Abstract
Radial confinement and specific boundary conditions lead to inhomogeneous spatial distributions for conduction electrons in metallic carbon nanotubes.Such uneven spread of negative charge on the surface of a carbon nanotube can induce Coulomb-type interactions between parallel tubes, contributing to the relative friction. Thus, the axial conduction electron density on a single idealized carbon nanotube closed at both ends was obtained in the framework of the two-dimensional quasi-free electron approximation. A Coulomb potential energy between two parallel nanotubes was calculated as a function of the longitudinal offset between them. The study provides a simple method for estimating the friction force related to Coulomb inter-tube interactions appearing during a parallel sliding motion, with implications in the stretching resistance of various carbon nanotube bundles and in designing various nano-electromechanical devices.
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