Micellization and interfacial behavior of binary and ternary mixtures of model cationic and nonionic surfactants in aqueous NaCl medium
Micellization and interfacial behavior of binary and ternary mixtures of model cationic and nonionic surfactants in aqueous NaCl medium
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DOI：
10.1016/j.jcis.2008.03.022
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发表时间：
2008-06-15
影响因子：
9.9
通讯作者：
Das, Akhil Ranjan
中科院分区：
文献类型：
--
作者：
Dar, Aijaz Ahmad;Rather, Ghulam Mohammad;Das, Akhil Ranjan
用张力法和荧光法研究了十六烷基三甲基溴化铵(C16Br)、十六烷基苄基二甲基氯化铵(C(16)BZCl)和聚氧乙烯(20)十六烷基醚(Brij58)在25℃、30 mM氯化钠溶液中的混合胶束形成和界面性质。用Clint、Rosen、Rubingh、Blankschtein等人、Rubingh-Holland和Maeda等人的理论方法估算了胶束的组成、活度系数、相互作用参数和胶束化自由能等胶束和吸附特征。对所选择的阳离子-阳离子-非离子表面活性剂混合物在恒离子强度下的性能进行了比较，并对这些模型进行了全面的介绍。Blankschtein模型预测的协同效应低于Rubingh的方法，因为它忽略了不同大小和电荷的表面活性剂头基之间的空间相互作用所产生的贡献。用Rubingh模型中的相互作用参数和胶束摩尔分数作为输入的前田方法计算的胶束化自由能与常用的相分离模型计算的胶束化自由能有很好的相关性。本研究还表明，改进的Rubingh-Holland方法和Rosen模型可以较好地应用于分析三元表面活性剂混合物的界面特性，从而拓宽了该模型的适用范围。(C)2008年，爱思唯尔公司出版。
Mixed micelle formation and interfacial properties of aqueous binary and ternary combinations of hexadecyltrimethylammonium bromide (C16Br), hexadecylbenzyldimethylammonium chloride (C(16)BzCl) and polyoxyethylene (20) cetyl ether (Brij58) at 25 degrees C in 30 mM aqueous NaCl have been studied in detail employing tensiometric and fluorimetric techniques. The micellar and adsorption characteristics like composition, activity coefficients, mutual interaction parameters and free energy of micellization have been estimated using the theoretical approaches of Clint, Rosen, Rubingh, Blankschtein et al., Rubingh-Holland and Maeda. A comprehensive account of the comparative performance of these models on the selected cationic-cationic-nonionic surfactant mixtures at constant ionic strength has been presented. The Blankschtein model predicted lower synergism than from Rubingh's method because it neglects the contribution due to steric interaction between surfactant head groups of different sizes and charges. Free energy of micellization calculated using Maeda's approach, which employs interaction parameter and micellar mole fraction from Rubingh's model as inputs, shows good correlation with that calculated from commonly used phase separation model. The present study also reveals that the modified Rubingh-Holland method along with the Rosen's model can be applied to analyze the interfacial characteristics of ternary surfactant mixtures with a fair degree of success thereby widening the domain of applicability of this model. (C) 2008 Published by Elsevier Inc.