文献类型：期刊文献

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

作者：Du, Changfei[1];Cai, Dongxing[2];Qin, Miao[1];Zheng, Peizhu[2];Hao, Zhiguo[2];Yin, Tianxiang[1];Zhao, Jihua[2];Shen, Weiguo[1,2]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Lanzhou Univ, Dept Chem, Lanzhou 730000, Gansu, Peoples R China

年份：2014

卷号：118

期号：4

起止页码：1168

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY B

收录：;EI(收录号：20140617290295);WOS:【SCI-EXPANDED(收录号:WOS:000330610400033)】；

基金：This work was supported by the National Natural Science Foundation of China (Projects 20973061, 21173080, 21373085, and 21303055).

语种：英文

外文关键词：Solutions - Surface active agents - Thermodynamics - Phase transitions - Ionic liquids - Micelles - Micellization

摘要：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'-bis(dimethyldodecyl)-1,2-ethanediammoniumdibromide (12-2-12) with the imidazolium ionic liquid 1-dodecyl-3-methylimidazolium bromide (C(12)mimBr) 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 12-2-12/C(12)mimBr 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.