Investigation of the adsorption processes by radio-spectroscopic method

Abstract

The processes of electromagnetic radiation of radio-waves range in electrochemical systems are considered. Two potentials are applied simultaneously in these systems to the metal-solution interface, constant potential and low variable potential (with amplitude of 10 mv). The aim of the work is: research of the adsorbtion processes in electrochemical systems by radio-spectroscopic method. The adsorption processes of the organic molecules are of great interest for creation of optochemotropic sensors, for electrochemoluminescence and so on. The analytic expressions for coordinates and rate of particles in such system are received, also expressions for vector-potential of the electromagnetic radiation of the system, which is connected with this motion. The main result is existence of nonlinear, quadratic dependence between the signal of the electromagnetic radiation of the radio-wave range U and amplitude of a variable potential E, which is applied to the interface. The same dependence exist in electrochemical systems, where is not current. Obtained theoretical results are used for the analysis of the experimental data, which was received for adsorbtion-desorbtion of aliphatic alcohols. Although there is no charge transfer between the alcohol molecules and electrode during the adsorbtion, quadratic dependence between U and E is discovered for all peaks on desorbtion SHS- curves of butanol-1, butanol-2, hexanol, pentanol and isoamyl molecules on mercury electrode, for different concentrations of alcohols, different frequencies and significants of the amplitude of variable potential. Experimental results confirm the correctness of proposed theoretical model.