Effects of KBr and n-decanol on the properties of cetyltrimethylammonium bromide micelles in aqueous solutions: A microelectrode voltammetric study

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Abstract

A platinum disc microelectrode was employed to measure the diffusion coefficient of cetyltrimethylammonium bromide, CTABr, aggregates in aqueous solution and in the presence of additives: KBr, n-decanol, and KBr + n-decanol. Other micellar parameters such as the hydrodynamic radii and aggregation numbers were calculated from the micellar diffusion coefficients. The data obtained were rationalized in terms of electrolyte-induced aggregate size increase and sphere-to-rod morphology change. In the presence of solubilized n-decanol, this transition occurred at a lower KBr concentration, confirming that the micelle surface charge density, hence its dimension, is strongly influenced by adsorption of the fatty alcohol. © 2007 Elsevier B.V. All rights reserved.

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Luiz Ferreira, T., El Seoud, O. A., & Bertotti, M. (2007). Effects of KBr and n-decanol on the properties of cetyltrimethylammonium bromide micelles in aqueous solutions: A microelectrode voltammetric study. Journal of Electroanalytical Chemistry, 603(2), 275–280. https://doi.org/10.1016/j.jelechem.2007.02.016

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