阳离子表面活性剂溶液的临界胶束浓度及扩散系数

Study on micelle diffusion coefficient of aqueous cationic surfactants solution system and their first-,and second critical micell concentration (CMC)by electrochemistry

在无探针分子条件下用循环伏安法(CV)研究了DTAB,TTAB,CTAB,OTAB水溶液体系胶束在玻碳电极(GCE)上的电化学行为,并用电位阶跃计时库仑法(CC)测定了胶束的扩散系数,进而得到第一与第二CMC,该方法简捷、快速、准确。对离子型表面活性剂的第二CMC提供了新的测定方法。

Electrochemical behaviors of aqueous DTAB,TTAB,CTAB and OTAB solution system without probe molecule were investigated by cyclic voltammetry(CV)using glassy carbon electrode(GCE),their diffusion coeffcients further studied by potential-step chronocoulometry(CC),and the first and the second critical micell concentration(CMC)were obtained as well.The electrochemical experimental results showed that the new method was of simplicity,quickness and accuracy.