Bending elasticities of di-chained surfactant films in microemulsions

被引：1

作者：

Eastoe, J

Sharpe, D

Heenan, RK

机构：

[1] School of Chemistry, University of Bristol

[2] ISIS Facility, Rutherford Appleton Laboratory

来源：

TRENDS IN COLLOID AND INTERFACE SCIENCE XI | 1997年 / 105卷

关键词：

microemulsions; film bending elasticity; cationic surfactants; interfacial tension; SANS;

D O I：

10.1007/BF01188975

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Films, consisting of n-alkyldodecyldimethylammonium bromide surfactants (n = 12, 14, 16 or 18) in Winsor II microemulsions have been studied using small-angle neutron scattering (SANS) and surface light scattering (SLS). The combined information obtained from these experiments allows the elastic moduli (2K + Kbar) to be obtained (K is the normal and Kbar the Gaussian modulus). The values of (2K + Kbar) increased in the range 1.0-2.5 k(B) T with either the surfactant chain length and/or concentration of added NaBr electrolyte. For salt-free systems a scaling relationship was observed with film thickness t, (2K + Kbar) similar to t(2.3). Using the approach of Mitchell and Ninham (Langmuir, 1989, 5, 1121), the separate electrostatic (2K + Kbar)(elec) and surfactant contributions (2K + Kbar)(surf) have been estimated, This work is the first systematic study of rigidities for di-chain cationic surfactants, and shows that the film bending elasticity model is a good description of these microemulsions.

引用

页码：340 / 345

页数：6

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