Abstract
A liquid solution–solid surface system with a single-component adsorption of surfactant is considered. The case in which the surfactant is represented by dodecyltrimethylammonium bromide (DTAB), while the solid surface is silica, is considered. Based on the previously developed thermodynamic theory of adsorption on the solid surface assuming its deformation, the dependence of the thermodynamic evaluation of the Rehbinder effect on the bulk concentration of surfactant in solution is investigated analytically. In calculations, a clear S-shaped experimental adsorption isotherm of DTAB on the nondeformed surface is employed. Using this isotherm, a piecewise approximating function is plotted, which yields the necessary concentration dependence and conditions of its dome shape in terms of the parameters of the theory. Experimental characteristics (rate of drilling) on granite, quartz, and microcline are compared with the theory represented by the dependence of the thermodynamic evaluation of the Rehbinder effect on the concentration of DTAB.
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