Effect of counterion geometry on cationic micelles

The critical micelle concentration, aggregation number, and binding properties of decyltrimethylammonium ion micelles are determined as a function of counterion geometry using the dianions of phthalic, isophthalic, and terephthalic acids. Light-scattering methods were used to secure the CMC and AN d...

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Bibliographic Details
Published inJournal of colloid and interface science Vol. 90; no. 2; pp. 546 - 548
Main Authors Menger, F.M, Williams, D.Y, Underwood, A.L, Anacker, E.W
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.01.1982
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Summary:The critical micelle concentration, aggregation number, and binding properties of decyltrimethylammonium ion micelles are determined as a function of counterion geometry using the dianions of phthalic, isophthalic, and terephthalic acids. Light-scattering methods were used to secure the CMC and AN data whereas binding data were obtained with a specific ion electrode. It is shown that the differences among the micellar parameters are quite small relative to counterion effects induced by variations in polarizability and hydrophobicity. The data are used as evidence for a disorganized micelle surface containing water-filled grooves and fatty patches which do not discriminate among various geometric dispositions of the carboxylates about the aromatic ring.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(82)90322-8