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Synthesis of calcium phosphate crystals in a silica hydrogel containing phosphate ions

Published online by Cambridge University Press:  31 January 2011

Taishi Yokoi ,
Masakazu Kawashita ,
Giichiro Kawachi ,
Koichi Kikuta  and
Chikara Ohtsuki
Taishi Yokoi*
Affiliation:
Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Masakazu Kawashita
Affiliation:
Department of Biomedical Engineering, Graduate School of Biomedical Engineering, Tohoku University, Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan
Chikara Ohtsuki
Affiliation:
Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
*
a) Address all correspondence to this author. e-mail: yokoi.taishi@a.mbox.nagoya-u.ac.jp
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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

Biomimetic (chemical reaction)CeramicCrystal growth
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 6 , June 2009 , pp. 2154 - 2160
Copyright
Copyright © Materials Research Society 2009

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