Thermodynamics of mixed micelles: Determination of the aggregate composition Export

@article{citeulike:3177419, abstract = {In most studies concerning surfactant mixtures, the determination of the composition of mixed micelles is often tricky. This composition can be obtained by different ways. One of them, undoubtedly the most used, supposes, a priori, that the surfactant in the micelle follows the regular solution model. This poses a problem on the thermodynamic point of view because in these studies, a model of behavior is first admitted for deducing a composition. In a correct thermodynamic approach, a composition should first be determined and then, a model of behavior which accounts for the observed physicochemical properties can be found. This approach is all the more questionable since the application of the Gibbs-Duhem relationship to the pseudo-phase allows aggregate composition to be determined simply, without using a solution model, because the composition of the bulk at the threshold of aggregation is known. In this article, we describe and validate a simple procedure, which supplements that proposed by Rodenas et al. [E. Rodenas, M. Valiente, M.D. Villafruela, J. Phys. Chem. B 103 (1999) 4549], and which allows determination of the activities of the components of the micellar aggregate and its composition. The results are compared to those obtained with other approaches such as molecular-thermodynamic model.}, author = {Letellier, Pierre and Mayaffre, Alain and Turmine, Mireille}, citeulike-article-id = {3177419}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.jcis.2008.08.010}, citeulike-linkout-1 = {http://www.sciencedirect.com/science/article/B6WHR-4T5JHX5-4/2/47b8df0b47b2c90acd05f6e094904b33}, doi = {10.1016/j.jcis.2008.08.010}, journal = {Journal of Colloid and Interface Science}, keywords = {aggregate, composition, micelles, mixed, thermodynamics}, posted-at = {2008-09-01 05:09:18}, priority = {2}, title = {Thermodynamics of mixed micelles: Determination of the aggregate composition}, url = {http://dx.doi.org/10.1016/j.jcis.2008.08.010}, volume = {In Press, Corrected Proof} }

TY - JOUR ID - citeulike:3177419 L3 - citeulike-article-id:3177419 N2 - In most studies concerning surfactant mixtures, the determination of the composition of mixed micelles is often tricky. This composition can be obtained by different ways. One of them, undoubtedly the most used, supposes, a priori, that the surfactant in the micelle follows the regular solution model. This poses a problem on the thermodynamic point of view because in these studies, a model of behavior is first admitted for deducing a composition. In a correct thermodynamic approach, a composition should first be determined and then, a model of behavior which accounts for the observed physicochemical properties can be found. This approach is all the more questionable since the application of the Gibbs-Duhem relationship to the pseudo-phase allows aggregate composition to be determined simply, without using a solution model, because the composition of the bulk at the threshold of aggregation is known. In this article, we describe and validate a simple procedure, which supplements that proposed by Rodenas et al. [E. Rodenas, M. Valiente, M.D. Villafruela, J. Phys. Chem. B 103 (1999) 4549], and which allows determination of the activities of the components of the micellar aggregate and its composition. The results are compared to those obtained with other approaches such as molecular-thermodynamic model. JF - Journal of Colloid and Interface Science TI - Thermodynamics of mixed micelles: Determination of the aggregate composition VL - In Press, Corrected Proof KW - aggregate KW - composition KW - micelles KW - mixed KW - thermodynamics AU - Letellier, Pierre AU - Mayaffre, Alain AU - Turmine, Mireille UR - http://dx.doi.org/10.1016/j.jcis.2008.08.010 ER -