Bimodal colloidal mixtures: From fast to slow aggregation regions

► We model the aggregation kinetics of bimodal colloidal mixtures with different sizes but similar surface chemistries. ► Under fast aggregation conditions, the homoaggregation of least stable component dominates the initial stability. ► With the electrolyte ionic strength decreasing (toward the slow aggregation), the hybrid aggregation including the homo- and hetero-aggregation gradually dominates the initial stability.