Two-phase flow with surfactants: Diffuse interface models and their   analysis
  New diffuse interface and sharp interface models for soluble and insoluble surfactants fulfilling energy inequalities are introduced. We discuss their relation with the help of asymptotic analysis and present an existence result for a particular diffuse interface model. 
Helmut Abels, Harald Garcke, Kei Fong Lam, Josef Weber
physics.flu-dyn math.AP