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

Appearance of a solid phase from aqueous solution, known as precipitation, is responsible for

the formation of numerous natural materials and technological products. Therefore, the knowledge

on mechanisms of elementary processes involved in precipitation should be considered

in the areas such as geology, oceanology, biomineralization, medicine, basic chemical and

pharmaceutical industries, analytical and materials chemistry in particular. Calcium carbonates

are a very suitable model system for investigations of these processes. Owing to their low solubility,

a wide range of initial supersaturations can be achieved that direct to different conditions

under which a particular process dominates. Calcium carbonates can precipitate in the form of

six modifications polymorphic or hydrated. In the Laboratory for Precipitation Processes, systematic

investigations of the conditions for formation, crystal growth and transformation of

amorphous calcium carbonate, calcium carbonate hexahydrate, calcium carbonate monohydrate,

vaterite and calcite have been performed during the last nearly twenty years. An overview

of these studies is presented.

Calcium carbonates; calcite; vaterite; amorphous calcium carbonate; calcium carbonate hexahydrate; calcium carbonate monohydrate; elementary precipitation processes; mechanisms; kinetics

Autor: Ljerka Brečević - ; Laboratory for Precipitation Processes, Ruđer Bošković Institute, Zagreb, Croatia Damir Kralj - ; Labora

Fuente: http://hrcak.srce.hr/


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