Journal of the Ceramic Society of Japan
Online ISSN : 1882-1022
Print ISSN : 0914-5400
ISSN-L : 0914-5400
Special Issue ''Innovative Ceramics (I)'': Notes
In-Situ IR Spectral Measurement in Organic Matrix-Mediated Hydroxyapatite Formation
Kimiyasu SATOYuri KUMAGAIToshiyuki IKOMAKoji WATARIJunzo TANAKA
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2005 Volume 113 Issue 1313 Pages 112-115

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Abstract

Organic template-directed crystallization of hydroxyapatite (HAp) was studied in-situ via Fourier transform IR external reflection spectroscopy. Langmuir monolayer of arachidic acid was formed on a surface of simulated body fluid, which possesses inorganic ion concentrations and a pH value almost equal to those of human blood plasma. Owing to the chemical interactions between inorganic ions and carboxyl groups, heterogeneous nucleation of HAp occurred below the monolayer. The absorbances of the antisymmetric and symmetric methylene stretching bands in the IR spectra varied during the nucleation process, which means that conformational change of hydrocarbon chain occurred. Interfacial interactions between organic templates and induced crystals are often discussed only through static experimental models. However, the organic matrices should also be treated as elastic template and their structural changes due to the formation of HAp crystals should be recognized, when the biomineralization mechanism is discussed.

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© 2005 The Ceramic Society of Japan
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