Stick-Slip Control in Nanoscale Boundary Lubrication by Surface Wettability

被引：44
|
作者：
Chen, Wei [1 ,2 ]
Foster, Adam S. [1 ]
Alava, Mikko J. [1 ]
Laurson, Lasse [1 ]
机构：
[1] Aalto Univ, Dept Appl Phys, COMP Ctr Excellence, Espoo 00076, Finland
[2] Chinese Acad Sci, Comp Network Informat Ctr, Supercomp Ctr, Beijing 100190, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 09期
基金：
芬兰科学院;
关键词：
FRICTION; WATER; WEAR; FLOW;
D O I：
10.1103/PhysRevLett.114.095502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：5
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