Adsorption and coalescence in mixed surfactant systems: Water−hydrocarbon interface
Adsorption and coalescence in mixed surfactant systems: Water−hydrocarbon interface
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DOI：
10.1016/j.ces.2010.04.036
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发表时间：
2010-07
影响因子：
4.7
通讯作者：
S. M. Reddy;P. Ghosh
中科院分区：
文献类型：
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作者：
S. M. Reddy;P. Ghosh
表面活性剂的主要商业用途涉及这些化合物的混合物。在水-烃界面处形成的单分子层的性质取决于表面活性剂分子之间的相互作用。盐的存在影响了单分子层和胶束中表面活性剂之间的相互作用。在这项工作中，这些相互作用的存在和不存在的1：1的盐进行了研究，并使用非理想溶液理论的结果进行了分析。使用阴离子、阳离子和非离子表面活性剂。乳化液的稳定性受表面活性剂之间相互作用的影响。为了研究这种效应，在混合表面活性剂体系中研究了环己烷液滴在平坦的水-环己烷界面处的聚结，并将结果与单一表面活性剂体系进行了比较。研究了盐对聚结时间的影响。利用膜排水和随机聚结理论对试验结果进行了分析。采用7种膜排水模型对聚结时间进行了预测，并将预测值与实验值进行了比较。根据系统的特性，分析了随机模型的参数。
Major commercial uses of surfactants involve a mixture of these compounds. The properties of the monolayer formed at the water−hydrocarbon interface depend upon the interaction between the surfactant molecules. The presence of salt influences the interactions between the surfactants in the monolayer and in the micelle. In this work, these interactions in presence and in absence of a 1:1 salt were studied and the results were analyzed using the nonideal solution theory. An anionic, a cationic and a nonionic surfactant were used. The stability of emulsions is significantly affected by the interaction between the surfactants. To study this effect, coalescence of cyclohexane drops at a flat water−cyclohexane interface was studied in the mixed surfactant systems, and the results were compared with single surfactant systems. The effect of salt on coalescence time was studied. The results were analyzed using the film drainage and stochastic theories of coalescence. Seven film drainage models were used to predict the coalescence time, and the values predicted by these models were compared with the experimental data. The parameters of the stochastic model were analyzed based on the properties of the systems.