Physicochemical influences on electrohydrodynamic transport in compressible packed beds of colloidal boehmite particles

Production and processing of colloidal particles require a deeper understanding of the surface charge of particles and the interaction of mass and charge transport in packed beds. The assessment of fundamental parameters is rather complex due to the additional influence of the particle charge on the structure of a packed bed. The combination of different measurement techniques (streaming potential and electroosmosis) allows for separating the effects, based on the postulation of a new method to quantify the ratio of surface conductance to liquid conductance. The purpose of this paper is to investigate the influence of pH value and compression on the electrohydrodynamic transport parameters.

The combined interpretation of electroosmosis and streaming potential permits the assessment of different influences on the electrohydrodynamic transport and correct measurement of the zeta potential ζ in packed beds, which is consistent with electroacoustic measurements.Figure optionsDownload as PowerPoint slide