We formulate a model for the peptization of titania nanocolloids. The model assumes simultaneous agglomeration/deagglomeration with size- independent rate constants. It predicts that the evolution of the particle size exhibits first-order kinetics and that the final particle size scales as R ~ C(1/df), where C is the mass concentration of the colloid and d(f) is the fractal dimension. These predictions are tested experimentally. We find that the model provides a quantitative and consistent description of the peptization process over a wide range of experimental variables and that it allows the determination of the aggregation and deaggregation rate constants from the time evolution of the average size.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry