Oscillating Bubble Tensiometry: A New Method for Measuring the Kinetics of Surfactant Adsorptive-Desorptive Exchange

这项研究建议测量连接在针头上、淹没在表面活性剂水溶液中的振荡气泡的压力降。随着气泡表面积的膨胀和收缩，表面活性剂与表面发生交换，这种交换可以从压降数据踪迹中测量出来。提出了一种描述振荡交换的理论，并根据测量结果量化了表面活性剂的速率常数。一旦得到动力学参数，就可以用来解释表面活性剂对许多界面流动的影响。

The research suggests measuring the pressure drop across a oscillating bubble which is attached to a needle, and which is submerged in an aqueous surfactant solution. As the surface area of the bubble expands and contracts, surfactant exchanges with the surface, and this exchange can be measured from the pressure drop data trace. A theory is outlined to described the oscillating exchange, and from the measurements the surfactant rate constants can be quantified. Once obtained, the kinetic parameters can be applied to interpret the effects of surfactants on many interfacial flows.