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Atomic-scale sliding friction on a contaminated surface
Stockholm University, Faculty of Science, Department of Physics. Norwegian University of Science and Technology, Norway.
Number of Authors: 32018 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 10, no 14, p. 6375-6381Article in journal (Refereed) Published
Abstract [en]

Using non-equilibrium molecular dynamic simulations, we investigate the effect of adsorbates on nano-scopic friction. We find that the interplay between different channels of energy dissipation at the frictional interface may lead to non-monotonic dependence of the friction force on the adsorbate surface coverage and to strongly nonlinear variation of friction with normal load (non-Amontons' behavior). Our simulations suggest that the key parameter controlling the variation of friction force with the normal load, surface coverage and temperature is the time-averaged number of adsorbates confined between the tip and the substrate. Three different regimes of temperature dependence of friction in the presence of adsorbates are predicted. Our findings point on new ways to control friction on contaminated surfaces.

Place, publisher, year, edition, pages
2018. Vol. 10, no 14, p. 6375-6381
National Category
Physical Sciences Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-156735DOI: 10.1039/c7nr09530aISI: 000429530400018PubMedID: 29560981OAI: oai:DiVA.org:su-156735DiVA, id: diva2:1219922
Available from: 2018-06-18 Created: 2018-06-18 Last updated: 2018-06-18Bibliographically approved

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Ouyang, Wengende Wijn, Astrid S.
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