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Influence of Crystallization Conditions on the Growth of Polycrystalline Particles
Author(s) -
Beck R.,
Flaten E.,
Andreassen J.P.
Publication year - 2011
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201000543
Subject(s) - supersaturation , vaterite , crystallite , crystallization , calcium carbonate , chemical engineering , aqueous solution , chemistry , particle size , crystal growth , materials science , mineralogy , crystallography , organic chemistry , aragonite , engineering
Abstract The effect of initial supersaturation and temperature on crystal morphology below and above the threshold for the onset of spherulitic growth has been compared for calcium carbonate, L ‐glutamic acid, and an aromatic amine derivative in aqueous systems. For the vaterite polymorph of calcium carbonate is has also been documented how spherulites (polycrystalline particles) develop with time in a solvent mixture of water and monoethylene glycol. For the three studied substances, the temperature was found to have different effects on the compactness of the crystals. The influence of supersaturation on the onset of spherulitic growth and particle morphology, however, bears striking similarities for the investigated substances. While monocrystalline particles are found at low supersaturation, polycrystalline particles form with increasing degree of branching when supersaturation is increased.