Nonequilibrium molecular dynamics simulations of stearic acid adsorbed on iron surfaces with nanoscale roughness
File(s)
Published version
Author(s)
Ewen, J
Echeverri Restrepo, S
Morgan, N
Dini, D
Type
Journal Article
Abstract
Nonequilibrium molecular dynamics (NEMD) simulations have been used to examine the structure and friction of stearic acid films adsorbed on iron surfaces with nanoscale roughness. The effect of pressure, stearic acid coverage, and level of surface roughness were investigated. The direct contact of asperities was prevented under all of the conditions simulated due to strong adsorption, which prevented squeeze-out. An increased coverage generally resulted in lower lateral (friction) forces due to reductions in both the friction coefficient and Derjaguin offset. Rougher surfaces led to more liquidlike, disordered films; however, the friction coefficient and Derjaguin offset were only slightly increased. This suggests that stearic acid films are almost as effective on contact surfaces with nanoscale roughness as those which are atomically-smooth.
Editor(s)
Liu, W
Date Issued
2016-11-26
Date Acceptance
2016-11-24
Citation
Tribology International, 2016, 107, pp.264-273
ISSN
1879-2464
Publisher
Elsevier
Start Page
264
End Page
273
Journal / Book Title
Tribology International
Volume
107
Copyright Statement
© 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Sponsor
Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Grant Number
PIAP-GA-2013-612306
EP/N025954/1
Subjects
Mechanical Engineering & Transports
0913 Mechanical Engineering
Publication Status
Published