Action of Amphiphilic Layers on the Kinetics of Interfacial Reactions at Liquid/Liquid Interfaces
Action of Amphiphilic Layers on the Kinetics of Interfacial Reactions at Liquid/Liquid Interfaces
复制标题
两亲层对液/液界面界面反应动力学的作用
作者：
W. Nitsch;M. Weigl
这一贡献涉及液相之间的化学传质，主要问题是界面上吸附的两亲层的作用。以锌离子(水相)与双硫酮(甲苯相)的络合作用为模型体系，用搅拌槽法测定了锌离子与甲苯的络合作用。这允许区分依赖于流动的输运过程和与流动无关的界面反应作为速率控制的替代方案。在没有表面活性剂(所谓的碱性体系)的情况下，测量的传质速率受到传输过程或界面反应的限制，这取决于锌离子浓度的水平。在界面通量为慢界面反应区域，锌离子浓度与双硫腙浓度呈线性关系，质子浓度与锌离子浓度呈一级倒数关系。由于两亲层间的相互作用与界面反应是界面反应的重点。
This contribution concerns chemical mass transfer between liquid phases with the main question directed to the action of adsorbed amphiphilic layers at the interface. As the model system, the complexation of zinc ions (aqueous phase) with dithizone (toluene phase) was selected, measured with the stirred cell technique. This allows the discrimination of flow-dependent transport processes from the flow-independent interfacial reactions as the rate-controlling alternatives. In the absence of surfactants (the so-called base system) the measured rate of mass transfer is shown to be limited by transport processes or interfacial reactions, depending on the level of the zinc ion concentration. In the regime of slow interfacial reactions for the interfacial flux, a linear dependency of the zinc ion and the dithizone concentration and a reciprocal first-order influence for the proton concentration were observed. Because the interaction of amphiphilic layers with the interfacial reaction was the main point of intere...