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Cho, Yoon-Kyoung
FRUITS Lab.
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Molecular tribology of lubricants and additives

Author(s)
Cho, Yoon-KyoungCai, LGranick, Steve
Issued Date
1997-12
DOI
10.1016/S0301-679X(97)00076-5
URI
https://scholarworks.unist.ac.kr/handle/201301/5922
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0031370307
Citation
TRIBOLOGY INTERNATIONAL, v.30, no.12, pp.889 - 894
Abstract
Knowledge of the bulk viscosity provides little guidance to predict accurately the interfacial shear strength and effective viscosity of a fluid in a lubricated contact. To quantify these differences between bulk and thin-film viscosity, an instrument was developed to measure the shear of parallel single crystal solids separated by molecularly-thin lubricant films. The effective shear viscosity is enhanced compared to the bulk, relaxation times are prolonged, and nonlinear responses set in at lower shear rates. These effects are more prominent, the thinner the liquid film. Studies with lubricant additives cast doubt on the usefulness of the concept of a friction coefficient for lubricated sliding.
Publisher
ELSEVIER SCI LTD
ISSN
0301-679X

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