The adsorption, micelle formation, and salting out of sodium dodecyl sulfate in the presence of sodium chloride were studied from the viewpoint of their mixed adsorption and aggregate formation. The surface tension of aqueous solutions of a sodium chloride–sodium dodecyl sulfate mixture was measured as a function of the total molality and composition of the mixture. Phase diagrams of adsorption and aggregate formation were obtained by applying thermodynamic equations to the surface tension. Judging from the phase diagrams, sodium chloride and sodium dodecyl sulfate are miscible in the adsorbed film at very large composition of sodium chloride and in the salted-out crystalline particle, while they are immiscible in the micelle. The miscibilities in the adsorbed film, micelle, and crystalline particle increase in the following order: particle > adsorbed film > micelle. The difference in miscibility among the oriented states was ascribed to the difference in geometry between the adsorbed film and micelle and to the interaction between bilayer surfaces in the particle.

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氯化钠和十二烷基硫酸钠在吸附膜和聚集体中的混溶性

从十二烷基硫酸钠的混合吸附和聚集形成的角度研究了十二烷基硫酸钠在氯化钠存在下的吸附、胶束形成和盐析。测量氯化钠 - 十二烷基硫酸钠混合物水溶液的表面张力，作为混合物总摩尔浓度和组成的函数。通过将热力学方程应用于表面张力，获得吸附和聚集体形成的相图。从相图来看，氯化钠和十二烷基硫酸钠在氯化钠含量非常大的吸附膜和盐析结晶颗粒中混溶，而在胶束中不混溶。吸附膜、胶束和结晶颗粒中的混溶性按以下顺序增加：颗粒 > 吸附膜 > 胶束。取向状态之间混溶性的差异归因于吸附膜和胶束之间几何形状的差异以及颗粒中双层表面之间的相互作用。