ABSTRACT
Colloidal systems containing finely dispersed particles of solids in liquids are commonly met in everyday life, e.g., paints printing inks, polymer dispersions, photographic emul sions, pharmaceuticals, insecticides and pesticides, cosmetics, etc. Dispersion of solids can be prepared in different ways, e.g., by precipitation and stabilization of colloidal size particles or by comminution of large particles by grinding or milling. Whenever a new solid/liquid interface is formed some rearrangement of electrical charges in the interfacial region takes place so that the surface of the solid becomes charged.
