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Atomistic simulation of frictional anisotropy on quasicrystal approximant surfaces [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 235,438 : digital, PDF file
Additional Creators
Ames Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, National Science Foundation (U.S.), and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
J. Y. Park et al. [Science 309, 1354 (2005)] have reported eight times greater atomic-scale friction in the periodic than in the quasiperiodic direction on the twofold face of a decagonal Al-Ni-Co quasicrystal. Here we present results of molecular-dynamics simulations intended to elucidate mechanisms behind this giant frictional anisotropy. Simulations of a bare atomic-force-microscope tip on several model substrates and under a variety of conditions failed to reproduce experimental results. On the other hand, including the experimental passivation of the tip with chains of hexadecane thiol, we reproduce qualitatively the experimental anisotropy in friction, finding evidence for entrainment of the organic chains in surface furrows parallel to the periodic direction.
Report Numbers
E 1.99:is-j--9046
is-j--9046
Subject(s)
Note
Published through SciTech Connect.
06/23/2016.
"is-j--9046"
Physical Review B 93 23 ISSN 2469-9950; PRBMDO AM
Zhijiang Ye; Ashlie Martini; Patricia Thiel; Heather H. Lovelady; Keith McLaughlin; David A. Rabson.
Funding Information
AC02-07CH11358
CHE 1531590
CMMI-1362565
View MARC record | catkey: 24055815