Effect of Temperature Dependence of Deformation Polarizability and Ionization Energy of Solvents on Surface Properties of Solid Materials

In recent research works, an original method based on the London interaction equation was proposed for the determination of London dispersive and polar properties of solid surfaces. The published results showed an important deviation of the surface properties of materials compared to the classic methods. However, in the previous papers, the ionization energy and deformation polarizability were supposed as constants against the temperature. In this work, we studied the temperature effect of the above parameters on the various surface variables of the adsorption of organic solvents on solid surfaces as alumina, titania, and magnesium oxide. Inverse gas chromatography at infinite dilution was used to determine the net retention volume of the adsorbed solvents on solid surfaces, allowing the determination of the free energy of adsorption, the London dispersive and polar energy, the Lewis acid-base parameters, and the acid-base surface energies. The obtained results reflect the important role of the thermal effect on the values of the ionization energy and deformation polarizability of solvents and solid materials, and consequently on the surface properties of solid materials. The results showed that the small variations of the ionization energy and deformation polarizability of solvents against the temperature induced notable shifts in the surface thermody-namic parameters of alumina, titania, and magnesium oxide including changes in the London dispersive and polar components of the free energy of adsorption by up to 100% in many adsorbed solvents, and variations in the Lewis acid–base constants of solid surfaces reaching 200% in the case of MgO. The sensitivity of surface parameters to these molecular properties emphasizes the importance of considering temperature effects in surface–molecule interactions.