Experimental studies on the geometrical characteristics determining the system behavior of surface tension autooscillations

Grigorieva, O. V.; Kovalchuk, N. M.; Grigoriev, D. O.; Vollhardt, D.

doi:10.1016/s0021-9797(03)00128-0

Cited by 20 publications

(28 citation statements)

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“…4 Chemical oscillations at a liquid/liquid interface have also been drawing attention from researchers in terms of not only the nonlinear chemistry but also for studies of biomimetic system. Since Dupeyrat and Nakache 5 first reported the electrochemical potential oscillation at the water/nitrobenzene interface in the 1970's, many kinds of chemical oscillation systems, not only water/oil two-phase systems 5-11 but also water/oil/water threephase systems 12-28 or gas/liquid interfaces, [29][30][31][32] have been developed and extensively investigated.Recently, we found a new-type interfacial oscillatory phenomenon with periodic adsorption and desorption of sodium alkyl sulfate at a water/nitrobenzene interface. [23][24][25][26] As previously reported in other interfacial oscillations, our system also shows an oscillation of electrical potential between the aqueous phase and the oil.…”

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confidence: 99%

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confidence: 99%

“…These mechanisms can be classified into two main groups: one explanation is that the oscillation includes the rapid adsorption of molecules or ions followed by gradual desorption, [29][30][31][32] and the other is the opposite. [6][7][8]10,12,17 In addition, Maeda et al 13,14 gave a novel explanation focusing on the generation and reduction of the maximum wave in the ion transfer polarograms.…”

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confidence: 99%

“…The most popular form of interfacial tensiometry for investigating the chemical oscillation is a Wilhelmy plate method. 5,8,10,11,20,22,[29][30][31][32] One can measure the interfacial tension by directly measuring the force acting on a small glass or platinum plate in contact with the interface. However, such a contact probe physically disturbs the interface and might change the dynamic behavior of molecules at the interface.…”

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confidence: 99%

“…As far as we know, precise discussions on the hydrodynamic effect have been limited to some reports. 16,20,[29][30][31][32] Since the movement of liquid can cause a flow of liquid near the interface and can substantially change the mass transfer, it is important to understand how the instability at the interface was generated and how the movement of the interface occurred. Therefore, we also focused on the movement of the interface in the chemical oscillation system as well as the adsorption and desorption of the surfactant ions; we analyzed the dynamic behavior of the liquid under the chemical oscillation with the aid of the video images taken by a CCD camera.…”

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Chemical Oscillation with Periodic Adsorption and Desorption of Surfactant Ions at a Water/Nitrobenzene Interface

et al. 2004

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An interface formed by two immiscible liquids is a specific area where chemical composition and physical properties steeply change on the nano-meter scale.1 Some characteristic phenomena are found: for example, adsorption and desorption of molecules, molecular recognition, 2,3 solvent extraction. 4 Chemical oscillations at a liquid/liquid interface have also been drawing attention from researchers in terms of not only the nonlinear chemistry but also for studies of biomimetic system. Since Dupeyrat and Nakache 5 first reported the electrochemical potential oscillation at the water/nitrobenzene interface in the 1970's, many kinds of chemical oscillation systems, not only water/oil two-phase systems 5-11 but also water/oil/water threephase systems 12-28 or gas/liquid interfaces, [29][30][31][32] have been developed and extensively investigated.Recently, we found a new-type interfacial oscillatory phenomenon with periodic adsorption and desorption of sodium alkyl sulfate at a water/nitrobenzene interface. [23][24][25][26] As previously reported in other interfacial oscillations, our system also shows an oscillation of electrical potential between the aqueous phase and the oil. The electrical potential is generated by unbalanced distribution of charged elements, which is not a simple phenomenon because such a situation is caused by adsorption of ions at the liquid/liquid interface, differences of concentration of the ions between the two liquid phases, and differences of ion mobility across the interface. As a result, understanding the chemical oscillation only from an electrical potential measurement is quite difficult. That is why, while most experiments showed a periodic oscillation pattern of electrical potential as a common property, the mechanisms proposed were not always similar. Agriculture and Technology, Japan Chemical oscillations with periodic adsorption and desorption of surfactant ions, alkyl sulfate ions, at a water/nitrobenzene interface have been investigated. The interfacial tension was measured with a quasi elastic laser scattering (QELS) method and the interfacial electrical potential was obtained. We found that this oscillation consists of a series of abrupt adsorptions of ions, followed by a gradual desorption. In addition, we observed that each abrupt adsorption was always accompanied by a small waving motion of the liquid interface. From the analysis of the video images of the liquid interface or bulk phase, we could conclude that each abrupt adsorption is caused by nonlinear amplification of mass transfer of ions from the bulk phase to the liquid interface by a Marangoni convection, which was generated due to local adsorption of the surfactant ions at the liquid interface that resulted in the heterogeneity of the interfacial tension. In the present paper, we describe the mechanism of the chemical oscillation in terms of the hydrodynamic effect on the ion adsorption processes, and we also show the interfacial chemical reaction with ion exchange during the ion desorption process.

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