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Atomic scale friction in the function of modified Eyring activation energies

By W.W.F. Chong and Homer Rahnejat

Abstract

This article was published in the journal, Key Engineering Materials [© Trans Tech Publications]. The definitive version is available at: http://dx.doi.org/10.4028/www.scientific.net/KEM.642.3At microscale, friction is better understood fundamentally through hydrodynamic and elastohydrodynamic lubrication. However, the mechanisms governing friction at nanoscale remains a subject of interest. With the emergence of small-scale devices such as Microelectromechanical Systems (MEMS) and Nanoelectromechanical Systems (NEMS), there is a need to improve on the fundamental understanding of friction at diminishing gaps. Therefore, the paper investigates the friction of a simple fluid (n-hexadecane 99%) using an atomic force microscope. The measurements are interpreted using modified Eyring’s thermal activation energy approach in order to examine the effect of molecular solvation at the assumed smooth summit of asperities. It is found out that solvation for a sliding contact could be observed through the shear stress activation volume due to generated thermal energy, which indicates the movement of the fluid molecules into and out of the contact

Topics: Friction force microscopy, Modified Eyring thermal activation 'cage' model, Molecular solvation, Nanoscale friction, Potential energy barrier
Publisher: © Trans Tech Publications
Year: 2015
DOI identifier: 10.4028/www.scientific.net
OAI identifier: oai:dspace.lboro.ac.uk:2134/17977
Journal:

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