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Pseudo-ternary phase diagram consisting of oleic acid, the mixture of surfactant (SPC/cremophor RH-40, 1 : 2), and PEG400 with surfactant/cosurfactant ratios of (a) 1 : 1, (b) 3 : 2, (c) 2 : 1, and (d) 3 : 1. The blank region represents oil/water microemulsion formation area.
