ELECTROPHORETIC 3D-MOBILITY PROFILES OF LATEX-PARTICLES WITH DIFFERENT SURFACE GROUPS

Latex particles with divergent characteristics, Like surface morpholog y, charge, and functional groups, were synthesized. In particular, hyd roxyl functions were investigated in different surroundings. The techn ique of electrophoretic fingerprinting was applied to determine and il lustrate the complex colloidal behavior in aqueous medium under variat ion of pH and ionic strength. BD-profiles of electrophoretic mobility showed a separation of our latex particle types into two classes: (a) mobility is dominated by a salt dependence, and (b) pH dependence domi nates the electrophoretic behavior. Independent surface charge density data, from streaming potential or flocculation measurements, were hel pful in interpreting the electrophoresis characteristics.