Nomoto Tomonori, Toyota Taro, Fujinami Masanori
Department of Applied Chemistry and Biotechnology, Chiba University.
Anal Sci. 2014;30(7):707-16. doi: 10.2116/analsci.30.707.
An inhomogeneous distribution of interfacial tension can induce different types of non-equilibrium spontaneous motion at the interface by convective flow, or by the solutal Marangoni effect. Several applications of the quasi-elastic laser scattering (QELS) method used to study these effects are presented here. The relationship between the interfacial tension and the non-equilibrium phenomena has been verified experimentally for each application. In a water/nitrobenzene oscillatory system with continuous surfactant addition to the interface, the local adsorption of surfactants at the interface has been demonstrated and shown to be strongly related to the presence of electrolytes. In a donor/membrane/acceptor system, the dual-beam QELS method shows that surfactant adsorption at the membrane/acceptor interface is responsible for oscillations in the electric potential. The differences in the adsorption/desorption behavior of metal complex catalysts between air/liquid and liquid/liquid interfaces were considered in the propagating chemical waves of the Belousov-Zhabotinsky reaction. We successfully measured the distribution of interfacial tension around a self-propelled camphor boat and an alcohol droplet floating on an aqueous phase, and compared the mechanisms of their motion.
界面张力的不均匀分布可通过对流或溶质马兰戈尼效应在界面处引发不同类型的非平衡自发运动。本文介绍了用于研究这些效应的准弹性激光散射（QELS）方法的几种应用。对于每种应用，界面张力与非平衡现象之间的关系已通过实验得到验证。在向界面连续添加表面活性剂的水/硝基苯振荡体系中，已证明表面活性剂在界面处的局部吸附，且表明其与电解质的存在密切相关。在供体/膜/受体体系中，双光束QELS方法表明表面活性剂在膜/受体界面的吸附是电势振荡的原因。在贝洛索夫 - 扎博廷斯基反应的传播化学波中，考虑了金属络合物催化剂在气/液和液/液界面处吸附/解吸行为的差异。我们成功测量了自行推进的樟脑船和漂浮在水相上的酒精液滴周围的界面张力分布，并比较了它们的运动机制。
