The effects of silica and sugar on the crystallographic and morphological properties of calcium oxalate

Yu, Hong, Sheikholeslami, Roya, & Doherty, William O.S. (2004) The effects of silica and sugar on the crystallographic and morphological properties of calcium oxalate. Journal of Crystal Growth, 265(3-4), pp. 592-603.

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The phase transformation and crystal morphology of calcium oxalate (CaOx) formed in water and sugar solutions and CaOx formed in CaOx–silica (SiO2) systems with and without sugar have been investigated using a combination of instrumental techniques including X-ray powder diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy, and FT-IR spectroscopy. Addition of SiO2 or sugar in CaOx crystallization system selectively promoted the formation of COT and COD, respectively, and modified the crystal size and habit of COM crystals, the extent of which was dependant on the concentrations of SiO2 and sugar. CaOx–SiO2 co-precipitation in sugar solutions led to the stabilization of either COD or COT, depending on the initial concentration of CaOx. A variety of mechanisms including electrostatic effects, geometrical matching and stereochemical compatibility between CaOx crystallites and polymeric SiO2/sucrose molecules have been proposed to account for the observed crystallographic and morphological changes of CaOx.

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ID Code: 11147
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see hypertext link) or contact the author.
Keywords: Crystal morphology, Growth from solutions, Solid phase epitaxy, Amorphous silica, Calcium oxalate, Sugar
DOI: 10.1016/j.jcrysgro.2004.02.009
ISSN: 0022-0248
Divisions: Current > Research Centres > Centre for Tropical Crops and Biocommodities
Current > QUT Faculties and Divisions > Division of Research and Commercialisation
Copyright Owner: Copyright 2004 Elsevier
Deposited On: 07 Dec 2007 00:00
Last Modified: 29 Feb 2012 13:31

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