The kinetics of oxidation of vanillic acid by colloidal MnO₂ in an acidic medium was investigated and used as a probe to study the micellar catalysis and its correlation to micellar properties of surfactants. Three surfactants were employed; cationic cetyltrimethylammonium bromide (CTAB), anionic sodium dodecylsulfate (SDS), and non-ionic Tween-20 (TW-20), and some compositions of the two mixed systems CTAB-TW-20 and SDS-TW-20. The micellar properties were studied using the conductivity method. The reaction rate was enhanced in the presence of the three surfactants and the mixed systems. The catalytic profiles of the pure and mixed surfactant systems could be used to estimate the critical micelle concentrations of surfactant catalytic systems. Nevertheless, the kinetic measurements could not detect the variations in the micellar structures that occur at post-micellar compositions. Overall, the mixed systems studied showed a negative deviation of ideality with synergetic interaction. Therefore, Rubingh equations were used to calculate the micellar mole fraction and interaction parameters in the mixed surfactant systems.

胶体MnO ₂氧化香草酸的动力学在酸性介质中研究并用作探针来研究胶束催化及其与表面活性剂胶束性质的相关性。使用了三种表面活性剂；阳离子十六烷基三甲基溴化铵（CTAB）、阴离子十二烷基硫酸钠（SDS）和非离子Tween-20（TW-20），以及CTAB-TW-20和SDS-TW-20两种混合体系的部分组成。使用电导率方法研究胶束性质。在三种表面活性剂和混合体系的存在下，反应速率得到提高。纯表面活性剂和混合表面活性剂体系的催化曲线可用于估计表面活性剂催化体系的临界胶束浓度。然而，动力学测量无法检测到胶束后组合物中胶束结构的变化。全面的，研究的混合系统显示出具有协同相互作用的理想性的负偏差。因此，Rubingh 方程用于计算混合表面活性剂体系中的胶束摩尔分数和相互作用参数。