanoscale structures, the method was specifically developed to study CNT veils, a system in which orientation critically controls mechanical properties. Using this system as a model, key parameters for the 2D-FFT analysis were optimised, including magnification and domain size; a model set of CNT veils were pre-strained to 5%, 10% and 15%, to vary the alignment degree. The algorithm confirmed a narrower orientation distribution function and increasing Herman parameter, with increasing pre-strain. To validate the algorithm, the local orientation was compared to that derived from a common polarised Raman spectroscopy. Orientation maps of the Herman parameter, derived by both methods, showed good agreement. Quantitatively, the mean Herman parameter calculated using the polarised Raman spectroscopy was 0.42 ± 0.004 compared to 0.32 ± 0.002 for the 2D-FFT method, with a correlation coefficient of 0.73. Possible reasons for the modest and systematic discrepancy were discussed.
De Luca F, Clancy AJ, Carrero NR, et al., 2018, Increasing carbon fiber composite strength with a nanostructured "brick-and-mortar" interphase, MATERIALS HORIZONS, Vol: 5, Pages: 668-674, ISSN: 2051-6347
De Luca F, Sernicola G, Shaffer MSP, et al., 2018, "Brick-and-Mortar" Nanostructured Interphase for Glass-Fiber-Reinforced Polymer Composites, ACS APPLIED MATERIALS & INTERFACES, Vol: 10, Pages: 7352-7361, ISSN: 1944-8244
Ellis T, Chiappi M, Garcia-Trenco A, et al., 2018, Multimetallic Microparticles Increase the Potency of Rifampicin against Intracellular Mycobacterium tuberculosis, ACS NANO, Vol: 12, Pages: 5228-5240, ISSN: 1936-0851
Finley JM, Yu H, Longana ML, et al., 2018, Exploring the pseudo-ductility of aligned hybrid discontinuous composites using controlled fibre-type arrangements, COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, Vol: 107, Pages: 592-606, ISSN: 1359-835X
Fisher SJ, Shaffer MSP, 2018, Rapid quantitative mapping of multi-walled carbon nanotube concentration in nanocomposites, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 160, Pages: 161-168, ISSN: 0266-3538
Garcia-Trenco A, Regoutz A, White ER, et al., 2018, PdIn intermetallic nanoparticles for the Hydrogenation of CO2 to Methanol, APPLIED CATALYSIS B-ENVIRONMENTAL, Vol: 220, Pages: 9-18, ISSN: 0926-3373
Hart M, Chen J, Michaelides A, et al., 2018, One-dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single-wall Carbon Nanotubes., Angew Chem Int Ed Engl
The pnictogen nanomaterials, including phosphorene and arsenene, display remarkable electronic and chemical properties. Yet, the structural diversity that these main group elements are capable of is still poorly explored. Here we fill single-wall carbon nanotubes with elemental arsenic from the vapor phase. Using electron microscopy, we find chains of highly reactive As₄ molecules as well as two new one-dimensional allotropes of arsenic: a single-stranded zig-zag chain and a double-stranded zig-zag ladder. These linear structures are important intermediates between the gas-phase clusters of arsenic and the extended sheets of arsenene. Raman spectroscopy indicates weak electronic interaction between the arsenic and the nanotubes which implies that the formation of the new allotropes is driven primarily by the geometry of the confinement. The relative stabilities of the new arsenic structures are estimated computationally. Band-gap calculations predict that the insulating As₄ chains become semiconducting, once converted to the zig-zag ladder, and form the first fully metallic allotrope of arsenic as the zig-zag chain.
Javaid A, Ho KKC, Bismarck A, et al., 2018, Improving the multifunctional behaviour of structural supercapacitors by incorporating chemically activated carbon fibres and mesoporous silica particles as reinforcement, Journal of Composite Materials, ISSN: 0021-9983
© 2018, The Author(s) 2018. Novel structural supercapacitors have been fabricated which can simultaneously carry mechanical loads as well as store electrochemical energy. Structural supercapacitors are fabricated by impregnating activated carbon fibre mat electrodes and glass fibre mat separator with crosslinked polymer electrolytes using the resin infusion under flexible tooling method. Mesoporous silica particles are also used as reinforcements to further improve the electrochemical and mechanical performance of structural supercapacitors. The fabricated structural supercapacitors have been characterised through chronoamperometry method and impedance spectroscopy to evaluate the electrochemical performance and in-plane shear properties to evaluate the mechanical performance. A multifunctional structural supercapacitor, exhibiting simultaneously a power density of 34 W kg−1, an energy density of 0.12 Wh kg−1and a shear modulus of 1.75 GPa, has been fabricated.
