Ultrasonic relaxation and electrochemical measurements on monomer/micelle exchange in dodecylpyridinium bromide solutions containing added sodium bromide
Ultrasonic relaxation and electrochemical measurements on monomer/micelle exchange in dodecylpyridinium bromide solutions containing added sodium bromide
复制标题
添加溴化钠的十二烷基溴化吡啶溶液中单体/胶束交换的超声弛豫和电化学测量
DOI：
10.1021/j100170a048
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发表时间：
1991
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;R. Palepu;D. Bloor;D. Hall;E. Wyn
在10{sup {minus}4}和10{sup {minus}1} mol dm{sup {minus}3}溴化钠（NaBr）存在下，测定了与扰动十二烷基溴化吡啶（DPBr）中单体/胶束平衡有关的超声弛豫。测定了十二烷基吡啶阳离子表面活性剂膜电极相对于溴离子、钠离子和液接电极的电动势，并对胶束范围内DP{sup +}的单体浓度和胶束解离的有效程度进行了评价。结合的动态和平衡数据已被用来调查的单体/胶束交换过程的动力学，通过使用不同的版本和修改的所谓的快速松弛时间方程的Aniansson和墙，也是一种替代方法来调查动力学-一种唯象处理。这些方法来获得新的胶束参数的范围和局限性进行了讨论。从浓度依赖性的超声波弛豫的振幅的体积变化与单体/胶束平衡已估计。此外，进行密度测量和光散射测量。
The ultrasonic relaxations associated with the perturbation of the monomer/micelle equilibrium in dodecylpyridinium bromide (DPBr) have been measured in the presence of 10{sup {minus}4} and 10{sup {minus}1} mol dm{sup {minus}3} sodium bromide (NaBr). The emf of a specially constructed dodecylpyridinium cationic surfactant membrane electrode relative to, successively, a bromide ion, sodium ion, and also a liquid junction electrode has been measured, and the monomer concentration of DP{sup +} in the micellar range and the effective degree of micellar dissociation have been evaluated. The combined dynamic and equilibrium data have been used to investigate the kinetics of the monomer/micelle exchange process by using different versions and modifications of the so-called fast relaxation time equation of Aniansson and Wall and also an alternative approach to investigate kinetics - a phenomenological treatment. The scope and limitations of these approaches to derive new micellar parameters are discussed. From the concentration dependence of the amplitude of the ultrasonic relaxation the volume change associated with the monomer/micelle equilibria has been estimated. In addition density measurements and light scattering measurements were taken.