流動電位法によるナノ粒子充填構造と表面荷電状態評価

抄録

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 2r_p , which is an index of the distance between particles in the cake layer, and q_p , 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 2r_p 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.