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Croatica Chemica Acta, Vol.80 No.3-4 November 2007. -

The relationship of the shape and structure of uniform colloidal particles to different mechanisms

of formation by precipitation in homogeneous solutions is reviewed. Specifically, conditions

leading to a amorphous spheres, b nonspherical crystals of different shapes, and c

polycrystalline particles of different morphologies including spheres are distinguished. The last

case is observed when larger particles are formed by aggregation of nanosized precursors. It is

now recognized that the latter process is more common than previously understood. A model

explaining the size selection of monodispersed spheres by aggregation is illustrated in the case

of silver particles. It was also demonstrated that uniform polycrystalline particles of other

shapes are generated by the aggregation process. Challenges faced in the effort to develop at

least a semi-quantitative explanation of the shape factor in the latter case are outlined.

aggregation mechanism; colloid shape; partcles structures; precipitation

Autor: Egon Matijević - ; Center for Advanced Materials Processing Clarkson University, Potsdam, NY, USA Dan Goia - ; Center for Advanc



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