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Comportement mécanique et
électrique des enchevêtrements de
nanotubes de carbone

Abstract : Carbon nanotubes (CNT) are tubular macromolecules with remarkable mechanical and chemiphysical properties.
Since the years 70's and before, micrographies of CNT can be found, in particular, in the thesis of Endo at LMM
of Pau in France. But it was not before the detailed analysis of their structure by Iijima in 1991 that their intrinsic properties were studied in an intensive way. Applications considered are almost unlimited (nanoelectronics, composites, field emission, gas detectors, . . . ). Although the majority of these applications bring into play a set of nanotubes, paradoxically, few studies of their collective behaviour were conducted. This work lies within this scope and aims at bringing some explanations concerning the mechanical and electrical behaviour of the CNT tangles. This work comprises three principal parts: CNT/epoxy composites, van der Waals (vdW) interactions between CNT and the mechanical and electrical behaviour of the tangles of CNT in confined uniaxial compression tests.
The study of the composites allowed to evaluate some individual properties of CNT by the inverse method. With
the nanometric scale, vdW forces dominate, a CNT-CNT potential was thus developed. The Van Wyk model describes in a satisfactory way the micrometric fibre tangles. A modification of this model incorporating vdW interactions is proposed to describe the CNT tangles. The slow logarithmic stress relaxation in CNT tangles was attributed to the glide of a CNT on another. A model of parallel resistance network is proposed to describe the evolution of the ohmic resistance of CNT tangles under compression.
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Submitted on : Monday, March 13, 2006 - 4:33:20 AM
Last modification on : Wednesday, July 8, 2020 - 11:10:20 AM
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Aïssa Allaoui. Comportement mécanique et
électrique des enchevêtrements de
nanotubes de carbone. Mécanique [physics.med-ph]. Ecole Centrale Paris, 2005. Français. ⟨tel-00011929⟩

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