Atomistic Simulation of frictional anisotropy on quasicrystal approximant surfaces
Materials Science
2016-06-29 v2
Abstract
Park {\it et al.} have reported eight times greater atomic-scale friction in the periodic than in the quasiperiodic direction on the two-fold face of a decagonal Al-Ni-Co quasicrystal. 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.
Keywords
Cite
@article{arxiv.1512.02305,
title = {Atomistic Simulation of frictional anisotropy on quasicrystal approximant surfaces},
author = {Zhijiang Ye and Ashlie Martini and Patricia Thiel and Heather H. Lovelady and Keith McLaughlin and David A. Rabson},
journal= {arXiv preprint arXiv:1512.02305},
year = {2016}
}