OTAB胶束的扩散系数及第一和第二CMC的电化学研究

在前期工作基础上，根据阳离子表面活性剂十八烷基三甲基溴化铵(OTAB)水溶液体系中胶束在玻碳电极(GCE)上的电化学行为，在一定条件下电极过程为扩散步骤控制，在无外加探针分子的条件下用循环伏安法(CV)研究了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OTAB胶束的扩散系数。依据阳离子表面活性剂水溶液体系胶束粒子的扩散系数与胶束粒子形状及结构之间的关系进而测得OTAB水溶液体系胶束的第一CMC与第二CMC。实验结果表明：该方法简捷、快速、准确，特别是为研究离子型表面活性剂的第二CMC提供了一种新的测定方法。

Study on micelle diffusion coefficient of aqueous OTAB solution system and its First and Second Critical Micelle Concentration (CMC) by electrochemistry

Based on the previous work, the electrochemical behavior of micelle of aqueous OTAB solution of anion surfactant on glassy carbon electrode, and in the condition of the electrode process as a diffusion control step, electrochemical behaviors of OTAB solution system without probe molecule have been investigated by cyclic voltammetry (CV) using glassy carbon electrode (GCE),the diffusion coefficients have been further studied by potential-step chronocoulometry (CC). According to the relationship between diffusion coefficients and the shape and structure, the First and the Second Critical Micelle Concentration (CMC) has been obtained as well. The electrochemical experimental results show that the method is of simplicity, quickness and accuracy, and especially it provides a new measurement for the determination 'of second CMC of the aqueous ionic surfactants solution system.