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Science 26 August 2005:
Vol. 309. no. 5739, pp. 1354 - 1356
DOI: 10.1126/science.1113239
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Reports

High Frictional Anisotropy of Periodic and Aperiodic Directions on a Quasicrystal Surface

Jeong Young Park,1 D. F. Ogletree,1 M. Salmeron,1* R. A. Ribeiro,2 P. C. Canfield,2 C. J. Jenks,2 P. A. Thiel2

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.

1 Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA.
2 Ames Laboratory and Departments of Chemistry, Physics and Astronomy, and Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA.

* To whom correspondence should be addressed. E-mail: mbsalmeron{at}lbl.gov

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Electronic control of friction in silicon pn junctions..
J. Y. Park, D. F. Ogletree, P. A. Thiel, and M. Salmeron (2006)
Science 313, 186
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