Synthesis of calcium phosphate crystals in a silica hydrogel containing phosphate ions
- 1 June 2009
- journal article
- Published by Springer Science and Business Media LLC in Journal of Materials Research
- Vol. 24 (6), 2154-2160
- https://doi.org/10.1557/jmr.2009.0242
Abstract
Calcium phosphate crystals were synthesized by diffusing calcium ions into silica hydrogels containing phosphate ions. Hydroxyapatite [HAp, Ca10(PO4)6(OH)2] and octacalcium phosphate [OCP, Ca8(HPO4)2(PO4)4.5H2O] with different types of crystal morphology were formed in the gel. The HAp had an irregular or rod shape, a few micrometers in length, while the OCP had an irregular, spherulite, rod- or ribbonlike shape, ranging in size from a few micrometers to several tens of micrometers, depending on the amount of phosphoric acid added and the reaction temperature. The morphology of the OCP changed from an irregular shape to a ribbonlike or rod shape, via a spherulite shape, depending on the amount of phosphoric acid added and the reaction temperature. The degree of supersaturation of the reaction environment and the rate-determining step in the HAp and OCP crystal growth mechanism have been ascribed to the changes in crystal morphology of the HAp and OCP.Keywords
This publication has 14 references indexed in Scilit:
- A Biomimetic Approach for Hierarchically Structured Inorganic Crystals through Self-OrganizationBulletin of the Chemical Society of Japan, 2006
- Effects of temperature on growth and aggregation of calcium oxalate in presence of various carboxylic acids in silica gel systemsMaterials Science and Engineering: C, 2006
- Preparation of hierarchically organized calcium phosphate–organic polymer composites by calcification of hydrogelScience and Technology of Advanced Materials, 2006
- The morphology of calcite crystals grown in a porous medium doped with divalent cationsChemical Geology, 2005
- Phase formation and morphology of calcium phosphate–gelatine-composites grown by double diffusion technique: the influence of fluorideJournal of Materials Chemistry, 2004
- Biomimetic nucleation and growth of CaCO3 in hydrogels incorporating carboxylate groupsBiomaterials, 2004
- Synthesis of a new hydroxyapatite-silica composite materialJournal of Crystal Growth, 2000
- Mechanism of apatite formation on CaO SiO2P2O5 glasses in a simulated body fluidJournal of Non-Crystalline Solids, 1992
- Kinetics of crystallization of octacalcium phosphateThe Journal of Physical Chemistry, 1984
- Crystal growth in gelsJournal of Physics and Chemistry of Solids, 1965