Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10377830 | Journal of Colloid and Interface Science | 2005 | 9 Pages |
Abstract
The influence of chain length and the nature of the head group on the composition of micelles of a binary mixture of cetyltrimethylammonium chloride with both unsubstituted and N-substituted n-octyl, n-decyl, and n-lauryl amines was established from the variation of the critical micelle concentration (cmc) as a function of the solution composition. A synergistic effect was observed in all instances that were found to be correlated with chain length and the type of N-substituent on the alkylamine head group. Experimental data were compared with theoretical predictions based on the equilibrium between micelles and monomers in solution. The Motomura treatment was used to determine the composition of each compound in the mixed micelles (X¯im). Mixing nonideality was expressed in terms of the molecular interaction parameter (β12) as determined using the theory of Holland and Rubingh. Finally, the molecular thermodynamic model for mixed surfactant systems developed by Puvvada and Blankschtein was used to estimate the micellization free energy (ÎGM) and to evaluate the synergistic phenomenon.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
L. GarcÃa-RÃo, J.R. Leis, J.L. López-Fontán, J.C. Mejuto, V. Mosquera, P. RodrÃguez-Dafonte,