DIELECTRIC BEHAVIOR OF COLLOIDAL DISPERSIONS

During the past few years, considerable effort has been devoted to und erstanding the character of the particle-solution interface using elec trokinetic methods. Recent experimental work has uncovered striking di screpancies between experiment and the classical theory. Ion migration behind the shear surface is one mechanism postulated to explain matte rs. Accordingly, the theory was extended to include this mechanism and a numerical methodology was developed to solve the equations for part icles in an oscillatory electric field. The results show considerable promise. Comparisons between theory and experiment indicate that allow ing for surface transport can reconcile measurements of the mobility o f individual particles with measurements of the dielectric behavior of a dilute suspension.