21 results found
Anthony DB, Sui X, Kellersztein I, et al., 2018, Continuous carbon nanotube synthesis on charged carbon fibers, Composites Part A: Applied Science and Manufacturing, ISSN: 1359-835X
De Luca F, Clancy A, Rubio Carrero N, et al., 2018, Increasing carbon fiber composite strength with a nanostructured“brick-and-mortar” interphase, Materials Horizons, Vol: 5, Pages: 668-674, ISSN: 2051-6355
Conventional fiber-reinforced composites suffer from the formation of critical clusters of correlated fiber breaks, leading to sudden composite failure in tension. To mitigate this problem, an optimized “brick-and-mortar” nanostructured interphase was developed, in order to absorb energy at fiber breaks and alleviate local stress concentrations whilst maintaining effective load transfer. The coating was designed to exploit crack bifurcation and platelet interlocking mechanisms known in natural nacre. However, the architecture was scaled down by an order of magnitude to allow a highly ordered conformal coating to be deposited around conventional structural carbon fibers, whilst retaining the characteristic phase proportions and aspect ratios of the natural system. Drawing on this bioinspiration, a Layer-by-Layer assembly method was used to coat multiple fibers simultaneously, providing an efficient and potentially scalable route for production. Single fiber pull out and fragmentation tests showed improved interfacial characteristics for energy absorption and plasticity. Impregnated fiber tow model composites demonstrated increases in absolute tensile strength (+15%) and strain-to-failure (+30%), as compared to composites containing conventionally sized fibers.
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
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
Woodward RT, Jobbe-Duval A, Marchesini S, et al., 2017, Hypercrosslinked polyHIPEs as precursors to designable, hierarchically porous carbon foams, POLYMER, Vol: 115, Pages: 146-153, ISSN: 0032-3861
Anthony DB, Grail G, Bismarck A, et al., 2016, Exploring the tensile response in small carbon fibre composite bundles
© 2016, European Conference on Composite Materials, ECCM. All rights reserved.Small composite bundles, AS4 carbon fibre epoxy, with a restricted number of reinforcing fibres, ca. 20, showed a progressive failure when tested in tension. In-situ acoustic emission observations under tensile load reveal that numerous fibres fail before ultimate failure of the small composite bundle, suggesting that isolated and individual fibre failures occur without compromising the integrity of the neighboring fibres or the small composite bundle's overall mechanical performance. The average strength of the carbon fibres in small composite bundles was 9.6% higher than in standard lab-scale composite specimens using the same fibre type.
Anthony DB, Shaffer MSP, 2016, Process for producing carbon-nanotube grafted substrate, WO 2016009207 A1
The present invention relates to a process for producing a carbon nanotube-grafted substrate, the process comprising: providing a substrate having catalytic material deposited thereon; and synthesising carbon nanotubes on the substrate by a chemical vapour deposition process in a reaction chamber; characterised in that the process comprises providing a counter electrode, applying a potential difference to the substrate in relation to the counter electrode and maintaining the potential difference of the substrate in relation to the counter electrode during the chemical vapour deposition process.
Bismarck A, Blaker JJ, Anthony DB, et al., 2016, Development of novel composites through fibre and interface/interphase modification, 37th Riso International Symposium on Materials Science - Understanding Performance of Composite Materials - Mechanisms Controlling Properties, Publisher: IOP PUBLISHING LTD, ISSN: 1757-8981
Blaker JJ, Anthony DB, Tang G, et al., 2016, Property and Shape Modulation of Carbon Fibers Using Lasers, ACS APPLIED MATERIALS & INTERFACES, Vol: 8, Pages: 16351-16358, ISSN: 1944-8244
De Luca H, Anthony DB, Qian H, et al., 2016, Non-damaging and scalable carbon nanotube synthesis on carbon fibres
© 2016, European Conference on Composite Materials, ECCM. All rights reserved.The growth of carbon nanotubes (CNTs) on carbon fibres (CFs) to produce a hierarchical fibre with two differing reinforcement length scales, in this instance nanometre and micrometre respectively, is considered a route to improve current state-of-the-art fibre reinforced composites . The scalable production of carbon nanotube-grafted-carbon fibres (CNT-g-CFs) has been limited due to high temperatures, the use of flammable gases and the requirement of inert conditions for CNT synthesis, whist (ideally) maintaining underlying original substrate mechanical properties. Here, the continuous production of CNT-g-CF is demonstrated in an open chemical vapour deposition (CVD) reactor, crucially, whilst retaining the tensile properties of the carbon fibres. As synthesised CNTs have a diameter of sub 20 nm and length ca. 120 nm, which are predicted to provide ideal fibre reinforcement in composites by retaining optimal composite fibre volume fraction (60%), whilst improving interfacial bonding of the matrix and reinforcement [1, 2]. Mild processing techniques enable this modified CVD process to be fully compatible with industrial practices, and have the potential to generate large volumes of hierarchical CNT-g-CF material.
