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- W91808339 abstract "Surfactants significantly influence foam stability. Detailed theoretical analysis of this influence is deficient at present. This paper presents an experimental investigation into the influence of surfactants on foam stability measured by the foam lifetime. The surfactants studied included sodium dodecyl sulphate (SDS) and the surfactants of the Dowfroth frother surfactant series used in the flotation separation of minerals. The foaming experiments were carried out in a laboratory flotation column by blowing air through a sparger. The physical properties of the foaming systems versus the surfactant concentration were experimentally determined for the surface tension, bubble size, and interfacial viscosity. The pendant drop method was used for surface tension measurement for various concentrations of SDS and the Dowfroth frother series. The bubble size was determined using a photography technique. The interfacial viscosity was determined with a deep-channel interfacial viscometer. The obtained physical parameters of foams were not able to describe the dependence of the foam lifetime on the surfactant concentration. As the interfacial shear viscosity, which significantly influences the liquid drainage in foam, is not directly correlated with the foam lifetime it is possible that the foam stability is to a great extent controlled by the rupture of the intervening liquid films residing between bubbles." @default.
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- W91808339 date "2003-01-01" @default.
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- W91808339 title "Influence of surfactants on foam stability" @default.
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