Studies of microemulsions have resulted in a detailed understanding of
the properties of surfactant films. Progress have been made with resp
ect to both experimental methods and theoretical concepts. This paper
discusses how some of this knowledge can be used in emulsion studies,
in particular the role of the phase behavior, diffusion studies of bot
h microemulsions and macroemulsions, the implications of the flexible
surface model for emulsion stability and the Ostwald ripening process
in a potentially metastable emulsion system. By way of these examples
it is demonstrated how microemulsion research has helped to develop ou
r current understanding of macroemulsions. (C) 1997 Elsevier Science B
.V.