Simulation of Scan-Directional Dependence of Superlubricity of C60 Molecular Bearings and Graphite

概要

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The scan-directional dependence of the superlubricity of a C60 molecular bearing system (graphite/C60/graphite interface) is studied and compared with that of a graphite system (graphite/graphite/graphite interface) by molecular mechanics simulation. The mean lateral force $\langle F_{\text{L}} \rangle$ reaches a maximum within a narrow region approximately in the $[10\bar{1}0]$ direction. For other regions, $\langle F_{\text{L}} \rangle$ has a nearly constant value of less than 1 pN. In particular, in the $[12\bar{3}0]$ direction, $\langle F_{\text{L}} \rangle$ reaches a minimum of nearly zero. It is clarified that $\langle F_{\text{L}} \rangle$ reflects the following types of C60 motion: sliding above the carbon bond and a discrete slip to the neighboring AB-stacking position. The load dependence of $\langle F_{\text{L}} \rangle$ also exhibits marked anisotropy. The orders of magnitude of the simulated friction coefficients are comparable to those obtained in our previous experiments.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2009-06-25