Fluorescence-probe study of vesicle and micelle formations in a binary cationic surfactants system

被引：26

作者：

Kodama, T ^{[1
]}

Ohta, A ^{[1
]}

Toda, K ^{[1
]}

Katada, T ^{[1
]}

Asakawa, T ^{[1
]}

Miyagishi, S ^{[1
]}

机构：

[1] Kanazawa Univ, Grad Sch Nat Sci & Technol, Div Mat Sci, Kanazawa, Ishikawa 9201192, Japan

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2006年 / 277卷 / 1-3期

关键词：

fluorescence probed; vesicle and micelle formations; vesicle to micelle transition; double-tailed and single-tailed surfactants; phase diagram; polarization;

D O I：

10.1016/j.colsurfa.2005.11.004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A phase diagram of a dodecyltrimethylammonium bromide (DTAB)-didodecyldimethylammonium bromide (DDAB) system was obtained by a combination Of two fluorescence probes, auramine and pyrene. In the DTAB-rich region, a vesicle was formed at first, and then a vesicle-micelle transition occurred at a higher concentration, near the critical micelle concentration of DTAB. On the other hand, in the region with a DDAB-rich composition, a small micelle appeared at lower concentrations, and a micelle-vesicle transition occurred at a higher concentration. It was found that the polarization was at a maximum at the DDAB-rich composition, and the addition of a small amount of DTAB to the DDAB vesicle caused the molecular packing at the vesicle membrane to tighten. However, the hydrophobic chain length of the single-tailed surfactant did not have a significant influence on the mixed vesicle membrane at a DDAB-rich composition. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：20 / 26

页数：7