Electroacoustic and dielectric response of suspensions of zeolites A and Y

The dynamic electrokinetic mobility spectra and dielectric response of suspensions of zeolites A and Y have been measured. The dynamic mobility data cannot be fit with the surface conductivity calculated from the zeta potential, but require the inclusion of a large stagnant layer conduction, which is attributed to ionic conduction within the micropores. With the constraint of a constant particle size the electroacoustic spectra give surface conductivity parameters which agree with those measured independently from the dielectric response. Negative zeta potentials that vary with salt concentration are then obtained from the electroacoustic spectra.