PAIR-INTERACTION DEPENDENCE OF DOMAIN GROWTH IN BINARY FLUIDS

We investigate domain growth in two-dimensional binary fluids at criti cal volume concentrations undergoing phase separation after a quench t o the unstable region of the phase diagram. The dynamic process is ana lysed using molecular dynamics simulations with realistic interactions between particles. The systems we simulate are characterized by symme tric Lennard-Jones pair potentials with a reduced strength among unequ al particles. We found that growth exponents at late times are depende nt on the particular pair-interaction potential and on temperature. We study this dependence numerically for two different pair potentials a nd several temperatures. For very deep quenches the phase separation s hows patterns in an aerogel structure where clusters coalesce in alter nating A-B-A-B configurations at low densities and form 'spaghetti' fe atures at higher densities.