Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
220860 | Journal of Electroanalytical Chemistry | 2007 | 6 Pages |
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.
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Physical Sciences and Engineering
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Authors
Tiago Luiz Ferreira, Omar A. El Seoud, Mauro Bertotti,