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首页> 外文期刊>Applied Magnetic Resonance >Self-Diffusion of Ionic Surfactants and Counterions in Premicellar and Micellar Solutions of Sodium, Lithium and Cesium Dodecyl Sulfates as Studied by NMR-Diffusometry
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Self-Diffusion of Ionic Surfactants and Counterions in Premicellar and Micellar Solutions of Sodium, Lithium and Cesium Dodecyl Sulfates as Studied by NMR-Diffusometry

机译：核磁共振扩散法研究离子表面活性剂和抗衡离子在十二烷基硫酸钠和十二烷基硫酸钠的胶束和胶束溶液中的自扩散

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摘要

Self-diffusion of surfactants and counterions in premicellar and micellar solutions of sodium, lithium and cesium dodecyl sulfates has been examined by nuclear magnetic resonance (NMR)-diffusometry. Self-diffusion of surfactants obeys as a whole the well-known two-site exchange model in which surfactants diffuse as micelles and non-micellized molecules in monomer and dimer forms. To explain self-diffusion of counterions, the model which takes into account their diffusive motion about the surface of micelles is proposed. It is shown that this phenomenon contributes considerably to charge transfer in micellar solutions. Estimation of surface diffusion of counterions about the micellar surface is made on the basis of experimental results on self-diffusion of surfactants and counterions, the data obtained on critical micelle concentration and the degree of counterion binding.
机译：表面活性剂和抗衡离子在十二烷基硫酸钠，十二烷基磺酸铯和铯的胶束和胶束溶液中的自扩散已通过核磁共振（NMR）扩散法进行了研究。表面活性剂的自扩散总体上遵循众所周知的两点交换模型，在该模型中，表面活性剂以胶束和非胶束化分子的形式以单体和二聚体形式扩散。为了解释抗衡离子的自我扩散，提出了考虑它们在胶束表面扩散运动的模型。结果表明，这种现象大大促进了胶束溶液中的电荷转移。根据表面活性剂和抗衡离子自扩散的实验结果，有关临界胶束浓度和抗衡离子结合程度的数据，估算抗衡离子在胶束表面的表面扩散。

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