Abstract
A novel method for a quantitative determination of surfactant adsorption on the muscovite mica basal plane by means of ESCA is reported. The known three-dimensional chemical structure of mica, especially the number of exchangeable ions on the molecularly smooth surface, is utilized as an internal standard. Results obtained with this method for dimethyldioctadecylammonium ion adsorption are shown to yield a quantitative agreement with transfer ratios measured using a Langmuir—Blodgett technique. Adsorption isotherms of primary alkylammonium ions on the basal plane of muscovite mica am characterized by a first cooperative adsorption step occurring at low surfactant concentrations. At higher solution concentrations a further, much slower increase in the surface density of adsorbed molecules is observed. The relevance of these results for the understanding of flotation and contact angles is briefly discussed.
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