The Isotropic Oil-Surfactant-Rich Phase in Systems of Aromatic Oils, Nonionic Surfactants, and Water
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文摘
The different structures in the isotropic oil-surfactant-rich phase composed of aromatic oils, nonionic surfactants, and water have been elucidated by means of conductivity, viscosity, and light-scattering measurements at 298.2 K. The oils used are benzene and 1,3,5-trimethylbenzene and the surfactants used are commercial nonyl phenyl polyethoxylates. The oils and surfactants are completely soluble in each other. At low surfactant contents water is sparingly soluble in the oil-surfactant mixtures, indicating that aggregates solubilizing water are not formed. As water is added to mixtures of intermediate mass fractions of oil and surfactant, closed aggregates solubilizing water are formed. At high surfactant contents, open structures are formed and the solubility of water depends on the surfactant used. As the nonionic surfactants are mixed with the anionic surfactant sodium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT), closed aggregates solubilizing water are also formed at low surfactant contents and the open structures are still present at high surfactant contents.