García-Río L, Leis J R, López-Fontán J L, Mejuto J C, Mosquera V, Rodríguez-Dafonte P
Departamento de Química Física, Facultad de Química, Universidad de Santiago, 15782 Santiago, Spain.
J Colloid Interface Sci. 2005 Sep 15;289(2):521-9. doi: 10.1016/j.jcis.2005.03.084.
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 (Xi(m)). Mixing nonideality was expressed in terms of the molecular interaction parameter (beta12) 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 (DeltaGM) and to evaluate the synergistic phenomenon.
通过临界胶束浓度（cmc）随溶液组成的变化，确定了十六烷基三甲基氯化铵与未取代以及N - 取代的正辛胺、正癸胺和月桂胺二元混合物胶束组成中链长和头基性质的影响。在所有情况下均观察到协同效应，发现其与链长以及烷基胺头基上N - 取代基的类型相关。将实验数据与基于溶液中胶束和单体之间平衡的理论预测进行了比较。采用本村处理方法确定混合胶束中各化合物的组成（Xi(m)）。混合非理想性用基于霍兰德和鲁宾理论确定的分子相互作用参数（beta12）表示。最后，使用普瓦达和布兰克斯泰因开发的混合表面活性剂体系分子热力学模型来估算胶束化自由能（DeltaGM）并评估协同现象。
