Velocity dependence of friction during relative sliding motion of finite concentric carbon nanotubes

ORAL

Abstract

Carbon nanotubes are promising candidate materials for use in the construction of nanoscale mechanical devices. Indeed, some prototype mechanical elements such as linear and rotational bearings have already been realized experimentally. A crucial question for the ultimate functionalization of these devices is the efficiency with which they can operate. In this work the effects of friction on pristine nanotube-based mechanical devices are examined. Molecular dynamics simulations are used to study the rate and mechanism of dissipation of mechanical energy during relative motion (along the tube axis) of both capped and uncapped nanotubes moving inside a larger concentric carbon nanotube. A strong and complex dependence of dynamic friction on velocity is observed. Some unique features of friction in nanoscale devices are pointed out and it is shown how these features may be related to the observed behaviour. This work was supported by the Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.

–

Authors

  • Paul Tangney

    • The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley CA 94720

  • Stephen Fahy

    • Tyndall National Institute and Department of Physics, University College Cork, Ireland.
    • Tyndall National Institute and Department of Physics, University College Cork, Ireland
    • Tyndall National Institute, Ireland
    • Tyndall National Institute and Department of Physics, University College Cork

  • Marvin L. Cohen

    • Department of Physics, University of California at Berkeley, Berkeley CA 94720
    • UC Berkeley and Lawrence Berkeley National Laboratory
    • University of California at Berkeley and Lawrence Berkeley National Laboratory
    • Phys. Dept./UC Berkeley
    • University of California, Berkeley, and Lawrence Berkeley National Laboratory

  • Steven G. Louie

    • The Molecular Foundry, Lawrence Berkeley National Laboratory and Department of Physics, University of California at Berkeley, Berkeley CA 94720
    • University of California, Berkeley and Lawrence Berkeley National Laboratory
    • Department of Physics, University of California at Berkeley, and the Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
    • University of California, Berkeley, and Lawrence Berkeley National Laboratory