Maksymyuk M. Integral characteristics of the surfactant adsorption process for prediction of the properties of surfactant mixtures at the liquid - ges interface

In the dissertation, the study is performed of the role of integral characteristics of the surfactants adsorption process at the liquid-gas interface, aimed at the prediction of the properties of multicomponent mixtures. The objects of the study were the low-molecular saturated monobasic alcohols of the 1-pentanol - 1-octanol, acting as the non-ionic surfactants. To calculate the adsorption isotherms and integral characteristics of the adsorption of individual solutions of non-ionic surfactants from the experimental surface tension isotherms, the non-localised adsorption mo-del and Frumkin's model were employed. The integral characteristics of the adsorption of bicomponent solutions of non-ionic surfactants and corresponding surface tension isotherms at the liquid-gas interface were calculated using the Frumkin's model for the adsorption monolayer composed of two surfactants. To determine the surface tension of the surfactants, the method was developed capable for the experimental measurements of surface tension and contact angle of wetting of glass surface by the solutions of surfactants of various nature. It was shown that from the values of contact angle of wetting it is possible to predict the region of aggregation of disperse particles, which does not require the electrosurface studies of the particle surface. The method is proposed which comprise the use of anionic surfactant and inorganic coagulant in the flotoseparation processes.