Abstract
Brownian dynamics simulation on aggregation of submicron particles was conducted and fractal dimensions of aggregates were calculated in order to estimate aggregate size and shape quantitatively. A Langevin equation, that included fluid resistance, random force, and gravity, was solved. Three models were employed for particle aggregation: DLA(Diffusion-Limited Aggregation) model, a model in which many particles moved simultaneously and formed one aggregate, and a model in which many particles and aggregates moved simultaneously and formed aggregates. As a result of DLA model, fractal dimension increased with decrease in particle size and increase in ambient temperature. Particle size more greatly affected aggregate shapes than ambient temperature. The aggregate shape changed depending on the model for aggregation.
