Based on the hypothesis that cyclic voltammetry applied to the interface formed by two immiscible electrolyte solutions can be used for determining critical micellar concentrations (cmc) of charged surfactants provided they exhibit ion transfer currents, we have carried out the study of three perfluorinated acids (perfluoroctanoic acid, PFO, perfluorononanoic acid, PFN, and perfluorodecanoic acid, PFD), dissolved in the aqueous phase. Cyclic voltammetry at the water/1,2-dichloroethane interface as well as fluorescence and surface pressure measurements, have been employed for cmc determinations and comparison. From the variation of voltammetric parameters on surfactant concentration it was possible to determine the cmc for these surfactants, obtaining good agreements with other methodologies. Impedance spectroscopy experiments have been also carried out to characterize the properties of the interface, demonstrating that at high surfactant concentration values, a monolayer with different domains is formed.

基于以下假设：如果循环伏安法应用于由两种不混溶的电解质溶液形成的界面，可以用于确定带电表面活性剂的临界胶束浓度（cmc），前提是它们具有离子转移电流，因此我们进行了三种全氟酸（全氟辛酸）的研究。酸（PFO），全氟壬酸（PFN）和全氟癸酸（PFD）溶解在水相中。水/ 1,2-二氯乙烷界面的循环伏安法以及荧光和表面压力测量已用于cmc测定和比较。通过改变伏安法参数对表面活性剂浓度的影响，可以确定这些表面活性剂的cmc，与其他方法获得了良好的一致性。