Kennedy OW, Coke ML, White ER, et al., 2018, MBE growth and morphology control of ZnO nanobelts with polar axis perpendicular to growth direction, MATERIALS LETTERS, Vol: 212, Pages: 51-53, ISSN: 0167-577X
Leung AHM, Pike SD, Clancy AJ, et al., 2018, Layered zinc hydroxide monolayers by hydrolysis of organozincs, CHEMICAL SCIENCE, Vol: 9, Pages: 2135-2146, ISSN: 2041-6520
Robinson RK, Birrell MA, Adcock JJ, et al., 2018, Mechanistic link between diesel exhaust particles and respiratory reflexes, JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY, Vol: 141, Pages: 1074-+, ISSN: 0091-6749
Thong AZ, Shaffer MSP, Horsfield AP, 2018, Rectification and negative differential resistance via orbital level pinning, SCIENTIFIC REPORTS, Vol: 8, ISSN: 2045-2322
Woodward RT, Markoulidis F, De Luca F, et al., 2018, Carbon foams from emulsion-templated reduced graphene oxide polymer composites: electrodes for supercapacitor devices, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 6, Pages: 1840-1849, ISSN: 2050-7488
Zhu Y, Radlauer MR, Schneiderman DK, et al., 2018, Multiblock Polyesters Demonstrating High Elasticity and Shape Memory Effects, MACROMOLECULES, Vol: 51, Pages: 2466-2475, ISSN: 0024-9297
Anthony DB, Qian H, Clancy AJ, et al., 2017, Applying a potential difference to minimise damage to carbon fibres during carbon nanotube grafting by chemical vapour deposition, NANOTECHNOLOGY, Vol: 28, ISSN: 0957-4484
Buckley DJ, Hodge SA, De Marco M, et al., 2017, Trajectory of the Selective Dissolution of Charged Single-Walled Carbon Nanotubes, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 121, Pages: 21703-21712, ISSN: 1932-7447
Clancy AJ, Anthony DB, Fisher SJ, et al., 2017, Reductive dissolution of supergrowth carbon nanotubes for tougher nanocomposites by reactive coagulation spinning, NANOSCALE, Vol: 9, Pages: 8764-8773, ISSN: 2040-3364
Clancy AJ, Serginson JM, Greenfield JL, et al., 2017, Systematic comparison of single-walled carbon nanotube/poly(vinyl acetate) graft-to reactions, POLYMER, Vol: 133, Pages: 263-271, ISSN: 0032-3861
De Marco M, Menzel R, Bawaked SM, et al., 2017, Hybrid effects in graphene oxide/carbon nanotube-supported layered double hydroxides: enhancing the CO2 sorption properties, CARBON, Vol: 123, Pages: 616-627, ISSN: 0008-6223
Garcia-Trenco A, White ER, Regoutz A, et al., 2017, Pd2Ga-Based Colloids as Highly Active Catalysts for the Hydrogenation of CO2 to Methanol, ACS CATALYSIS, Vol: 7, Pages: 1186-1196, ISSN: 2155-5435
Gonzalez Carter DA, Leo BF, Ruenraroengsak P, et al., 2017, Silver nanoparticles reduce brain inflammation and related neurotoxicity through induction of H2S-synthesizing enzymes, Scientific Reports, Vol: 7, ISSN: 2045-2322
Silver nanoparticles (AgNP) are known to penetrate into the brain and cause neuronal death. However, there is a paucity in studies examining the effect of AgNP on the resident immune cells of the brain, microglia. Given microglia are implicated in neurodegenerative disorders such as Parkinson’s disease (PD), it is important to examine how AgNPs affect microglial inflammation to fully assess AgNP neurotoxicity. In addition, understanding AgNP processing by microglia will allow better prediction of their long term bioreactivity. In the present study, the in vitro uptake and intracellular transformation of citrate-capped AgNPs by microglia, as well as their effects on microglial inflammation and related neurotoxicity were examined. Analytical microscopy demonstrated internalization and dissolution of AgNPs within microglia and formation of non-reactive silver sulphide (Ag2S) on the surface of AgNPs. Furthermore, AgNP-treatment up-regulated microglial expression of the hydrogen sulphide (H2S)-synthesizing enzyme cystathionine-γ-lyase (CSE). In addition, AgNPs showed significant anti-inflammatory effects, reducing lipopolysaccharide (LPS)-stimulated ROS, nitric oxide and TNFα production, which translated into reduced microglial toxicity towards dopaminergic neurons. Hence, the present results indicate that intracellular Ag2S formation, resulting from CSE-mediated H2S production in microglia, sequesters Ag+ ions released from AgNPs, significantly limiting their toxicity, concomitantly reducing microglial inflammation and related neurotoxicity.
Hart M, White ER, Chen J, et al., 2017, Encapsulation and Polymerization of White Phosphorus Inside Single-Wall Carbon Nanotubes, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 56, Pages: 8144-8148, ISSN: 1433-7851
Hu S, Laker ZPL, Leese HS, et al., 2017, Thermochemical functionalisation of graphenes with minimal framework damage, CHEMICAL SCIENCE, Vol: 8, Pages: 6149-6154, ISSN: 2041-6520
Leung AHM, Pike S, Clancy A, et al., 2017, Organometallic route to layered zinc hydroxides and their exfoliated monolayers in apolar solvents, 253rd National Meeting of the American-Chemical-Society (ACS) on Advanced Materials, Technologies, Systems, and Processes, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Miller TS, Suter TM, Telford AM, et al., 2017, Single Crystal, Luminescent Carbon Nitride Nanosheets Formed by Spontaneous Dissolution, NANO LETTERS, Vol: 17, Pages: 5891-5896, ISSN: 1530-6984
Pike SD, Garcia-Trenco A, White ER, et al., 2017, Colloidal Cu/ZnO catalysts for the hydrogenation of carbon dioxide to methanol: investigating catalyst preparation and ligand effectst, CATALYSIS SCIENCE & TECHNOLOGY, Vol: 7, Pages: 3842-3850, ISSN: 2044-4753
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