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8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

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Thu 811:<strong>10</strong>-14:00P7.29Coarse-grained simulations of kinetic-frictionmodification in confined complex fluidsMatthew Farrow 1 and Philip Camp 11 The University of Edinburgh, School of Chemistry, West Mains Road EH9 3JJ, Edinburgh,United KingdomLangevin dynamics using coarse-grained bead-spring model beads were used to explore kineticfrictionmodification of complex fluids confined between parallel planar walls under shear. Themodels reflect the essential solvophobic and solvophilic natures of the chemical groups that makeup the friction modifiers (additives) in base oil. The degree of friction modification was surveyedas a function of wall separation, wall sliding velocity (shear rate), additive molecular weight andarchitecture, and oil-additive composition. As a rule, the kinetic-friction was found to increasefirst linearly then logarithmically with increasing sliding velocity. The results for different additivemolecules show some subtle but systematic effects that indicate an optimum molecular weight andarchitecture for kinetic-friction modification.29

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