文献类型：期刊文献

英文题名：Interactions and Aggregations in Aqueous and Brine Solutions of Poly(diallydimethylammonium chloride)/Sodium Bis(2-ethylhexyl) Sulfosuccinate

作者：Zheng, Peizhu[1];An, Xueqin[2,3];Peng, Xuhong[1];Shen, Weiguo[1,2]

机构：[1]Lanzhou Univ, Dept Chem, Lanzhou 730000, Gansu, Peoples R China;[2]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[3]Nanjing Normal Univ, Jiangsu Key Lab Biofunct Materals, Nanjing 210097, Peoples R China

年份：2009

卷号：113

期号：41

起止页码：13566

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY B

收录：;EI(收录号：20094312396594);WOS:【SCI-EXPANDED(收录号:WOS:000270460300016)】；

基金：This work is supported by the National Natural Science Foundation of China (Projects 20473035, 20603014, and 20673059), the Chinese Ministry of Education (Key project 105074), and Committee of Science and Technology of Shanghai (Projects 0652nm010 and 08jc14081).

语种：英文

外文关键词：Micellization - Chlorine compounds - Entropy - High resolution transmission electron microscopy - Solutions - Dynamic light scattering - Ion exchange - Thermoanalysis - Anionic surfactants

摘要：The interactions between the anionic surfactant sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and the polycation poly (diallydimethylammonium chloride) (PDDAC), the aggregations of AOT and PDDAC-bound AOT in PDDAC/AOT aqueous solutions, and the influence of salt on the interactions and aggregations have been studied by isothermal titration calorimetry (ITC), dynamic light scattering (DLS), and negative staining transmission electron microscopy (TEM). The adsorptions of AOT onto PDDAC and the formations of PDDAC-bound AOT micelles, free AOT micelles, and AOT vesicles were examined, and the corresponding critical concentrations were determined. Combining calculations of thermodynamic parameters with the above three experimental techniques, it was shown that the micellization of free AOT is driven by entropy gain, while the adsorption of AOT onto PDDAC and the micellization of PDDAC-bound AOT are driven by both enthalpy and entropy. It was also found that addition of salt enhances the binding of AOT onto PDDAC through the ion exchange and favors the formations of PDDAC/AOT micelles, free ACT micelles, and free AOT vesicles but prevents the transition of PDDAC/AOT micelles to the vesicles. Thermodynamic analysis suggested that the adsorption of AOT onto PDDAC and the micellization of PDDAC/AOT in PDDAC/AOT brine solutions are different in mechanism compared with that in corresponding aqueous solutions.