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Simulations of friction anisotropy on ordered organic monolayer

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Abstract

A method of molecular dynamics is used to investigate friction anisotropy observed on a hexagonally packed organic monolayer of straight-chain molecules, which tilt in a specific direction. A rigid gold slider with a single atomic protuberance is used as a model of a typical atomic force microscope tip apex. The friction anisotropy is observed at 50 K, which is below the melting point of rotation around a long axis of the molecule. The anisotropic frictional behavior is that sliding in directions normal to the direction of the collective tilt of the molecules results in the maximum friction force. The origin of the anisotropy is attributed to anisotropy in lateral compliance in the monolayer.

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Authors and Affiliations

  1. Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8501, Japan

    Takuya Ohzono & Masamichi Fujihira

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  1. Takuya Ohzono
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  2. Masamichi Fujihira
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Ohzono, T., Fujihira, M. Simulations of friction anisotropy on ordered organic monolayer. Tribology Letters 9, 63–67 (2000). https://doi.org/10.1023/A:1018804410641

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