Recent progress in emulsions and emulsion technology used in many fields is summarized. This paper deals mainly with definition, properties of microemulsion and macroemulsion, their applications in cosmetic, medical, and food fields, preparation of middle phase microemulsions, preparation and properties of multiple emulsions, zeta-potential of microemulsions, emulsionliquid membranes, and flotation separation of O/W type microemulsion.
