ELECTROKINETIC AND RHEOLOGICAL PARAMETERS OF WATER IN A SINGLE CAPILLARY

An experimental setup is suggested for simultaneous studying of the streaming current and electroosmotic counterpressure phenomena in a single capillary slit. The experiments are performed with saturated AgCl water solution at room temperature. The results of the experiments confirm previously suggested theological theory and they are: the streaming current is a nonlinear function of the driving pressures in capillaries with high surface potentials; ζ-potentials, determined from streaming current experiments, were much lower than those determined from electroosmotic pressure measurements; the difference between them decreases with decreasing surface potentials. Experimental results are used to compute values of surface potentials and rheological parameters. This is done by minimization of a suggested error function. A 93% agreement between theory and experiment is found. © 1979.