Journal
JOURNAL OF CRYSTAL GROWTH
Volume 311, Issue 17, Pages 4219-4225Publisher
ELSEVIER
DOI: 10.1016/j.jcrysgro.2009.07.010
Keywords
Biocrystallization; Nanostructure; Seed crystals; Calcium compounds
Funding
- Consorzio Interuniversitario di Ricerca in Chimica dei Metalli nei Sistemi Biologici
- University of Bologna
- Ministero dell'Istruzione dell'Universit e della Ricerca
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Hydroxyapatite is one of the most important bone substitute biomaterials. Here, it has been successfully overgrown on biogenic seed crystals at ambient conditions. Single crystals of calcite from Atrina rigida, Paracentrotus lividus and Heterocentrotus mommillatus have been soaked in phosphate solution with different concentrations and pHs for 2 months. X-ray powder diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy have been used to characterize soaking precipitates. The results show that the conversion of calcite to hydroxyapatite occurs to an extent which depends on composition and morphology of seed crystals, and starting concentration and pH of phosphate solutions. In the same experimental conditions, synthetic calcite single crystals did not convert to hydroxyapatite. The morphological observations suggest for hydroxyapatite formation, a mechanism that involves a superficial dissolution of calcite and a subsequently overgrowth of hydroxyapatite. Moreover, the final architectural assembly of the hydroxyapatite crystals resembles the shape of the starting biogenic seed crystals. (C) 2009 Elsevier B.V. All rights reserved.
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