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Understanding the rate of aggregation of colloidal particles is very important to consider the transport of substances in water environments. Theoretical investigations on aggregation kinetics have been pexfonned by using trajectory analyses to elucidate the influence of electrochemical nd hydrodynamic interactions on aggregation. So far, however, this analysis has not been fully applied to the aggregation between unequal-sized particles with opposite sign of surface electric charge in a shear flow. In this study, the rate of shear hetemaggregation between oppositely charged and unequal-sized particles was evaluated by using the trajectory analysis. The calculated results indicate that the rate of heteroaggregation i creases with decreasing salt concentration and that the effect of attractive lectric double layer force is more significant at higher shear rates. At low salt concentrations, in addition, the present evaluation reveals that larger values of scaled capture efficiency were found not for the homoaggegation between equal-sized particles but for the hetemaggregation between unequal-sized particles. The calculation also suggests an experimental plan, that is, pure heteroaggregation without electric double layer effect can be obtained by using the binary mixture of oppositely charged and unequal-sized particles in 1-10mM aqueous solutions.

Aggregation of Unequal-sized and Oppositely Charged Colloidal Particles in a Shear Flow