Mixed micellization of anionic¨Cnonionic surfactants in aqueous media: a physicochemical study with theoretical consideration

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• 作者：Chanchal Das ; Tanushree Chakraborty ; Soumen Ghosh and Bijan Das
• 关键词：Mixed micelle ; Critical micellar concentration ; Theoretical model
• 刊名：Colloid & Polymer Science
• 出版年：2008
• 出版时间：September, 2008
• 年：2008
• 卷：286
• 期：10
• 页码：1143-1155
• 全文大小：252.7 KB

文摘

Mixed micellization of binary and ternary mixtures of anionic and nonionic surfactants, such as lithium dodecyl sulfate, polyoxyethylene(23)laurylether, and polyoxyethylene-tert-octylphenylether, is studied in aqueous solution using tensiometric, conductometric, and spectrophotometric methods. Although tensiometry and conductometry complement each other closely, the spectroscopic critical micellar concentration (cmc) is far from agreement with tensiometric study. Several parameters, e.g., cmc, degree of counterion binding, free energies of micellization, and interfacial adsorption, have been evaluated. Established theories of Clint, Rosen, Rubingh, Motomura, Georgiev, Maeda, and Blankschtein were applied to evaluate the mole fraction of different components in the self-aggregated phase, the interaction parameter, free energy contributions, and expected cmc.