Amontonian frictional behaviour of nanostructured surfaces

Georgia A. Pilkington, Esben Thormann, Per M. Claesson, Gareth M. Fuge, Oliver J. L. Fox, Michael N. R. Ashfold, Hannah Leese, Davide Mattia, Wuge H. Briscoe

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

With nanotextured surfaces and interfaces increasingly being encountered in technological and biomedical applications, there is a need for a better understanding of frictional properties involving such surfaces. Here we report friction measurements of several nanostructured surfaces using an Atomic Force Microscope (AFM). These nanostructured surfaces provide well defined model systems on which we have tested the applicability of Amontons' laws of friction. Our results show that Amontonian behaviour is observed with each of the surfaces studied. However, no correlation has been found between measured friction and various surface roughness parameters such as average surface roughness (Ra) and root mean squared (rms) roughness. Instead, we propose that the friction coefficient may be decomposed into two contributions, i.e., μ = μ + μg, with the intrinsic friction coefficient μ accounting for the chemical nature of the surfaces and the geometric friction coefficient μg for the presence of nanotextures. We have found a possible correlation between μg and the average local slope of the surface nanotextures.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume13
Issue number20
Pages (from-to)9318-9326
ISSN1463-9076
DOIs
Publication statusPublished - 2011
Externally publishedYes

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