The effect of the degree of dissociation on the adsorption kinetics of partially dissociated ionic surfactants was examined theoretically. The equilibrium and dynamic surface tension (ST) curves with different degrees of dissociation were theoretically generated for surfactants following the Langmuir adsorption isotherm. Two cases were examined. In the first case, it was examined what mistake would be obtained if a non-ionic model or an ionic model was simply used to describe the equilibrium and dynamic simulated ST data of a partially dissociated surfactant. The second case considered the mistake when a non-ionic model was used on an ionic surfactant. The results of this study show that either the ionic or nonionic model can provide a reasonably good description of the equilibrium/dynamic ST curves of a partially dissociated ionic surfactant. When a non-ionic model was applied to describe an ionic surfactant, a reasonably good fitting was also obtained for the equilibrium and dynamic ST data. However, a significant deviation of the model parameters and surfactant diffusivity was obtained. The results in this study indicate that it is difficult to detect an improper choice of the degree of dissociation from the quality of fitting of the equilibrium and dynamic ST data.

理论上研究了解离度对部分解离的离子型表面活性剂吸附动力学的影响。理论上，按照Langmuir吸附等温线，可以生成表面活性剂具有不同解离度的平衡和动态表面张力（ST）曲线。检查了两个案例。在第一种情况下，研究了如果仅使用非离子模型或离子模型来描述部分解离的表面活性剂的平衡和动态模拟ST数据，将会产生什么错误。第二种情况考虑了在离子表面活性剂上使用非离子模型时的错误。这项研究的结果表明，无论是离子模型还是非离子模型，都可以对部分离解的离子表面活性剂的平衡/动态ST曲线提供合理的描述。当使用非离子模型描述离子表面活性剂时，对于平衡和动态ST数据也获得了相当好的拟合。但是，获得了模型参数和表面活性剂扩散率的显着偏差。在这项研究结果表明，这是很难从平衡和动态数据ST拟合的质量检测解离度的选择不当。