Stick-Slip Control in Nanoscale Boundary Lubrication by Surface Wettability
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2015
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Mcode
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Language
en
Pages
5
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Physical Review Letters, Volume 114, issue 9, pp. 1-5
Abstract
We study the effect of atomic-scale surface-lubricant interactions on nanoscale boundary-lubricated friction by considering two example surfaces—hydrophilic mica and hydrophobic graphene—confining thin layers of water in molecular dynamics simulations. We observe stick-slip dynamics for thin water films confined by mica sheets, involving periodic breaking-reforming transitions of atomic-scale capillary water bridges formed around the potassium ions of mica. However, only smooth sliding without stick-slip events is observed for water confined by graphene, as well as for thicker water layers confined by mica. Thus, our results illustrate how atomic-scale details affect the wettability of the confining surfaces and consequently control the presence or absence of stick-slip dynamics in nanoscale friction.Description
Keywords
friction, lubrication, molecular dynamics
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Citation
Chen, W, Foster, A S, Alava, M J & Laurson, L 2015, ' Stick-Slip Control in Nanoscale Boundary Lubrication by Surface Wettability ', Physical Review Letters, vol. 114, no. 9, 095502, pp. 1-5 . https://doi.org/10.1103/PhysRevLett.114.095502