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Issue 41, 2016
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Size-dependent commensurability and its possible role in determining the frictional behavior of adsorbed systems

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Abstract

Recent nanofriction experiments of xenon on graphene revealed that the slip onset can be induced by increasing the adsorbate coverage above a critical value, which depends on temperature. Moreover, the xenon slippage on gold is much higher than on graphene in spite of the same physical nature of the interactions. To shed light on these intriguing results we have performed molecular dynamics simulations relying on ab initio derived potentials. By monitoring the interfacial structure factor as a function of coverage and temperature, we show that the key mechanism to interpret the observed frictional phenomena is the size-dependence of the island commensurability. The latter quantity is deeply affected also by the lattice misfit, which explains the different frictional behavior of Xe on graphene and gold.

Graphical abstract: Size-dependent commensurability and its possible role in determining the frictional behavior of adsorbed systems

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Publication details

The article was received on 03 Aug 2016, accepted on 26 Sep 2016 and first published on 26 Sep 2016


Article type: Paper
DOI: 10.1039/C6CP05386F
Citation: Phys. Chem. Chem. Phys., 2016,18, 28997-29004
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    Size-dependent commensurability and its possible role in determining the frictional behavior of adsorbed systems

    P. Restuccia, M. Ferrario, P. L. Sivestrelli, G. Mistura and M. C. Righi, Phys. Chem. Chem. Phys., 2016, 18, 28997
    DOI: 10.1039/C6CP05386F

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