Investigations reveal stable aggregates in binary diffusion-limited aggregation processes, indicating critical concentration thresholds.
Binary diffusion-limited cluster-cluster aggregation processes are studied as a function of the relative concentrationof the two species. Both, short and long time behaviors are investigated by means of threedimensionaloff-lattice Brownian Dynamics simulations. At short aggregation times, the validity of the Hogg-Healy-Fuerstenau approximation is shown. At long times, a single large cluster containing all initial particlesis found to be formed when the relative concentration of the minority particles lies above a critical value.Below that value, stable aggregates remain in the system. These stable aggregates are composed by a fewminority particles that are highly covered by majority ones. Our off-lattice simulations reveal a value ofapproximately 0.15 for the critical relative concentration. A qualitative explanation scheme for the formationand growth of the stable aggregates is developed. The simulations also explain the phenomenon of monomerdiscrimination that was observed recently in single cluster light scattering experiments.
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López et al. (2005) studied this question.
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