INTERFACE ROUGHENING IN A HYDRODYNAMIC LATTICE-GAS MODEL WITH SURFACTANT

Using a hydrodynamic lattice-gas model, we study interface growth in a binary fluid with various concentrations of surfactant. We find that the interface is smoothed by small concentrations of surfactant, while microemulsion droplets form for large surfactant concentrations. To a ssist in determining the stability limits of the interface, we calcula te the change in the roughness and growth exponents ct and beta as a f unction of surfactant concentration along the interface.