Journal
SCIENCE
Volume 323, Issue 5922, Pages 1698-1701Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1169399
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Funding
- Engineering and Physical Sciences Research Council
- Petroleum Research Fund [45694-AC7]
- Charles McCutchen Foundation
- Minerva Foundation at the Weizmann Institute
- Engineering and Physical Sciences Research Council [EP/C535421/1] Funding Source: researchfish
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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.
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