Volume 2, Issue 3
MD Simulation of Structural and Mechanical Transformation of Single-Walled Carbon Nanotubes Under Pressure

J. Zang, O. Aldás-Palacios & F. Liu

DOI:

Commun. Comput. Phys., 2 (2007), pp. 451-465.

Published online: 2007-02

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  • Abstract

We investigate the structural and mechanical properties of single-walled carbon nanotubes (SWNTs) under hydrostatic pressure, using constant-pressure molecular dynamics (MD) simulations. We observed that all the SWNTs, independent of their size and chirality, behave like a classical elastic ring exhibiting a buckling transition transforming their cross-sectional shape from a circle to an ellipse. The simulated critical transition pressure agrees well with the prediction from continuum mechanics theory, even for the smallest SWNT with a radius of 0.4nm. Accompanying the buckling shape transition, there is a mechanical hardness transition, upon which the radial moduli of the SWNTs decrease by two orders of magnitude. Further increase of pressure will eventually lead to a second transition from an elliptical to a peanut shape. The ratio of the second shape transition pressure over the first one is found to be very close to a constant of ∼1.2, independent of the tube size and chirality.

  • Keywords

Carbon nanotube, high-pressure solid-state phase transformation, MD simulation.

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COPYRIGHT: © Global Science Press

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