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- W1978952016 abstract "Three-dimensional phase diagram of the water 2% NaCl, dodecane, pentanol-sodium octylbenzenesulfonate system has been investigated. Topology of the three-phase Winsor III volume has been studied in detail. Brine can be considered as a pseudocomponent, therefore three-phase states are univariant at P and T constant. The representative points of compositions of aqueous, microemulsion, and organic phases are located respectively on three curves Γ1, Γ2, Γ3, which have been characterized. Γ1 and Γ2 on the one hand and Γ2 and Γ3 on the other hand are converging; they form a single curve. This implies that the three-phase volume of the studied system presents two critical end points K1,2 and K2,3 where the microemulsion phase becomes respectively identical to the aqueous and the organic phases. γmo, γmw, and γwo interfacial tensions vary all along the Γ2 curve. Correlations between γmo, γmw, and γwo values and the water content in the middle phase have been established. The lowest values are obtained in the vicinity of critical end points; in the intermediate part of the Γ2 curve far from both critical end points, the tensions are still low. Application of scaling law theory shows that two mechanisms are operative in the achievement of low interfacial tensions in microemulsion systems. In three-phase states γmo and the lowest γmw interfacial tensions are associated with critical phenomena and thick interfaces; in two-phase regions, these tensions are probably due to a thin interface of alcohol and surfactant molecules. Light scattering experiments show that only microemulsion middle phases located either in the water-rich (χH2Om > 70%) or the oil-rich (χH2Om < 25%) parts of the Γ2 curve give rise to light scattering characteristic of critical states." @default.
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- W1978952016 date "1982-10-01" @default.
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- W1978952016 title "Thermodynamic, interfacial, and structural properties of polyphasic microemulsion systems" @default.
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- W1978952016 doi "https://doi.org/10.1016/0021-9797(82)90194-1" @default.
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