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Shape-Controlled Synthesis of Hydroxyapatite in Organic Media

Published online by Cambridge University Press:  10 February 2011

K. Sakamoto ,
A. Nakahira ,
M. Okazaki ,
J. Ichihara ,
M. Inoue  and
S. Yamaguchi
K. Sakamoto
Affiliation:
Department of Chemistry, Osaka Sangyo University, Nakagaito, Daito, Osaka 574-0013, Japan
A. Nakahira
Affiliation:
Kyoto Institute of Technology, Goshokaidocho, Matsugasaki, Sakyo-ku, Kyoto 606-0962, Japan
M. Okazaki
Affiliation:
Osaka University Faculty of Dentistry, Yamadaoka, Suita, Osaka 565-0871, Japan
J. Ichihara
Affiliation:
ISIR, Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
M. Inoue
Affiliation:
ISIR, Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
S. Yamaguchi
Affiliation:
ISIR, Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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Abstract

We have examined the effect of organic solvent on the microstructures of hydroxyapatite (HAp) formed by hydrolysis of α -tricalcium phosphate ( α -TCP) in heterogeneous solvent system (water-hydrophobic organic solvent). The shape of HAp was like ultrafine whisker (length : about 1 ∼- 4 µ m) and its size depended on the used organic solvent.

As a simple hybridization, incorporation of fluoride anion (F−) into HAp was attempted in similar system to obtain fluoridated apatite [Ca10(PO4)6(OH)2−x Fx.]. The formation rate was strongly affected by the concentration of F− and reaction temperature. Although the product in water (in the absence of organic solvent) consists of fine particles less than 1 µ m, the product prepared in the heterogeneous solvent system was mixture of ultrafine particles ( ∼ 0.1 µ m) and needle-like particles (length : about 1 ∼ 4 µ m, width : ∼ 0.5 µ m). The microstructures of HAp and FHAp were controlled by hydrophobicity of organic solvent.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 519: Symposium O – Organic/Inorganic Hybrid Materials , 1998 , 407
Copyright
Copyright © Materials Research Society 1998

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