Please use this identifier to cite or link to this item: https://doi.org/16/005
Title: Surface profiles and modulation of ultra-thin perfluoropolyether lubricant in contact sliding
Authors: Sinha, S.K. 
Kawaguchi, M.
Kato, T.
Issue Date: 21-Aug-2004
Source: Sinha, S.K.,Kawaguchi, M.,Kato, T. (2004-08-21). Surface profiles and modulation of ultra-thin perfluoropolyether lubricant in contact sliding. Journal of Physics D: Applied Physics 37 (16) : 2247-2255. ScholarBank@NUS Repository. https://doi.org/16/005
Abstract: Deformation in shear and associated tribological behaviours of ultra-thin lubricants are of significant importance for the lubrication of magnetic hard disks and for other applications such as micro-electromechanical systems, nano-fluidics and nanotechnology. This paper presents the characteristics of the perfluoropolyether ultra-thin lubricant, in terms of its surface profiles when subjected to a contact sliding test. The results indicate that for a several-monolayers thick (∼4.0-4.5 nm) lubricant film, sliding produces a considerable amount of surface roughness due to peaks of lubricant that persist during sliding; however, it can flow back or return to a smooth profile after a lapse of time when the sliding is stopped. For a monolayer-thin (∼1.4-1.57 nm) film, the lubricant flow is restricted, and the rough profile created due to sliding persists and almost becomes permanent on the wear track. During sliding, due to high shear stress, a characteristic feature of lubricant profile modulation is observed. This modulation, or waviness, is due to the accumulation of lubricant in piles or islands, giving certain amplitudes and frequencies, which themselves depend upon the percentage of lubricant molecules that are chemically bonded to the substrate and the lubricant thickness. The results indicate that ultra-thin lubricants (monolayer and thicker) behave more like a semi-solid (having some sliding characteristics similar to those of rubbers) than a liquid when subjected to a high shear rate during contact sliding.
Source Title: Journal of Physics D: Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/61437
ISSN: 00223727
DOI: 16/005
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

28
checked on Dec 7, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.