Thermoelectrokinetic Effect in Colloidal Solutions of Tanin Under Conditions of Suppressed Natural Convection

The paper deals with the results of experiments to investigate the thermoelectrokinetic effect in colloidal solutions of tannin. As the theoretical analysis and results of mathematical modeling show, in the classical formulation of the experiment to measure the thermoelectrokinetic EMF, significant upward free-convective flows should be formed, which significantly distort the temperature and velocity field of the electrically conducting medium. In addition, in this case it is impossible to achieve a significant temperature gradient, the value of thermoelectrokinetic EMF depends on its value. As experiments show, in colloidal solutions of tannin at suppression of free-convective flows a noticeable thermoelectrokinetic effect is observed, which exceeds similar values for solutions of ionic electrolytes.