EFFECTS OF POLY-ELECTROLYTE ON THE DEPOSITION AND DETACHMENT OF COLLOIDAL PARTICLES SUBJECTED TO FLOW

The kinetics of deposition and detachment of spherical latex particles onto and from glass surfaces in the presence of cationic polyelectrolyte and subjected to a stagnation point flow has been studied with the impinging jet technique. Conditions of barrierless deposition were created by adding a cationic polyelectrolyte (cat-floc) to the surface of the collector or the particles to achieve surfaces of opposite charge. Some differences between theory and experiment were found which could be explained by considering the effects of polyelectrolytes. When both particles and the glass surface are coated with cat-floc, no deposition occurs until a critical salt concentration is reached.