Characterization of micellar solutions using surfactant ion electrodes

Kalidas M. Kale, E. L. Cussler, D. F. Evans

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161 Scopus citations


Surfactant ion electrodes were used to investigate the dimerization, aggregation, and micelle formation occurring at 25 °C in aqueous solutions of sodium dodecyl sulfate, decyltrimethylammonium bromide, tetradecyltrimethylammonium bromide (TTAB), and orange II (4-[(2-hydroxy-l-naphthalenyl)azo]benzenesulfonic acid monosodium salt) as a function of added electrolyte. The surfactant electrodes, which contained a liquid membrane ion exchanger, permitted a direct determination of the surfactant monomer activity. Analysis of these data gave an association constant of 1000 for orange II, an estimated fractional charge on the DTAB micelle of 0.78, a dimerization constant of 400 (L/M) for TTAB, and a second break above the commonly accepted critical micelle concentration for sodium dodecyl sulfate, a break which may result from an ordering of the micelles.

Original languageEnglish (US)
Pages (from-to)593-598
Number of pages6
JournalThe Journal of Physical Chemistry
Issue number6
StatePublished - Jan 1 1980
Externally publishedYes


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