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Lubrication at Physiological Pressures by Polyzwitterionic Brushes
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Lubrication at Physiological Pressures by Polyzwitterionic Brushes
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Journal Article
Lubrication at Physiological Pressures by Polyzwitterionic Brushes
2009
Overview
The very low sliding friction at natural synovial joints, which have friction coefficients of μ < 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 μ 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.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Biological and medical sciences
/ Cartilage, Articular - physiology
/ Friction
/ Fundamental and applied biological sciences. Psychology
/ Humans
/ Ions
/ Joints
/ Mica
/ Monomers
/ Phosphorylcholine - analogs & derivatives
/ Phosphorylcholine - chemistry
/ Polymers
/ Pressure
/ Salts
/ Sliding
/ Vertebrates: osteoarticular system, musculoskeletal system
/ Water
