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The middle-phase ɛ-β fishlike phase diagrams of the pseudoquaternary microemulsion systems sodium dodecyl sulfate (sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate)/1-butanol (2-butanol, t -butanol)/ n -octane/brine (5% NaCl) were plotted. The effect of three isomeric alcohols (1-butanol, 2-butanol, and t -butanol) on the phase behavior and solubilization was investigated. From the ɛ-β fishlike phase diagram, the composition of the interfacial layer, the solubilities of alcohols and the solubilization ability (the solubility parameter SP*, and the middle-phase volume fraction ϕ) of the microemulsion systems were calculated and discussed. The alcohol content in the interfacial layer and the solubilities of alcohols are in the order: 1-butanol < 2-butanol < t -butanol, but the solubilization ability is in the inverse order.
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Zhang et al. (2010) studied this question.
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