254 results found
Kennedy OW, White ER, Howkins A, et al., 2019, Mapping the Origins of Luminescence in ZnO Nanowires by STEM-CL., J Phys Chem Lett, Vol: 10, Pages: 386-392
In semiconductor nanowires, understanding both the sources of luminescence (excitonic recombination, defects, etc.) and the distribution of luminescent centers (be they uniformly distributed, or concentrated at structural defects or at the surface) is important for synthesis and applications. We develop scanning transmission electron microscopy-cathodoluminescence (STEM-CL) measurements, allowing the structure and cathodoluminescence (CL) of single ZnO nanowires to be mapped at high resolution. Using a CL pixel resolution of 10 nm, variations of the CL spectra within such nanowires in the direction perpendicular to the nanowire growth axis are identified for the first time. By comparing the local CL spectra with the bulk photoluminescence spectra, the CL spectral features are assigned to internal and surface defect structures. Hyperspectral CL maps are deconvolved to enable characteristic spectral features to be spatially correlated with structural features within single nanowires. We have used these maps to show that the spatial distribution of these defects correlates well with regions that show an increased rate of nonradiative transitions.
Clancy A, Sirisinudomkit P, Anthony D, et al., Real-time Mechanistic Study of Carbon Nanotube Anion Functionalisation through Open Circuit Voltammetry, Chemical Science, ISSN: 2041-6520
The mechanism of the functionalisation of reduced single walled carbon nanotubes with organobromides was monitored byopen circuit voltammetry throughout the reaction and further elucidated through a series of comparative reactions. Thedegree of functionalisation was mapped against the reagent reduction potential, degree of electron donation of substituents(Hammett parameter), and energies calculated, ab initio, for dissociation and heterolytic cleavage of the C-Br bond. Incontrast to the previously assumed reduction/homolytic cleavage mechanism, the reaction was shown to consist of a rapidassociation of carbon-halide bond to the reduced nanotube as a complex, displacing surface-condensed countercations,leading to an initial increase in the net nanotube surface negative charge. The complex subsequently slowly degradesthrough charge transfer from the reduced single-walled carbon nanotube to the organobromide, utilizing charge, and thecarbon-halide bond breaks heterolytically. Electron density on the C-Br bond in the initial reagent is the best predictor fordegree of functionalisation, with more electron donating substituents increasing the degree of functionalisation. Both themechanism and the new application of OCV to study such reactions are potentially relevant to wide range of related systems.
Lee W, Clancy A, Fernández-Toribio JC, et al., Interfacially-grafted single wall carbon nanotube / poly (vinyl alcohol) composite fibers, Carbon, ISSN: 0008-6223
Nanocomposites are critically influenced by interfacial interactions between the reinforcement and matrix. Polyvinyl alcohol (PVOH) of varying molecular weights were prepared and grafted to single-walled carbon nanotubes (SWCNTs), to improve the interfacial interaction with a homopolymer PVOH matrix. Nanocomposite fibers were coagulation spun across a broad range of loading fractions, controlled by the spinning dope composition. An intermediate grafted-PVOH molecular weight (10 kDa) maximized grafting ratio, and the final composite mechanical performance; the positive effects were attributed to the increased degree of dispersion of the SWCNTs in the dope, as well as the favorable interface. The PVOH grafting increased the stability of the SWCNT loading fractions (up to 45 wt.%), offering increased strength (up to 1100 MPa) and stiffness (up to 38.5 GPa); at the same time, strain to-failures remained high (up to 23.3%), resulting in high toughness (up to 125 J g-1).
Clancy AJ, Leese HS, Rubio N, et al., 2018, Depleting Depletion: Maintaining Single-Walled Carbon Nanotube Dispersions after Graft-To Polymer Functionalization, LANGMUIR, Vol: 34, Pages: 15396-15402, ISSN: 0743-7463
Zainol Abidin MS, Herceg T, Greenhalgh ES, et al., 2018, Enhanced fracture toughness of hierarchical carbon nanotube reinforced carbon fibre epoxy composites with engineered matrix microstructure, Composites Science and Technology, ISSN: 0266-3538
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
Basma NS, Headen TF, Shaffer MSP, et al., 2018, Local Structure and Polar Order in Liquid N-Methyl-2-pyrrolidone (NMP), JOURNAL OF PHYSICAL CHEMISTRY B, Vol: 122, Pages: 8963-8971, ISSN: 1520-6106
Jia J, White ER, Clancy AJ, et al., 2018, Fast Exfoliation and Functionalisation of Two-Dimensional Crystalline Carbon Nitride by Framework Charging, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 57, Pages: 12656-12660, ISSN: 1433-7851
Hart M, Chen J, Michaelides A, et al., 2018, One-Dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single-Wall Carbon Nanotubes, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 57, Pages: 11649-11653, ISSN: 1433-7851
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, Vol: 52, Pages: 3085-3097, ISSN: 0021-9983
Anthony DB, Sui X, 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
Clancy AJ, Bayazit MK, Hodge SA, et al., 2018, Charged Carbon Nanomaterials: Redox Chemistries of Fullerenes, Carbon Nanotubes, and Graphenes, CHEMICAL REVIEWS, Vol: 118, Pages: 7363-7408, ISSN: 0009-2665
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
Thong AZ, Shaffer MSP, Horsfield AP, 2018, Rectification and negative differential resistance via orbital level pinning, SCIENTIFIC REPORTS, Vol: 8, ISSN: 2045-2322
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
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
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
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
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
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
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
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
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
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
, 2018, The influence of variability and defects on the structural performance of discontinuous composites, Pages: 2419-2425
© 2018 by DEStech Publications, Inc. All rights reserved. Composite materials often feature defects, particularly for composites which feature a complex microstructure, such as aligned discontinuous composites. This study uses an accurate but efficient virtual testing framework, which was used to predict the influence of defects on the structural performance of both hybrid and nonhybrid aligned discontinuous composites. Fibre vacancy defects were found to cause the strongest reduction in material properties, while hybridisation was found to be an effective means to reduce the influence of defects on the structural response.
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
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
Rocha VG, Garcia-Tunon E, Botas C, et al., 2017, Multimaterial 3D Printing of Graphene-Based Electrodes for Electrochemical Energy Storage Using Thermoresponsive Inks, ACS APPLIED MATERIALS & INTERFACES, Vol: 9, Pages: 37136-37145, ISSN: 1944-8244
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
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
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