Woodward RT, Fam DWH, Anthony DB, et al., 2016, Hierarchically porous carbon foams from pickering high internal phase emulsions, CARBON, Vol: 101, Pages: 253-260, ISSN: 0008-6223
Menzel R, Barg S, Miranda M, et al., 2015, Joule Heating Characteristics of Emulsion-Templated Graphene Aerogels, ADVANCED FUNCTIONAL MATERIALS, Vol: 25, Pages: 28-35, ISSN: 1616-301X
Qian H, Nguyen S, Anthony DB, et al., 2015, Stiff monolithic aerogel matrices for structural fibre composites, 20th International Conference on Composite Materials, Publisher: iccm-central.org
Resorcinol-formaldehyde based aerogel precursors were infused into structural carbon fibreweaves, then gelled and carbonised to generate a continuous monolithic matrix network. Thishierarchical carbon preform was subsequently infused with polymeric resins, both multifunctional andstructural, to produce dense composites. The resulting hierarchical composites have a nanoscalereinforcement in the matrix at up to an order of magnitude higher loadings than typically available byother techniques. Compression, tension, ±45° shear and short beam tests demonstrate the potential ofsuch matrix systems to address matrix dominated failures. However, for the best structuralperformance it will be necessary to re-optimise the fibre-matrix interface, which is degraded by thecurrent processing regime.
Hodge SA, Tay HH, Anthony DB, et al., 2014, Probing the charging mechanisms of carbon nanomaterial polyelectrolytes, FARADAY DISCUSSIONS, Vol: 172, Pages: 311-325, ISSN: 1359-6640
Anthony DB, Bacarreza Nogales O, Shaffer M, et al., Pseudo-ductile failure mechanism introduced into finger jointed thermoplastic PES interleaved CFRC, ECCM18 - 18th European Conference on Composite Materials
Pre-cut unidirectional carbon fibre prepreg composites, with an overlapped finger-joint architecture, were modified through the addition of polyethersulfone (PES) interleaves. The properties arising from these finger-jointed configurations were strongly dependent on the interply overlap region. When the tough thermoplastic interleaves spanned only the central portion of the overlap, a crack arresting failure mechanism was observed in tension. A pronounced plateau region or pseudo-ductile response was shown in conjunction with a strain hardening response after crack arrest. The local strain-to-failure of PES interleaved samples was ~3.2%, an increase of 85% compared to the pre-cut baseline (strain-to-failure 1.6%, pre-cut specimens without interleaves).
Anthony DB, Bacarreza Nogales OR, Shaffer MSP, et al., Crack arrest in finger jointed thermoplastic interleaved CFRC, 21st International Conference on Composite Materials
Pre-cut unidirectional carbon fibre prepreg (M21/194/34%/T800S) composites were tested in tension with a 20 mm overlapped finger joint architectures. In between the overlapping finger jointed region the effect of introducing polyethersulfone (PES) interleaves is investigated. Samples with the addition of a thick PES interleave arrested the initial crack which formed at the pre-cut site. The strain-to-failure of the thick PES interleaved samples was over 3.2%, an increase of 85% compared to the baseline samples, and catastrophic failure was delayed in the majority of instances.
Blaker JJ, Anthony DB, Tang G, et al., Carbon fibres with modulated properties and shape along the fibre length, 20th International Conference on Composite Materials, Publisher: ICCM
This paper presents a detailed experimental examination of the influence of the thickness of flatenergy directors (ED) on the ultrasonic welding (USW) process for carbon fibre/polyetherimidecomposites. Three thicknesses of flat ED were compared: 0.06 mm, 0.25 mm and 0.50 mm. Power anddisplacement data for 0.06 mm-thick EDs did not clearly show the stages of the process and thelocation of the optimum for best weld quality. Consequently, an investigation of samples welded atdifferent stages in the welding process had to be performed. For 0.06 mm-thick EDs, the optimum wasdetermined to occur at the beginning of the downward displacement of the sonotrode in the vibrationphase. The output parameters at the optimum conditions for all thicknesses were compared. Averagelap shear strength was found to be lowest for 0.06 mm-thick EDs. Based on the analysis of the fracturesurfaces, resin flakes and voids were observed when using the thinnest energy directors, indicatingthermal degradation. These observations suggest that thin energy directors are not as efficient asthicker EDs (i.e. 0.25 mm) to achieve preferential heat generation at the weld line, leading to lessconsistent weld quality.
Clancy A, Anthony DB, Shaffer M, Reactive Coagulation of Single-Walled Carbon Nanotubes for Tougher Composites – Solution Processing and Assembly, Polymer Processing Society Europe Africa Conference 2017 (PPS 2017) with 7th International Conference on Carbon NanoParticle Based Composites (CNPComp2017)
The injection of reduced single-walled carbon nanotubes into a coagulation bath of polyvinyl chloride (PVC) solution leads to the formation of nanocomposite fibres with polymer covalently bound to the nanotubes. The influence of PVC concentration and molecular weight, and the extrusion diameter on the nanocomposite fibre tensile properties and composition have been examined. The nanocomposite fibres produced have strengths as high as 480 MPa and modulus of 15 GPa, making them the strongest and stiffest PVC composites recorded to date.
De Luca, Anthony DB, Greenhalgh ES, et al., Continuous production of carbon nanotube-grafted quartz fibres: Effect of carbon nanotube length on fibre/matrix adhesion, 21st International Conference on Composite Materials
Here, the continuous production of carbon nanotube-grafted-quartz-fibres was performed in an open chemical vapour deposition reactor with continuous in line catalyst deposition. Highly graphitic carbon nanotubes (CNTs) with controllable lengths ranging from 0.1 μm to 20 μm were grown on the quartz fibre surface by adjusting the reduction and growth times, with shorter fibres growing homogeneously and longer CNTs growing in a splayed “Mohawk” manner. The effect of CNTs length (and thus microstructure) upon the mechanical properties of CNT-grafted-quartz-fibre/epoxy composites was investigated through single fibre pull-out test. The presence of a uniform coverage of sub-micron long CNTs led to an increase in interfacial shear strength of 11% and 29% when compared to sized and de-sized quartz fibres, respectively.
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