Ultrasonic Relaxation and Electrochemical Measurements of the Micellization of Sodium Dodecyl Sulfate and Sodium Dihexylsulfosuccinate
Ultrasonic Relaxation and Electrochemical Measurements of the Micellization of Sodium Dodecyl Sulfate and Sodium Dihexylsulfosuccinate
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十二烷基硫酸钠和二己基磺基琥珀酸钠胶束化的超声弛豫和电化学测量
DOI：
10.1006/jcis.1995.1056
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
E. Wyn
中科院分区：
文献类型：
--
作者：
W. A. Wan;T. Lukas;D. Bloor;E. Wyn
摘要研究了10-4 (mol dm-3) NaBr存在下十二烷基硫酸钠和二己基磺基琥珀酸钠中单体/胶束交换过程的超声弛豫。构建了对这两种表面活性剂都有选择性的膜电极，并测量了它们相对于商用溴化物和钠电极的电动势。根据这些电磁场数据，测量了两种表面活性剂在胶束范围内的单体浓度和胶束解离的程度。与单体胶束交换过程相关的动力学参数和胶束的多分散性已经用最初由Aniansson和Wall导出的松弛方程的不同版本进行了评估，并使用了现象学处理。最后，从弛豫振幅的浓度依赖性出发，评价了胶束化过程中的体积变化和胶束的多分散性。
Abstract The ultrasonic relaxation associated with the perturbation of the monomer/micelle exchange process in sodium dodecyl sulfate and sodium dihexylsulfosuccinate in the presence of 10-4 (mol dm-3) NaBr has been studied. Membrane electrodes selective to both surfactants were constructed and their emf measured relative to both a commercial bromide and a sodium electrode. From these emf data the monomer concentrations of both surfactants in the micellar range and also the degree of micellar dissociation were measured. The kinetic parameters associated with the monomer micelle exchange process and the polydispersity of the micelles have been evaluated using different versions of the relaxation equation originally derived by Aniansson and Wall and also using a phenomenological treatment. Finally, the volume change during micellization and the polydispersity of the micelles were evaluated from the concentration dependence of the relaxation amplitude.