High Frictional Anisotropy of Periodic and Aperiodic Directions on a Quasicrystal Surface
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- 26 August 2005
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 309 (5739) , 1354-1356
- https://doi.org/10.1126/science.1113239
Abstract
Strong friction anisotropy is found when the twofold surface of an atomically clean aluminum-nickel-cobalt quasicrystal slides against a thiol-passivated titanium-nitride tip. Friction along the aperiodic direction is one-eighth as much as that along the periodic direction. This anisotropy, which is about three times as large as the highest value observed in anisotropic crystalline surfaces, disappears after the surface is oxidized in air. These results reveal a strong connection between interface atomic structure and the mechanisms by which energy is dissipated, which likely include electronic or phononic contributions, or both.Keywords
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