水/非イオン界面活性剤/長鎖アルコール系の相平衡と乳化の安定性に関する研究

抄録

A three-phase region of the W+D' +Om type appeared in a water/nonionic surfactant/middle- or long-chain alcohol system, in which W was an excess water phase and Om, a nonaqueous reversed micellar solution phase. The D' phase (surfactant phase), also called an anomalous or L₃ phase, differed from the other surfactant phase, D, which was usually observed in water/nonionic surfactant/hydrocarbon systems. In many linear-chain alcohol systems, the D' phase was observed over a wide range of water/alcohol ratios, and a liquid crystal of lamellar type was present below the three-phase temperature. When branched alcohol was used, phase behavior changed and became similar to a three-phase region of the W+D+O type as in ordinary hydrocarbon systems. The solubilizing capacity of the D' phase was much larger than that of the D' phase. The appearance of D or D' phases was dependent of the nature of the alcohol and surfactant.