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Biocompatible whiskers with controlled morphology and stoichiometry

Published online by Cambridge University Press:  03 March 2011

Wojciech Suchanek
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226 Japan
Hiroyuki Suda*
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226 Japan
Masatomo Yashima
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226 Japan
Masato Kakihana
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226 Japan
Masahiro Yoshimura
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226 Japan
*
a)Present address: National Institute of Materials and Chemical Research, 1-1 Higasaki, Tsukuba 305, Japan.
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Abstract

Hydroxyapatite whiskers have been prepared by the hydrothermal method. The crystals had diameter, length, and aspect ratio in the range of 1–10 μm, 30–50 μm, and 5–20, respectively. Their Ca/P molar ratio varied from 1.59 to 1.62. The morphology of the crystals can easily be controlled by the concentrations of species in the starting solution, while the Ca/P ratio is almost independent of them. Through the reaction with calcite powder at 600 °C, the Ca/P ratio of the whiskers has been improved even to the stoichiometric value of 1.67. Taking into account morphology and chemical composition of the HAp whiskers, they should not be health hazardous and may find applications as substitutes for asbestos and other fibrous materials which presently have restricted use because of their carcinogenic natures.

Information

Type
Environmentally Benign Materials and Processes
Copyright
Copyright © Materials Research Society 1995

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