Formation of Monodispersed Cadmium Sulfide Particles by Aggregation of Nanosize Precursors
Sergiy Libert, Vyacheslav Gorshkov, Vladimir Privman, Dan Goia, Egon Matijevic
Abstract
Monodispersed spherical cadmium sulfide particles were used as a model system in order to explain the size selection in the formation of colloids by aggregation of nanosize subunits. Several procedures of mixing the reactants were employed to precipitate these solids and follow the kinetics of particle growth. Efficient numerical simulation techniques for the model rate equations were developed to fit the experimental results. Our results have confirmed the recently proposed mechanism of two-stage growth by nucleation of nanosize crystalline primary particles and their subsequent aggregation into polycrystalline secondary colloids.
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