TY - JOUR
T1 - Synthesis of calcium phosphate crystals in a silica hydrogel containing phosphate ions
AU - Yokoi, Taishi
AU - Kawashita, Masakazu
AU - Kawachi, Giichiro
AU - Kikuta, Koichi
AU - Ohtsuki, Chikara
N1 - Funding Information:
One of the authors, C. Ohtsuki, appreciates the financial support received from the Daiko Foundation, Nagoya, Japan.
PY - 2009/6
Y1 - 2009/6
N2 - Calcium phosphate crystals were synthesized by diffusing calcium ions into silica hydrogels containing phosphate ions. Hydroxyapatite [HAp, Ca 10(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 changes in crystal morphology of the HAp and OCP were ascribed to the degree of supersaturation of the reaction environment and the rate-determining step in the HAp and OCP crystal growth mechanism.
AB - Calcium phosphate crystals were synthesized by diffusing calcium ions into silica hydrogels containing phosphate ions. Hydroxyapatite [HAp, Ca 10(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 changes in crystal morphology of the HAp and OCP were ascribed to the degree of supersaturation of the reaction environment and the rate-determining step in the HAp and OCP crystal growth mechanism.
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U2 - 10.1557/jmr.2009.0242
DO - 10.1557/jmr.2009.0242
M3 - Article
AN - SCOPUS:68149141349
SN - 0884-2914
VL - 24
SP - 2154
EP - 2160
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 6
ER -