Rotational dynamics and friction in double-walled carbon nanotubes

Details Rotational dynamics and friction in double-walled carbon nanotubes Rotational dynamics and friction in double-walled carbon nanotubes

2006-06-09

arxiv.org/abs/cond-mat/0606234v1

Phys. Rev. Lett. 97, 186106 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submitted to PRL

Scientific paper

10.1103/PhysRevB.73.125428

We report a study of the rotational dynamics in double-walled nanotubes using molecular dynamics simulations and a simple analytical model reproducing very well the observations. We show that the dynamic friction is linear in the angular velocity for a wide range of values. The molecular dynamics simulations show that for large enough systems the relaxation time takes a constant value depending only on the interlayer spacing and temperature. Moreover, the friction force increases linearly with contact area, and the relaxation time decreases with the temperature with a power law of exponent $-1.53 \pm 0.04$.

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