Lubrication at Physiological Pressures by Polyzwitterionic Brushes
Lubrication at Physiological Pressures by Polyzwitterionic Brushes
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DOI：
10.1126/science.1169399
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发表时间：
2009-03-27
期刊：
影响因子：
56.9
通讯作者：
Klein, Jacob
中科院分区：
文献类型：
--
作者：
Chen, Meng;Briscoe, Wuge H.;Klein, Jacob
天然滑膜关节的滑动摩擦非常低，在高达 5 兆帕或更高的压力下摩擦系数为 mu < 0.002，迄今为止在任何人造关节或水环境中的模型表面之间尚未实现。我们发现直接从表面聚合的含水聚两性离子刷的表面在高达 7.5 兆帕的压力下可具有低至 0.0004 的 m 值。这种极端的润滑主要归因于构成牢固附着的刷子的磷酸胆碱类单体的强烈水合作用，并且可能与各种人造水性润滑情况有关。
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.