The aggregation in dodecyltrimethylammonium hydroxide aqueous solutions |
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| Authors: | P. C. Schulz M. A. Morini R. M. Minardi J. E. Puig |
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| Affiliation: | (1) Department of Chemistry and Chemical Engineering, Universidad Nacional del Sur, 8000 Bahia Blanca, Argentina;(2) Faculty of Chemical Sciences, Universidad de Guadalajara, Guadalajara, Mexico |
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| Abstract: | The aggregation of dodecyltrimethylammonium hydroxide (DTAOH) aqueous solutions has been studied by several methods. It is stepwise and four critical points were found. AtCT=(2.51±0.10)×10–4 mol · dm–3 the surface excess becomes zero, atCT=(1.300±0.041)×10–3 mol · dm–3 small aggregates from, which grow with concentration. AtCT=(1.108±0.010)×10–2 mol · dm–3 true micelles form (CMC) and at (3.02±0.28)×10–2 mol · dm–3 the structure of micelles probably changes affecting their properties. The DTAOH micelles are highly ionized ( =0.8) at the CMC, and decreases to reach very small values when the total concentration increases. |
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| Keywords: | Hydroxide surfactants critical micelle concentration aggregation cationic surfactants micelle charge |
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