Yunomiya Y, Kunitake T, Tanaka T, Sugihara G, Nakashima T
Department of Chemistry, Faculty of Science, Fukuoka University, Jonan-ku, Fukuoka, 814-0180, Japan
J Colloid Interface Sci. 1998 Dec 1;208(1):1-5. doi: 10.1006/jcis.1998.5772.
Micelle formation was studied for mixed surfactant systems of a nonionic surfactant, nonanoyl-N-methylglucamine (MEGA-10) with a bile salt, sodium deoxycholate (NaDC), in water at 30 degreesC. NaDC and MEGA-10 are quite different from each other in terms not only of hydrophobic but also of hydrophilic groups. Surface tension of the aqueous solution (gamma) at different mixing ratios was measured by the drop volume method, and critical micellization concentrations (CMCs) were determined from the gamma vs CMC curves at discrete mole fractions of MEGA-10 (XMEGA) in the surfactant mixture. The CMC-XMEGA curve showed a positive deviation from ideal mixing. The apparent interaction parameter (WR) upon micelle formation was evaluated by applying the Rubingh equations derived on the basis of the regular solution theory. The different theory developed by Motomura et al. has been also applied. The analysis of CMC data indicated that the properties of mixed micelles are different between the ranges below and above XMEGA congruent with 0.2 where an azeotrope exists and that the composition of mixed micelles is very similar to that of monomeric species in bulk solution. Copyright 1998 Academic Press.
在30℃的水中，研究了非离子表面活性剂壬酰-N-甲基葡糖胺（MEGA-10）与胆盐脱氧胆酸钠（NaDC）的混合表面活性剂体系的胶束形成。NaDC和MEGA-10不仅在疏水基团方面，而且在亲水基团方面都有很大差异。通过滴体积法测量不同混合比例下水溶液的表面张力（γ），并根据表面活性剂混合物中MEGA-10（XMEGA）的离散摩尔分数下的γ对CMC曲线确定临界胶束浓度（CMC）。CMC-XMEGA曲线显示出与理想混合的正偏差。通过应用基于正规溶液理论推导的鲁宾方程来评估胶束形成时的表观相互作用参数（WR）。也应用了本村等人提出的不同理论。对CMC数据的分析表明，在XMEGA等于0.2（存在共沸物）以下和以上的范围内，混合胶束的性质不同，并且混合胶束的组成与本体溶液中单体物种的组成非常相似。版权所有1998年学术出版社。
