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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >A Study of the Interactions in a Ternary Surfactant System in Micelles and Adsorbed Layers
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A Study of the Interactions in a Ternary Surfactant System in Micelles and Adsorbed Layers

机译：胶束和吸附层中三元表面活性剂体系相互作用的研究

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Surface tension and neutron reflection measurements have been used to study the micellization and interfacial adsorption of ternary surfactant mixtures containing sodium dodecyl sulfate (SDS), n-dodecyl-N,N-dimethylaminoacetate (C↓(12)Betaine or C↓(12)B), and n-dodecyl-β-D-maltoside (C↓(12)M). Critical micelle concentrations (cmc) for the ternary mixtures are compared with values predicted using a multicomponent extension to the pseudophase separation model for nonideal mixing. Although the observed cmcs may be up to 50% different from those predicted, the errors resulting from inadequacies in the binary model mean that the results are the same within error. Values of the surface excesses at the air/solution interface at the cmc were determined directly using neutron reflection and isotopic substitution. They are found to be quite different from those predicted using the binary interaction parameters determined by surface tension. However, if the apparent binary interaction parameters obtained from directly measured compositions in the binary systems are used, the agreement between prediction and experiment is much improved. This suggests that prediction of the properties of ternary surfactant mixtures may be relatively straightforward once mixing in binary mixtures is properly characterized.
机译：表面张力和中子反射测量已用于研究含有十二烷基硫酸钠（SDS），正十二烷基-N，N-二甲基氨基乙酸（C↓（12）Betaine或C↓（12）的三元表面活性剂混合物的胶束化和界面吸附B），和正十二烷基-β-D-麦芽糖苷（C↓（12）M）。将三元混合物的临界胶束浓度（cmc）与使用非理想混合的伪相分离模型的多组分扩展预测的值进行比较。尽管观察到的cmcs可能与预测的cmcs相差50％，但是由于二元模型的不足而导致的误差意味着误差范围内的结果是相同的。使用中子反射和同位素替代直接确定cmc处的空气/溶液界面处的表面过量值。发现它们与使用由表面张力确定的二元相互作用参数预测的那些完全不同。但是，如果使用从直接测量的二元体系组成中获得的表观二元相互作用参数，则预测和实验之间的一致性将大大提高。这表明，一旦适当地表征了在二元混合物中的混合，则对三元表面活性剂混合物的性能的预测可能相对简单。

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