Dynamic Equations of Surfactants and Surfaces

抄録

We present a general theory of dynamics of two-component surfactants on surfaces separating two fluids. The surface free energy consists of two contributions: one is determined by the surface curvature and the surfactant densities and the other is the gradient part arising from areal inhomogeneities of the surfactant densities. Our dynamic equations together with generalized boundary conditions at the surface can be used to describe highly nonlinear phenomena in which phase separation and surface deformations are coupled. Our theory can also be reformulated for cases with a nonconserved order parameter.