Interaction of sodium ions with cationic surfactant interfaces

Sergio Murgia; Filippo Portesani; Barry W. Ninham; Maura Monduzzi

doi:10.1002/chem.200600080

Interaction of sodium ions with cationic surfactant interfaces

Sergio Murgia, Filippo Portesani, Barry W. Ninham, Maura Monduzzi^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

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.

Original language	English
Pages (from-to)	7889-7898
Number of pages	10
Journal	Chemistry - A European Journal
Volume	12
Issue number	30
DOIs	https://doi.org/10.1002/chem.200600080
Publication status	Published - 16 Oct 2006

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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.",

keywords = "Interfaces, NMR spectroscopy, Phase transitions, Sodium, Surfactants",

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AU - Murgia, Sergio

AU - Portesani, Filippo

AU - Ninham, Barry W.

AU - Monduzzi, Maura

PY - 2006/10/16

Y1 - 2006/10/16

N2 - 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.

AB - 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.

KW - Interfaces

KW - NMR spectroscopy

KW - Phase transitions

KW - Sodium

KW - Surfactants

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JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

IS - 30

ER -

Interaction of sodium ions with cationic surfactant interfaces

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