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Lubrication at physiological pressures by polyzwitterionic brushes

Chen, M., Briscoe, W.H., Armes, S.P. and Klein, J. (2009) Lubrication at physiological pressures by polyzwitterionic brushes. Science, 323 (5922). pp. 1698-1701. ISSN 0036-8075

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Abstract

The very low sliding friction at natural synovial joints, which have friction coefficients of mu < 0.002 at pressures up to 5 megapascals or more, has to date not been attained in any human-made joints or between model surfaces in aqueous environments. We found that surfaces in water bearing polyzwitterionic brushes that were polymerized directly from the surface can have m values as low as 0.0004 at pressures as high as 7.5 megapascals. This extreme lubrication is attributed primarily to the strong hydration of the phosphorylcholine-like monomers that make up the robustly attached brushes, and may have relevance to a wide range of human-made aqueous lubrication situations.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 American Association for the Advancement of Science. This is an author produced version of a paper subsequently published in Science. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: BOUNDARY LUBRICATION; FRICTIONAL FORCES; POLYMER; SURFACE; LAYERS; HYDRATION; QUALITY; CHAINS
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 28 Apr 2009 16:52
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1126/science.1169399
Status: Published
Publisher: American Association for the Advancement of Science
Refereed: Yes
Identification Number: 10.1126/science.1169399
URI: http://eprints.whiterose.ac.uk/id/eprint/8528

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