Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-08-11
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 5 figures
Scientific paper
Solids at incommensurate contact display low-friction, 'superlubric', sliding. For graphene flakes on a graphite surface, superlubric sliding is only temporary due to rotation of the flakes from incommensurate to commensurate contact with the substrate. We examine this rotational channel of friction in a prototype geometry of meso- and macroscopic solid lubrication. By molecular dynamics simulations and theoretical arguments we find that two surfaces lubricated by mobile, rotating graphene flakes exhibit stable superlubric sliding as for ideally incommensurate contacts also when they are covered by randomly oriented pinned graphene patches. For commensurate surfaces, we find a low friction state at low temperature where incommensurate states are not destroyed by thermal fluctuations.
de Wijn Astrid S.
Fasolino Annalisa
Filippov Eh. A.
Urbakh Michael
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