Thermodynamics of Mixed Surfactant Solutions of N,N′-Bis(dimethyldodecyl)-1,2-ethanediammoniumdibromide with 1-Dodecyl-3-methylimidazolium Bromide

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• 作者：Changfei Du ; Dongxing Cai ; Miao Qin ; Peizhu Zheng ; Zhiguo Hao ; Tianxiang Yin ; Jihua Zhao ; Weiguo Shen
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：January 30, 2014
• 年：2014
• 卷：118
• 期：4
• 页码：1168-1179
• 全文大小：427K
• ISSN：1520-5207

文摘

Mixed surfactant solutions are studied to understand their synergistic effects. Here we report the micellization properties of mixed surfactant solutions of the gemini surfactant N,N鈥?bis(dimethyldodecyl)-1,2-ethanediammoniumdibromide (12鈥?鈥?2) with the imidazolium ionic liquid 1-dodecyl-3-methylimidazolium bromide (C₁₂mimBr) investigated by isothermal titration calorimetry (ITC), conductometry, fluorimetry, and dynamic light scattering (DLS). A two-parameter Margules model was successfully used to correlate the cmc values and calculate the compositions and activity coefficients of the two components in the mixed micelle phase for 12鈥?鈥?2/C₁₂mimBr aqueous solutions with different overall surfactant compositions. The dissociation degree of counterion, the thermodynamic quantities of micellization, and the excess thermodynamic quantities for the mixed micelle were calculated and discussed. The ITC experiment in the low overall surfactant composition region showed a second phase transition. A thermodynamic model was proposed to explore phase behaviors of two different types of micelle and their solution, which was further confirmed by fluorescence and DLS studies.