Electrokinetic Studies in the Stability of Multiphase Emulsion Systems

Abstract

The stability of an emulsion may be a function of the electrical properties at the interface as the mutual repulsion of the charged particles prevent their close approach. The measurement of these electrical properties may be of importance in stability studies. The parameter of interest is often the zeta potential, which can be obtained by measuring the electrophoretic inability of the droplets. The electrophoretic mobility changes of emulsion droplets were studied periodically by means of the Rank's Brothers Mark 11 particle microelectrophoretic apparatus. Over the ten-week study period the electrophoretic mobilities of the droplets did not appear to change significantly indicating lack of droplet coalescence. The zeta potential values were all above 25mV. Below this value emulsions reflect a state of instability and droplet coalescence. The multiple emulsions can be said to be remarkably stable for the period of study.