Add time:07/28/2019         Source:sciencedirect.com

The kinetics of the flocculation of nanosized silica particles (5 nm) with cationic amylopectin has been investigated with stopped-flow technique. The flocculation process has been followed with turbidity. A kinetic mechanism is suggested where the initial process is a bridging flocculation. In this process the large amylopectin,molecules gather a number of the small silica particles forming a polyelectrolyte complex. This process is followed by a collapse of the formed flocs. These processes have time constants of less than 1 s. In a subsequent process the polyelectrolyte complex may also flocculate on a larger time scale, several seconds. The effect of mono- and divalent ions on the flocculation processes has been investigated. A large effect was found when a monovalent cation was replaced by a divalent cation indicating that the electrostatic screening of the silica particles is the most important factor.

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