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Atomistic simulation of frictional anisotropy on quasicrystal approximant surfaces

TitleAtomistic simulation of frictional anisotropy on quasicrystal approximant surfaces
Publication TypeJournal Article
Year of Publication2016
AuthorsYe, ZJ, Martini, A, Thiel, P, Lovelady, HH, McLaughlin, K, Rabson, DA
JournalPhysical Review B
Date Published06
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000378306000004
Keywords1st-principles interatomic potentials, Adhesion, al-ni-co, dynamics, excitations, phase-diagrams, physics, property, sliding friction, transition-metal aluminides, tribological properties

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. 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.

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Surface Structures

Alternate JournalPhys. Rev. B