Transport properties of alkyltrimethylammonium bromide surfactants in aqueous solutions

被引：62

作者：

Ribeiro, ACF ^{[1
]}

Lobo, VMM ^{[1
]}

Valente, AJM ^{[1
]}

Azevedo, EFG ^{[1
]}

Miguel, MD ^{[1
]}

Burrows, HD ^{[1
]}

机构：

[1] Univ Coimbra, Dept Chem, P-3004535 Coimbra, Portugal

来源：

COLLOID AND POLYMER SCIENCE | 2004年 / 283卷 / 03期

关键词：

diffusion; C(n)TAB; aqueous solutions; transport properties;

D O I：

10.1007/s00396-004-1136-x

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：

Differential mutual diffusion coefficients of n-alkyltrimethylammonium bromides [CH3(CH2)(n-1)N(CH3)(3)Br, C(n)TAB] (n=10, 12, 14, 16) have been measured in aqueous solutions at 298.15 K using a conductimetric cell and an automatic apparatus to follow diffusion. The cell is based on an open-ended capillary, and the technique follows the diffusion process by measuring the resistance of a solution inside the capillaries at various times. The electrical conductances of those solutions have also been measured to calculate the critical micellar concentration (cmc). Thermodynamic analysis of the data suggests that the free ion concentration decreases at concentrations above the cmc, in agreement with theoretical predictions. The obtained values of the micellization parameters were used to model the mutual diffusion coefficients of C(n)TAB aqueous solutions.

引用

页码：277 / 283

页数：7

共 32 条

[1] MEASUREMENT OF DIFFUSION-COEFFICIENTS OF ELECTROLYTES BY A MODIFIED OPEN-ENDED CAPILLARY METHOD [J].