INTERLAMELLAR ADSORPTION OF BINARY-LIQUID MIXTURES AND SOLUTIONS ON PARTIALLY HYDROPHOBIZED SILICATE SURFACE

The solid/liquid interfacial sorption was investigated in miscible and partially miscible binary mixtures on swelling and non-swelling layer silicates. The solid surface was hydrophobized by cationic surfactant s with different surface densities and the surface modification was ch aracterized by determination of adsorption excess isotherms, microcalo rimetric experiments and X-ray diffraction. It was established that th e surface hydrophobicity can be characterized by combination of adsorp tion and calorimetric data. The degree of swelling on different adsorb ents can be controlled not only by X-ray diffraction experiments, but also by the surfacial entropy functions calculated from the free entha lpy and enthalpy of adsorption.