Li X, Kunieda H
Graduate School of Engineering, Yokohama National University, Tokiwadai 79-5, Hodogaya-ku, Yokohama, 240-8501, Japan
J Colloid Interface Sci. 2000 Nov 1;231(1):143-151. doi: 10.1006/jcis.2000.7128.
The formation and microstructure of cubic phases were investigated in anionic and cationic surfactant-containing systems at 25 degrees C. In the system sodium dodecyl sulfate(SDS)-dodecyltrimethylammonium bromide(DTAB)-water, mixing of two surfactants shows the phase transition hexagonal phase (H(1))-->surfactant precipitate, accompanied by an obvious decrease in the cross-sectional area per surfactant in the rod micelles of the hexagonal liquid crystal. In the mixed systems brine(A)-dodecane(B)-SDS(C)-DTAB(D)-hexanol(E), the isotropic discontinuous cubic phase is formed from the H(1) phase at a low cationic surfactant weight fraction, Y=D/(C+D), and from the lamellar phase at high Y upon dilution with equal amounts of oil and brine, respectively. The minimum surfactant concentration to form the cubic phase decreases with increases both in cationic surfactant weight fraction Y from 0 to 0.30 and in hexanol weight fraction, W(1)=E/(C+D+E), accordingly. The maximum solubilization for oil of the cubic phase reaches 43 wt% at 14 wt% of mixed surfactants and alcohol. Copyright 2000 Academic Press.
在25℃下，研究了含阴离子和阳离子表面活性剂体系中立方相的形成和微观结构。在十二烷基硫酸钠（SDS）-十二烷基三甲基溴化铵（DTAB）-水体系中，两种表面活性剂的混合显示出相转变：六方相（H(1)）→表面活性剂沉淀，同时六方液晶棒状胶束中每个表面活性剂的横截面积明显减小。在混合体系盐水（A）-十二烷（B）-SDS（C）-DTAB（D）-己醇（E）中，在低阳离子表面活性剂重量分数Y = D/(C + D)时，由H(1)相形成各向同性不连续立方相；在高Y时，分别通过用等量的油和盐水稀释，由层状相形成立方相。形成立方相的最低表面活性剂浓度随着阳离子表面活性剂重量分数Y从0增加到0.30以及己醇重量分数W(1)=E/(C + D + E)的增加而相应降低。在混合表面活性剂和醇含量为14 wt%时，立方相对油的最大增溶量达到43 wt%。版权所有2000年学术出版社。
