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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Interfacial and Thermodynamic Properties of SDBS-C_(12)E_(10) Mixed Micelles in Aqueous Media: Effect of Additives
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Interfacial and Thermodynamic Properties of SDBS-C_(12)E_(10) Mixed Micelles in Aqueous Media: Effect of Additives

机译：水性介质中SDBS-C_（12）E_（10）混合胶束的界面和热力学性质：添加剂的影响

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摘要

The interfacial and thermodynamic properties of SDBS/C_(12)E_(10) mixed system in aqueous solution in the presence of additives, i.e., poly(ethylene glycol) 400, sucrose, and urea have been investigated. The critical micelle concentrations (cmc) were determined by both surface tension and conductivity measurements. The maximum surface excess (Γ_(max)) and minimum area per molecule (A_(min)) were determined from surface tension data. The thermodynamic parameters of micellization and adsorption were computed and discussed. The enthalpy-entropy compensation effect was observed in all the cosolvent systems. The partition coefficient of these hydrophilic additives between the micelle and the solvent was found to be zero. The transfer quantities, which are sensitive to the solvent structure, were also computed. The interaction parameters between the surfactant molecules both in the presence and absence of additives were evaluated by Rubingh's approach. Micellar aggregation number (N_(agg)) for the mixed system in the presence and absence of additives were determined by fluorescence measurements. ~1H NMR was also used to study the behavior of surfactants in mixed micelles.
机译：研究了SDBS / C_（12）E_（10）混合体系在添加剂（即聚（乙二醇）400，蔗糖和尿素）存在下在水溶液中的界面和热力学性质。通过表面张力和电导率测量来确定临界胶束浓度（cmc）。根据表面张力数据确定最大表面过量（Γ_（max））和每个分子的最小面积（A_（min））。计算并讨论了胶束化和吸附的热力学参数。在所有助溶剂体系中均观察到了焓-熵补偿作用。发现这些亲水性添加剂在胶束和溶剂之间的分配系数为零。还计算了对溶剂结构敏感的转移量。在表面活性剂分子的存在和不存在的情况下，表面活性剂分子之间的相互作用参数通过Rubingh方法进行评估。在存在和不存在添加剂的情况下，混合体系的胶束聚集数（N_（agg））通过荧光测量确定。 〜1H NMR也用于研究混合胶束中表面活性剂的行为。

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