Measuring zeta potential in concentrated industrial slurries

The main practical and theoretical problems encountered in continuous monitoring of the zeta potential of concentrated industrial slurries are discussed. A suitable method must be able to make measurements in real time on flowing concentrates and provide a reliable assessment of the zeta potential from the measured parameters. It is shown that the electroacoustic method offers great advantages for this measurement and examples are given of its application in the study of oxides like titania and alumina and a bitumen-in-oil emulsion. In its application in computer chip manufacture (chemical mechanical polishing) a combination of electroacoustics and acoustic attenuation can widen the range and improve the reliability of the assessment of zeta potential and suspension stability.