ENCOUNTER EFFECTS ON THE DYNAMICS OF FLUCTUATIONS IN PHASE SEPARATIONS OF OFF-CRITICALLY QUENCHED BINARY-SYSTEMS

The encounter effect on the dynamics of fluctuations in phase separati ons of off-critically quenched binary systems is studied by performing three-dimensional computer simulations of the droplet growth model pr oposed recently by the authors. The dynamical behavior of the scatteri ng structure function, including the dynamical scaling, the temporal p ower laws. and the crossovers have been investigated. At higher volume fractions, the encounter effect is shown to strongly influence not on ly the dynamics of the single-droplet-size distribution function, lead ing to flattening and broadening of the distribution function, but als o the dynamics of fluctuations in phase- separating systems, leading t o sharpening and narrowing the structure function.