Two systems: (a) a costabilized system of toluene/water/1‐propanol, and (b) an emulsion system of toluene/sodium dodecyl sulfate/1‐butanol/NaCl solution are used as examples to provide some general observations on emulsion formation and stability. Phase volume and interfacial tension measurements indicate that the requirement for formation of O/W systems is low γ i , but for overall stability, γ i must be positive and of significant value in addition to any steric barrier at the interface. An approximate calculation of the amount of surfactant needed to fill the interface provides a guide for preparation of such systems.
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Rosano et al. (1982) studied this question.
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