Abstract
Abstract Thinning rates of foam films, stabilized by surfactant mixtures of n-dodecyl-β- d -maltoside (C12G2 or G2) with hexaethyleneglycol monododecyl ether (C12E6 or E6), dodecanol (C12E0 or E0), and dodecyl trimethylammonium bromide (C12TAB or TAB) are studied and analysed. The influence on thinning of the film radius (0.05–0.15 mm), surfactant concentration (0.01–1.0 CMC), ionic strength (0.001 or 0.1 M NaCl) and mixture composition is investigated. It is found that: (i) the thinning rate falls with the increase in film radius and surfactant concentration in accord with the MTR-equation; (ii) for films from mixtures of 50:1 ratio the thinning rate correlates with that for films stabilized by pure C12G2 at all studied surfactant concentrations, additives and ionic strength levels; (iii) for films from mixed solutions of C12G2 with C12TAB the thinning rate depends on the ratio of the components in the adsorption layers; (iv) for films from mixtures of 1:1 ratio it is controlled by the component dominating in the adsorption layer. For the mixtures of C12G2 + C12E6 the thinning rate is determined primarily by C12E6, while for the C12G2 + C12TAB mixtures – by both components. The accelerated film thinning at low surfactant concentration and high ionic strength is associated with the potential effect of an additional non-DLVO force.
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