Kunieda Hironobu, Horii Makiko, Koyama Masako, Sakamoto Kazutami
Graduate School of Engineering, Yokohama National University, Tokiwadai 79-5, Hodogaya-ku, Yokohama, 240-8501, Japan
J Colloid Interface Sci. 2001 Apr 1;236(1):78-84. doi: 10.1006/jcis.2000.7393.
The cloud temperature of 2 wt% C(12)EO(8) aqueous solutions decreases upon addition of sarcosinate-lauroyl isopropyl (SLIP), 1-dodecanol, and m-xylene, whereas it increases in glycerol tris(2-ethylhexanoic) ester (TEH), isopropyl myristate (IPM), and saturated hydrocarbon systems. A three-phase microemulsion is formed at equal weights of water and oil in the IPM system, but a lamellar liquid crystal (L(alpha)) is present in the SLIP system at the balanced temperature. The effect of added oil on the phase transition of the hexagonal (H(1)) phase was also investigated by means of SAXS study. The H(1)-L(alpha) transition occurs upon addition of SLIP or 1-dodecanol whereas the H(1)-I(1) (discontinuous micellar cubic) phase transition takes place in TEH or IPM systems. These differences in phase behavior are attributed to the placement of solubilized oil in micelles: In the former systems, oil tends to penetrate in the surfactant palisade layer and induces the surfactant layer curvature in micelles to be less positive, while the penetration tendency is small and the opposite effect on the curvature is induced upon addition of the latter oils. Copyright 2001 Academic Press.
添加肌氨酸月桂酰异丙酯（SLIP）、1-十二醇和间二甲苯后，2 wt% C(12)EO(8) 水溶液的浊点降低，而在甘油三（2-乙基己酸）酯（TEH）、肉豆蔻酸异丙酯（IPM）和饱和烃体系中浊点升高。在IPM体系中，水和油重量相等时形成三相微乳液，但在平衡温度下，SLIP体系中存在层状液晶（L(α)）。还通过小角X射线散射（SAXS）研究了添加油对六方（H(1)）相相变的影响。添加SLIP或1-十二醇时会发生H(1)-L(α)转变，而在TEH或IPM体系中会发生H(1)-I(1)（不连续胶束立方相）转变。这些相行为的差异归因于增溶油在胶束中的位置：在前一种体系中，油倾向于渗透到表面活性剂栅栏层中，并使胶束中表面活性剂层的曲率变得不那么正，而后一种油添加后，渗透倾向较小，并对曲率产生相反的影响。版权所有2001年学术出版社。
