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Ronit Goldberg, Avi Schroeder, Gilad Silbert, Keren Turjeman, Yechezkel Barenholz and Jacob Klein Boundary Lubricants with Exceptionally Low Friction Coefficients Based on 2D Close-Packed Phosphatidylcholine Liposomes Advanced Materials 23

Version of Record online: 4 JUL 2011 | DOI: 10.1002/adma.201101053

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Liposomes of hydrogenated soy phosphatidylcholine (PC) lipids spontaneously self-assemble in close-packed layers on solid surfaces to form boundary lubricants that reduce the coefficient μ of sliding friction between them down to μ ≈ 10−4 – 2 × 10−5, at pressures up to ca. 12 MPa. This strikingly low value is attributed to hydration-lubrication by the PC headgroups exposed at the surfaces of the gel-phase vesicles.

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