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Boundary Lubricants with Exceptionally Low Friction Coefficients Based on 2D Close‐Packed Phosphatidylcholine Liposomes
Author(s) -
Goldberg Ronit,
Schroeder Avi,
Silbert Gilad,
Turjeman Keren,
Barenholz Yechezkel,
Klein Jacob
Publication year - 2011
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201101053
Subject(s) - phosphatidylcholine , liposome , materials science , lubrication , vesicle , boundary lubrication , friction coefficient , phase (matter) , boundary (topology) , chemical engineering , chromatography , composite material , nanotechnology , organic chemistry , phospholipid , chemistry , membrane , mathematics , mathematical analysis , biochemistry , engineering
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.