Micellization and superficial activity of N-alkyltrimethylammonium bromides in water-orthophosphoric acid medium

被引：3
|
作者：
Ouni, S [1 ]
Hafiane, A [1 ]
Dhahbi, M [1 ]
机构：
[1] Inst Natl Rech Sci & Tech, Lab Physicochim Interfaces & Mat, Hammam Lif 2050, Tunisia
来源：
JOURNAL DE CHIMIE PHYSIQUE ET DE PHYSICO-CHIMIE BIOLOGIQUE | 1998年 / 95卷 / 05期
关键词：
micellisation; superficial tension; surfactant; orthophosphoric acid;
D O I：
10.1051/jcp:1998221
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Measurements of superficial tension of n-alkyltrimethylammonium bromides in air/water-orthophosphoric acid interface have been made by "stripping method". Data were evaluated by approximation to the Von Szyszkowski equation. Thermodynamic parameters as (Gamma(max), F, A, B, Delta G(A) degrees, Delta G(M) and CMC) at different concentrations of orhophosphoric acid (0 at 3 M) are calculated. The CMC values of the homologous series in relation to the chain length were determined. They showed a good correlation with the Klevens equation. A minimum of CMC and (-Delta G(M)) was observed for the n-octadecyltrimethylammonium bromide, which has been attributed to the cosolvant effect and the change of medium properties.
引用
收藏
页码：911 / 926
页数：16
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