THE AGGREGATION IN DODECYLTRIMETHYLAMMONIUM HYDROXIDE AQUEOUS-SOLUTIONS

被引：25
|
作者：
SCHULZ, PC [1 ]
MORINI, MA [1 ]
MINARDI, RM [1 ]
PUIG, JE [1 ]
机构：
[1] UNIV GUADALAJARA,FAC CHEM SCI,GUADALAJARA,MEXICO
来源：
COLLOID AND POLYMER SCIENCE | 1995年 / 273卷 / 10期
关键词：
HYDROXIDE SURFACTANTS; CRITICAL MICELLE CONCENTRATION; AGGREGATION; CATIONIC SURFACTANTS; MICELLE CHARGE;
D O I：
10.1007/BF00660374
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：
The aggregation of dodecyl trimethylammonium hydroxide (DTAOH) aqueous solutions has been studied by several methods. It is stepwise and four critical points were found. At C-T = (2.51 +/- 0.10) x 10(-4) mol . dm(-3) the surface excess becomes zero, at C-T = (1.300 +/- 0.041) x 10(-3) mol . dm(-3) small aggregates form, which grow with concentration. At C-T = (1.108 +/- 0.010) x 10(-2) mol . dm(-3) true micelles form (CMC) and at (3.02 +/- 0.28) x 10(-2) mol . dm(-3) the structure of micelles probably changes affecting their properties. The DTAOH micelles are highly ionized (alpha = 0.8) at the CMC, and decreases to reach very small values when the total concentration increases.
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页码：959 / 966
页数：8
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