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Friction of water film


Paliy, M; Braun, OM; Consta, S. 2006. The friction properties of an ultrathin confined water film. TRIBOLOGY LETTERS 23 (1): 7-14.
Author Full Name(s): Paliy, M.; Braun, O. M.; Consta, S.
Author Keywords:
nanotribology; boundary lubrication friction; dynamic modelling; friction mechanisms; static friction; stick-slip
Keywords Plus:
CENTRAL-FORCE MODEL; BILAYER ICE; LIQUID; PHASE; TRANSITION; LAYERS
Abstract:

An ultrathin water film confined between two substrates in moving contact is studied using Langevin molecular dynamics with coordinate- and velocity-dependent damping coefficient. The correlations between the structure of the water lubricant film and its frictional properties are found in a wide range of applied loads and for various strengths of interactions between water and surfaces. A self-organization of the film into a low-friction state under driving is observed to occur. Surprisingly, it is found that the "hydrophilic" surfaces exhibit a lower friction than the "hydrophobic" ones. The viscosity of the confined water estimated from the simulations is in a good agreement with the experimental value.