Abstract
Molecular interactions between oil soluble and water soluble components were studied by measurement of interfacial tension of oil/water interface.The water soluble component, such as sodium dodecyl sulfate interacted with oil soluble components in the following order : cholesterol>lauryl and octadecyl alcohols>oleyol alcohol. The cholesterol-sodium dodecyl sulfate system led spontaneous emulsification into the oil phase, while the lauryl alcohol-sodium dodecyl sulfate system led into the water phase.With the water soluble surfactants having different polar group, the oil soluble cholesterol component interacted in the following order : sodium dodecyl sulfate>sodium laurate>sodium dodecylbenzene sulfonate. In these systems spontaneous emulsification was observed at interfacial tension about 2 dynes/cm except sodium dodecylbenzene sulfonate. In addition, from the rate of penetration of surfactants into the interface, the reactivities to cholesterol were similar to above results and it was found that sodium dodecylbenzene sulfonate takes an appreciable period of time to penetrate into the interface.
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