Stick-Slip Control in Nanoscale Boundary Lubrication by Surface Wettability

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015
Major/Subject
Mcode
Degree programme
Language
en
Pages
5
1-5
Series
PHYSICAL REVIEW LETTERS, Volume 114, issue 9
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
Other note
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