Department of Applied Physics I, University Complutense of Madrid, 28040 Madrid, Spain.
J Phys Chem B. 2009 Oct 1;113(39):12952-7. doi: 10.1021/jp903414z.
The effect of an ac sinusoidal perturbation of known amplitude and frequency superimposed to the usual dc applied electric voltage difference on the electroosmotic flow through three cation-exchange membranes with different morphology has been studied. A dispersion of the electroosmotic permeability on the frequency of the applied ac signal has been found for the three membranes investigated, observing that the electroosmotic permeability reaches maximum values for some characteristic values of the frequency. These characteristic frequency values, which are related to relaxation processes in heterogeneous media, depend on the membrane system and permit to obtain information about the different structures of the membrane system. Thus, the study of the electroosmotic permeability relaxation can be used as a method to study the internal morphology of a cation-exchange membrane in a given electrolyte medium.
已经研究了在通常的直流外加电压差上叠加已知幅度和频率的交流电正弦微扰对通过三种具有不同形态的阳离子交换膜的电渗流的影响。对于所研究的三种膜，发现电渗透渗透率随施加的交流信号频率而分散，观察到电渗透渗透率对于频率的某些特征值达到最大值。这些特征频率值与非均相介质中的弛豫过程有关，取决于膜系统，并允许获得有关膜系统的不同结构的信息。因此，电渗透渗透率弛豫的研究可以用作研究给定电解质介质中的阳离子交换膜的内部形态的方法。
