ABSTRACT
Emulsions have been described as heterogeneous systems of one immiscible liquid dispersed in another, in the form of droplets that have thermodynamic instability. In addition, double emulsions can be prepared by forming water-oil emulsion with a large excess of relatively hydrophobic emulsifier and a small amount of hydrophilic emulsifier followed by heat-treating the emulsion until, at least in part, it will invert. The composition of the multiple emulsion is of significant importance, since the different surfactants along with the nature and concentration of the oil phase will affect the stability of the double emulsion. The transport will be dependent on the nature of the entrapped material, the oil, as well as on the pH of the aqueous phase. However, the monomeric emulsifiers covering the outer interface do not prevent the coalescence of the outer droplets in the double emulsions.
