Interaction of sodium ions with cationic surfactant interfaces

Date

2006

Authors

Murgia, Sergio
Portesani, Filippo
Ninham, Barry
Monduzzi, Maura

Journal Title

Journal ISSN

Volume Title

Publisher

Wiley-VCH Verlag GMBH

Abstract

The thermodynamically stable microemulsion and lamellar phases in the didodecyldimethylammonium bromide/water/n-decane ternary system were explored in the presence of NaBr to gain information on sodium ion-interface interactions. Experimental results, obtained by different NMR techniques, strongly suggest accumulation of sodium ions at the cationic interface. This apparently counterintuitive result is explained by invoking the dispersion potential experienced by the ions near the interface. A mechanism is proposed that can account for the dramatic shrinkage of the microemulsion phase region when an electrolyte is added.

Description

Keywords

Keywords: Dispersions; Interfaces (materials); Nuclear magnetic resonance spectroscopy; Phase transitions; Surface active agents; Ternary systems; Cationic interfaces; Microemulsion phase; Sodium Interfaces; NMR spectroscopy; Phase transitions; Sodium; Surfactants

Citation

Source

Chemistry, A European Journal

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1002/chem.200600080

Restricted until

2037-12-31