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Attraction induced frictionless sliding of rare gas monolayer on metallic surfaces: an efficient strategy for superlubricity

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Abstract

Friction on a nanoscale revealed rich load-dependent behavior, which departs strongly from the long-standing Amonton's law. Whilst electrostatic repulsion-induced friction collapse for rare gas sliding over metallic surfaces in a high-load regime was reported by Righi et al. (Phys. Rev. Lett., 2007, 99, 176101), the significant role of attraction on frictional properties has not been reported to date. In this study, the frictional motion of Xe/Cu(111), Xe/Pd(111) and Ar/Cu(111) was studied using van der Waals corrected density functional calculations. An attraction-induced zero friction, which is a signal of superlubricity, was found for the sliding systems. The superlubric state results from the disappearance of the potential corrugation along the favored sliding path as a consequence of the potential crossing in the attractive regime when the interfacial pressure approaches a critical-value. The finding of an attraction-driven friction drop, together with the repulsion-induced collapse in the high-load regime, which breaks down the classic Amonton's law, provides a distinct approach for the realization of inherent superlubricity in some adsorbate/substrate interfaces.

Graphical abstract: Attraction induced frictionless sliding of rare gas monolayer on metallic surfaces: an efficient strategy for superlubricity

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Publication details

The article was received on 28 Dec 2016, accepted on 20 Mar 2017 and first published on 22 Mar 2017


Article type: Paper
DOI: 10.1039/C6CP08857K
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Attraction induced frictionless sliding of rare gas monolayer on metallic surfaces: an efficient strategy for superlubricity

    J. Sun, Y. Zhang, Z. Lu, Q. Xue and L. Wang, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C6CP08857K

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