Abstract
The stability of dispersions of fine particles with respect to coagulation due to Brownian motion and hydrodynamic shear has been examined. Conditions which lead to coagulation in either the primary or the secondary minimum in the interaction energy/ particle separation relationship have been considered. A set of four criteria have been defined corresponding to: primary Brownian, primary shear, secondary Brownian and secondary shear coagulation. Based on these criteria, the effects of particle size on stability are discussed at length. Stability domain diagrams have been constructed which can be used to estimate stable and unstable size ranges in polydisperse suspensions.
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