Nonlinear spontaneous oscillations at the liquid/liquid interface produced by surfactant dissolution in the bulk phase

Article Abstract:

The result of theoretical and experimental studies of spontaneous nonlinear oscillations produced at the liquid/liquid interface by surfactant transfer from a point source situated in one of the bulk phases are presented. It is concluded that auto-oscillations at the air/liquid and liquid/liquid interfaces are governed by very similar mechanism but their characteristics are strongly dependent on the properties of the two contacting media, in particular, on the surfactant partition coefficient.

Liquids

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Thermodynamics of aqueous poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)/surfactant mixtures. Effect of the copolymer molecular weight and the surfactant alkyl chain length

Article Abstract:

The effect of the hydrophobicity of the surfactant, the copolymer molecular weight, at constant hydrophobic/hydrophilic ratio, and the hydrophilicity of the copolymer on the interactions between EOaPObEOa and sodium alkanoates is investigated by calorimetry at 298 K. It concluded that L64 has a larger hydrophobic character than F68 and the copolymer molecular weight plays a small role.

Analysis, Molecular weights, Alkyl groups, Chemical thermodynamics

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Surfactant transfer through a liquid membrane: Origin of spontaneous oscillations at the membrane/acceptor phase interface

Article Abstract:

Instability due to surfactant redistribution in a liquid membrane system consisting of two solutions separated by a layer of immiscible liquid was theoretically studied. A mechanism of oscillation, which develops at the membrane/acceptor phase interface, was proposed on the basis of direct numerical simulation of the system evolution.

Phase transformations (Statistical physics), Phase transitions (Physics), Chemical reactions

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