Quasi-elastic Laser Scattering for Measuring Inhomogeneous Interfacial Tension in Non-equilibrium Phenomena with Convective Flows

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 pres...

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Bibliographic Details
Published in:Analytical Sciences 2014/07/10, Vol.30(7), pp.707-716
Main Authors: NOMOTO, Tomonori, TOYOTA, Taro, FUJINAMI, Masanori
Format: Article
Language:English
Subjects:
Adsorption
alcohol droplet
Analytical Chemistry
autonomous oscillation
Belousov–Zhabotinsky reaction
camphor boat
Chemistry
Convective flow
Droplets
Interfacial tension
Lasers
Liquids
Marangoni effect
Scattering
Special Reviews
surface tension
Surfactants
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Summary: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.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.30.707