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 journalArticlepeer-review

    12 Citations (Scopus)


    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 languageEnglish
    Pages (from-to)7889-7898
    Number of pages10
    JournalChemistry - A European Journal
    Issue number30
    Publication statusPublished - 16 Oct 2006


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