Pair-interaction dependence of domain growth in binary fluids

摘要

We investigate domain growth in two-dimensional binary fluids at critical volume concentrations undergoing phase separation after a quench to the unstable region of the phase diagram. The dynamic process is analysed using molecular dynamics simulations with realistic interactions between particles. The systems we simulate are characterized by symmetric Lennard-Jones pair potentials with a reduced strength among unequal particles. We found that growth exponents at late times are dependent on the particular pair-interaction potential and on temperature. We study this dependence numerically for two different pair potentials and several temperatures. For very deep quenches the phase separation shows patterns in an aerogel structure where clusters coalesce in alternating A-B-A-B configurations at low densities and form 'spaghetti' features at higher densities. [References: 18]