Journal
CRYSTAL RESEARCH AND TECHNOLOGY
Volume 44, Issue 4, Pages 395-401Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/crat.200800065
Keywords
aragonite; monodispersed microspheres; carbonation crystallization
Categories
Funding
- Ministry of Science and Technology of China [2006BAC02A14]
- State Key Development Program for Basic Research of China [2007CB613507]
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Monodispersed calcium carbonate microspheres were prepared by carbonating a calcium acetate aqueous solution with CO gas at a high pressure of 40 bar and a high temperature of 80 degrees C after 60 minutes of reaction. The products were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM), respectively. The XRD pattern showed that the crystal polymorph of the as-prepared monodispersed microspheres was aragonite. The SEM images also displayed needle-like aragonite self-organized into microsphere superstructure with diameters ranging from 5 to 15 mu m. Analysis of the formation mechanism of the calcium carbonate microsphere superstructure revealed that the rod-dumbbell-sphere morphogenesis mechanism along with the phase transformation of vaterite to aragonite was responsible for the growth of the monodispersed aragonite microspheres. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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