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.

引用

页数：5

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