Model for Pressure Induced Deformations in Carbon Nanotube Materials

Details Model for Pressure Induced Deformations in Carbon Nanotube Materials Model for Pressure Induced Deformations in Carbon Nanotube Materials

2004-09-29

arxiv.org/abs/cond-mat/0409733v1

Physics

Condensed Matter

Materials Science

11 pages, 8 figures and 15 references

Scientific paper

We report the results of a model calculation for studying the effects of hydrostatic pressure on a bunch of carbon nanotubes. At pressures that we work with, the deformation in axial direction comes out to be negligibly small. We find that hydrostatic pressure is an ideal probe to study the radial deformations of the nanotubes. The nanotubes are considered to be flexible, identified by a flattening of cylinders under pressure through a parameter f. We use the 6-exponential and Brenner potentials to account for inter and intra-tube interactions respectively. We calculate the total energy of the deformed tubes in bunches. The free energy thus calculated enables us to calculate phase changes at various pressures. From our calculations, we find the phase transformation to occur at about 5GPa.

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