INCREASE IN THE THERMOELECTRIC EMF OF COLLOIDAL SOLUTIONS AS A RESULT OF DIALYSIS PURIFICATION

Abstract

Aim. The paper presents an experimental study of thermoelectric properties of colloidal solutions and the effect of dialysis purification on these properties, using the example of colloidal solutions of silver iodide. Methodology. The paper uses standard methods for measuring the coefficient of thermoelectric EMF and the coefficient of electrical conductivity used for electrolyte and colloidal solutions. To purify colloidal solutions from the ions present in them, the method of dialysis purification using semipermeable membranes is used. Results. It is shown that during the removal of ions from colloidal solutions, their thermoelectric EMF increases in absolute value, while the coefficient of electrical conductivity decreases. The observed increase cannot be explained only by the effect of an increase in the thermoelectric strength of the ionic electrolyte solution with a decrease in its concentration. The results obtained can be explained in the framework of the thermodynamics of irreversible processes as a consequence of an increase in the transfer numbers of large colloidal particles, which, unlike ions, have initially high values of the transfer heat. Research implications. The results of the study contribute to the theory of transport phenomena in dispersed colloidal systems.