Abstract

Phase behavior in a NaCl/water/sodium octyl sulfonate (R 8SO 3Na)/hexanol/isooctane system was systematically investigated at constant pressure. Three-phase body containing water, surfactant (middle-phase microemulsion, D), and oil phases appears at a tricritical point at higher temperatures, whereas it appears via a four-phase region at lower temperatures. The four-phase body is formed by overlapping the three-phase body and another three-phase body including another surfactant phase (D′). We have investigated how the tricritical point or the four-phase body is produced from systems of fewer components. The effects of temperature and other variables on the tricritical point and the four-phase body are discussed. A possible explanation for the origin of the three-phase body (the existence of a tricritical endpoint) is given.

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