Electrical Aspects of Adsorbing Colloid Flotation. XI. Surfactant Adsorption Isotherms, Particle Displacement, and Differential Capacitance

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Abstract
Statistical mechanics is used to calculate adsorption isotherms of ionic surfactants on charged solid-water interfaces. The effects of coulombic repulsions between the ionic heads of the surfactant species are taken into account, as are the van der Waals attractions of their hydrocarbon tails. A “squeeze-out” mechanism, by means of which viscous drag forces acting tangentially to the surface of a rising bubble may detach floc particles from it, is examined. A nonideal Poisson-Boltzmann equation is used to calculate the differential capacitance of the electric double layer at an interface.