Multi-scale mechanical improvement produced in carbon nanotube fibers by irradiation cross-linking

Filleter, Tobin; Espinosa, Horacio D.

doi:10.1016/j.carbon.2012.12.016

Cited by 98 publications

(76 citation statements)

References 55 publications

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“…However, at the same time, an approach to enhance their packing density may have sense, as it was shown above that even the simple densification by acetone spraying may increase the tensile strength and stiffness of the as-spun materials. Some reported treatments, such as UV [39] or electron-beam irradiation [40], twisting, and infiltration with polymeric compounds [41][42][43][44] appear to affect lateral interactions between nanotube bundles, as well as molecular level couplings between nanotubes and polymer chains [43], thus amplifying the mechanical performance of CNT fibres or yarns [44] (supplementary materials, S10). Remembering the hierarchical structure of the CNT fibres, upon polymer infiltration, a fibre itself can be regarded as a nanostructural composite [13,43] with 50-70 % of a fibre occluded with a polymer depending on the fibre's internal porosity.…”

Section: Discussion Two Areas Of Comparisonmentioning

confidence: 99%

Aligned carbon nanotube–epoxy composites: the effect of nanotube organization on strength, stiffness, and toughness

2016

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A protocol has been developed for the production of epoxy-based composites containing high-volume fractions of aligned carbon nanotubes. The nanotubes were fabricated as continuous fibres or aligned mats directly from the CVD reactor, in which they were synthesized. The block composites with highly aligned and tightly packed nanotube assemblies were prepared via epoxy resin infiltration, and their volume fraction, distribution, and internal porosity being analysed prior to mechanical testing. The samples were tested in both axial tension and three-point bending. The results show that the strength and stiffness enhancements were close to pro rata with the volume fraction of the carbon nanotubes added. The failure modes were distinctly different from those characteristic of the conventional aligned carbon fibre composites. The fracture surface showed considerable evidence of pull-out of bundles of (*50) nanotubes, but the pull-out appeared to involve the resin matrix which drew out along with the bundles. Subsidiary cracks were bridged by nanotube bundles giving structures reminiscent of crazes in glassy polymers, what constitutes the distinct toughness mechanism and higher resistance to the transverse cracks propagation.

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Section: Discussion Two Areas Of Comparisonmentioning

confidence: 99%

Aligned carbon nanotube–epoxy composites: the effect of nanotube organization on strength, stiffness, and toughness

2016

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“…As a supporting matrix, CNTs can offer high surface area and specific functional groups for efficient adsorption of reactants [43,44]. CNTs are also famous for their high mechanical strength, making them suitable for a large number of applications [45][46][47][48]. Their properties of excellent conductivity and 1D structure make them an ideal candidate co-catalyst for photocatalyts [49].…”

Section: D Nanocarbon Materials As Co-catalystsmentioning

confidence: 99%

Nanocarbons with Different Dimensions as Noble-Metal-Free Co-Catalysts for Photocatalysts

Shen

et al. 2016

Catalysts

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Abstract:In this review, we provide an overview of recent progress in nanocarbons with different dimensions as noble-metal-free co-catalysts for photocatalysts. We put emphasis on the interface engineering between nanocarbon co-catalysts and various semiconductor photocatalysts and the novel properties generating of nanocarbon co-catalysts, also including the synthesis and application of nanocarbon-based photocatalyst composites.

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“…Suppose it is desired to increase the stiffness of the mirror substrate, one can, for example, employ single wall CNTs, 18 vary the diameter and length/diameter ratio of the CNTs, functionalize the nanotubes to enhance bonding to the matrix, use special processing procedures and/or coupling agents, or incorporate micro-or macrosize fillers to make multiscale composite structures. 19,20 4.5 Implementing Active Optics…”

Section: Cnt/e As An Optical Materialsmentioning

confidence: 99%

Carbon nanotube optical mirrors

Chen

Rabin

2014

J. Astron. Telesc. Instrum. Syst

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Abstract. We report the fabrication of imaging quality optical mirrors with smooth surfaces using carbon nanotubes (CNT) embedded in an epoxy matrix. CNT/epoxy is a multifunctional composite material that has sensing capabilities and can be made to incorporate self-actuation. Moreover, as the precursor is a low density liquid, large and lightweight mirrors can be fabricated by processes such as replication, spincasting, and three-dimensional printing. Therefore, the technology holds promise for the development of a new generation of lightweight, compact "smart" telescope mirrors with figure sensing and active or adaptive figure control. We report on measurements made of optical and mechanical characteristics, active optics experiments, and numerical modeling. We discuss possible paths for future development.

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Multi-scale mechanical improvement produced in carbon nanotube fibers by irradiation cross-linking

Cited by 98 publications

References 55 publications

Aligned carbon nanotube–epoxy composites: the effect of nanotube organization on strength, stiffness, and toughness

Aligned carbon nanotube–epoxy composites: the effect of nanotube organization on strength, stiffness, and toughness

Nanocarbons with Different Dimensions as Noble-Metal-Free Co-Catalysts for Photocatalysts

Carbon nanotube optical mirrors

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