An elegant formula for coordinates of carbon atoms in a unit cell of a single-walled nanotube (SWNT) is presented and a new molecular motor of double-walled carbon nanotube whose inner tube is a long (8,4) SWNT and outer tube a short (14,8) SWNT is constructed. The interaction between inner an outer tubes is analytically derived by summing the Lennard-Jones potentials between atoms in inner and outer tubes. It is proved that the molecular motor in a thermal bath exhibits a directional motion with the temperature variation of the bath.
@article{arxiv.cond-mat/0301511,
title = {Molecular Motor of Double-Walled Carbon Nanotube Driven by Temperature Variation},
author = {Z. C. Tu and Z. C. Ou-Yang},
journal= {arXiv preprint arXiv:cond-mat/0301511},
year = {2009}
}