SOLUTE-ENHANCED DIFFUSION IN A DENSE 2-DIMENSIONAL LIQUID

Self-diffusion in dense two-dimensional liquids consisting of mixtures of soft disks is studied using constant-temperature-constant-pressure molecular dynamics simulations. At low solute concentrations, both th e solute and solvent diffusion constants are found to exhibit a nonmon otonic dependence on the solute diameter. The anomalously high diffusi on of the solute is shown to arise from the disruption of the local so lvent structure and the resulting increase in the solvent mobility.