Effects of Monocarboxylic Acid Addition on Crystallization of Calcium Phosphate in a Hydrogel Matrix

In biomineralization, it is thought that water-soluble organic substances control crystal growth of minerals in hard tissues. The roles of organic substances are not well understood, because the biomineralization process is established by complicated parameters. Crystal growth in hydrogel matrixes c...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2011, Vol.18 (19), p.1-4
Main Authors: Yokoi, T, Kawashita, M, Ohtsuki, C
Format: Article
Language:English
Subjects:
Biomineralization
Calcium ions
Calcium phosphate
Calcium phosphates
Composing
Crystal growth
Crystal morphology
Crystal structure
Crystallinity
Crystallization
Crystals
Hydrogels
Morphology
Precipitates
Propionic acid
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Summary:In biomineralization, it is thought that water-soluble organic substances control crystal growth of minerals in hard tissues. The roles of organic substances are not well understood, because the biomineralization process is established by complicated parameters. Crystal growth in hydrogel matrixes can be regarded as simplified model system of biomineralization. In the present study, we investigated the effects of propionic acid (Pro) on crystalline phases and crystal morphologies of calcium phosphate formed in polymeric hydrogel matrixes as the model system of biomineralization. Crystalline phase of the precipitates was octacalcium phosphate (OCP) with spherical shape regardless of Pro concentrations. The fibrous crystals formed under the condition without addition of Pro. The crystal morphologies composing spherical crystals were changed from fibrous to plate-like shape with increasing Pro concentrations. Generally, OCP crystal has plate-like shape exposing (100) face, which calcium ions exist on. Therefore, crystal growth rate of [100] direction of OCP was decreased by Pro adsorbed on (100) face. As a result, crystal morphology composing spherulite became plate-like shape with increasing Pro concentrations.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/18/19/192012