Research Grant Report
Characterization of Surface Charge and Packing State by Streaming Potential Method
2006 Volume 14 Pages 71-75
Details
2006 Volume 14 Pages 71-75
The particle packing state and surface charge condition of the cake layer formed during microfiltration of PMMA latex beads were characterized by the streaming potential method. It was confirmed that in later stage of the cake filtration the streaming potential depended on particles forming the filtration cake regardless of membranes used. The packing state and surface charge condition of the cake layer were characterized by the analyzing the conductivity dependence of the streaming potential of the cake layer with a space charge model as fitting parameters of 2rp , which is an index of the distance between particles in the cake layer, and qp , which is the surface charge density of the particles. These fitting parameters reflected the effects of the particle size and voidage of the cake layer and the change in 2rp was consistent with the change in the cake structure. These observations showed that the streaming potential method for filter cakes can be used for the characterization of the packing state and surface charge condition of particles.
