Experimental and thermodynamic analysis of mixed micelles formed by dodecylethylmethacrylatedimethylammonium bromide and tetradecyltrimethylammonium bromide
- Pereyra, Romina Belén
- Fernández Leyes, Marcos Daniel
- Silbestri, Gustavo Fabián
- Durand, Guillermo Andrés
- Schulz, Pablo Carlos
- Ritacco, Hernán Alejandro
- Schulz, Erica Patricia
DOIAbstract
The micellization process of a surfactant system formed by the mixture of two cationic surfactants, a conventional one, tetradecyltrimethylammonium bromide (TTAB), and a polymerizable surfactant, methylammonium dodecylethylmethacrylate (PS) bromide, was studied, using a battery of methods such as conductivity, ion selective electrodes and UV?vis spectroscopy. Critical micelles concentrations (CMCs) were obtained using traditional methods and two newer procedures proposed by Carpena and Al-Soufi. The critical micelle concentrations (CMC) of the mixtures were higher than ideal, suggesting that there is repulsion between the two components in the mixing process. We applied four thermodynamic models: Rubingh?Holland, Motomura, Letellier, and EO...
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