Triton X-100/CTAB在乙二醇/水混合溶剂中的热力学性质和胶团化行为

Micellization Behavior and Thermodynamic Properties of Triton X-100/ CTAB Mixtures in Ethylene Glycol and Water Solvent Mixtures

利用表面张力法,研究了非离子表面活性剂Triton X-100和离子表面活性剂十六烷基三甲基溴化铵(CTAB)混合体系在混合极性溶剂乙二醇/水(乙二醇的体积分数分别为5%、10%和20%)中的热力学性质和胶团化行为.结果表明,混合体系在乙二醇水溶液中存在协同效应,临界胶束浓度随乙二醇含量的增加而增大.利用Rubingh和Maeda模型计算了混合物中各组分在胶团相中的组成、相互作用参数以及自由能的贡献.在实验研究的乙二醇浓度范围内,发现该非离子/离子混合体系在离子组分摩尔分数约为0.3时,协同效应最强.

The micellization behavior of the nonionic surfactant Triton X-100 （TX100） and the cationic cetyltrimethylammonium bromide （CTAB） binary mixtures was investigated in ethylene glycol （EG） and water mixtures using a tensiometric technique. We show that synergistic effects exist for surface tension reduction and mixed micelle formation. When the molar fraction of CTAB in the mixture is about 0.3, the synergistic effect is at its optimum. The critical micelle concentration of the mixture increases as the content of EG in the mixed solvents increases. The established theories of Rubingh and Maeda were applied to determine the molar fraction of the different components, the interaction parameters and several thermodynamic properties of the micellar phase. We found that the micelle composition and the interaction parameters from Rubingh＇s model and Maeda＇s model were in agreement.