Journal ArticleDOI
Compressibility and Polygonization of Single-Walled Carbon Nanotubes under Hydrostatic Pressure
Jie Tang,Lu Chang Qin,Taizo Sasaki,Masako Yudasaka,Akiyuki Matsushita,Sumio Iijima,Sumio Iijima +6 more
TLDR
Theoretical calculations suggest that single-walled carbon nanotubes are polygonized when they form bundles of hexagonal close-packed structure and the intertubular gap is smaller than the equilibrium spacing of graphite.Abstract:
Single-walled carbon nanotubes show linear elasticity under hydrostatic pressure up to 1.5 GPa at room temperature. The volume compressibility, measured by in situ synchrotron x-ray diffraction, has been determined to be $0.024\mathrm{GPa}{}^{\ensuremath{-}1}$. Theoretical calculations suggest that single-walled carbon nanotubes are polygonized when they form bundles of hexagonal close-packed structure and the intertubular gap is smaller than the equilibrium spacing of graphite (002) $(d\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3.35\phantom{\rule{0ex}{0ex}}\AA{})$. It has also been determined that the deformation of the trigonal nanotube lattice under hydrostatic pressure is reversible up to 4 GPa, beyond which the nanotube lattice is destroyed.read more
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Ultrahigh pressure macro diamonds from Copeton (New South Wales, Australia), based on Raman spectroscopy of inclusions
TL;DR: In this article, Raman spectroscopy is used to identify included minerals within uncut Copeton diamonds, with sealed chamber remnant pressures of 31.7 to 35.6 and 22.6 to 22.7, respectively.
Journal ArticleDOI
High-pressure behaviors of carbon nanotubes
TL;DR: In this paper, the experimental and theoretical studies on pressure-induced polygonization, ovalization, racetrack shape deformation, and polymerization of carbon nanotubes (CNTs) have been discussed.
Journal ArticleDOI
Robust linear dependence of thermal conductance on radial strain in carbon nanotubes
TL;DR: In this paper, a detailed analysis of phonon transmission reveals that an elastic radial strain can be viewed as a perturbation of the transport of most of the low-frequency phonons.
Journal ArticleDOI
Compression of polyhedral graphite up to 43 GPa and x-ray diffraction study on elasticity and stability of the graphite phase
TL;DR: The crystal structure of polyhedral graphite particles (G balls) has been investigated under pressure up to 43 GPa and at room temperature by x-ray powder diffraction measurements as discussed by the authors.
Journal ArticleDOI
Chain Model for Carbon Nanotube Bundle under Plane Strain Conditions
Elena A. Korznikova,Leysan Khalilovna Rysaeva,Aleksandr Vasiljevich Savin,E. G. Soboleva,Evgeny Grigorjevich Ekomasov,Marat Ilgamov,Sergey V. Dmitriev,Sergey V. Dmitriev +7 more
TL;DR: An atomistic chain model is proposed to analyze the mechanical response of CNT bundles under plane strain conditions and is able to describe large curvature of the CNT wall and the fracture of the walls at very high pressures, where both of these problems are difficult to address in frame of continuum mechanics models.