THE ELECTROACOUSTIC RECIPROCAL RELATION

In this paper we present experimental verification of the reciprocal r elation between the ultrasonic vibration potential (UVP) and the elect rokinetic sonic amplitude (ESA) effect for colloidal and electrolyte s ystems. Measurements of the ionic vibration potential at the lower end of the range of concentrations (0.001 M) require correction for the h igh internal impedance of the solution, while measurements of the ESA effect require correction at the high concentration end because the fi eld applied to the cell is significantly reduced when the cell resista nce is low. We also show how the ESA measurements on ionic solutions c an be used to calibrate the Matec ESA-8000 device. The resulting calib ration constant is in good agreement with that obtained by James et al . (1991) from measurements of a monodisperse suspension of spherical p articles.