Apatite hydrogel and its caking behavior

Apatite hydrogel preparation and its caking behavior was studied. Di-sodium hydrogen phosphate dodeca-hydrate and calcium chloride di-hydrate was dissolved in distilled water, and pH was adjusted to 7.40. The mixed solution was kept at room temperature for 1-21 days in air or N2 atmosphere. With mat...

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Bibliographic Details
Published in:Key engineering materials 2004-01, Vol.254-256, p.63-66
Main Authors: Yokogawa, Y, Shiotsu, Y, Nagata, F, Watanabe, M
Format: Article
Language:English
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Summary:Apatite hydrogel preparation and its caking behavior was studied. Di-sodium hydrogen phosphate dodeca-hydrate and calcium chloride di-hydrate was dissolved in distilled water, and pH was adjusted to 7.40. The mixed solution was kept at room temperature for 1-21 days in air or N2 atmosphere. With maturation period, the particle size of apatite hydrogel decreased in air, but increased in N2. The FT-IR absorbance ratio (CO3-band/PO4-band) of the apatite hydrogel prepared in air increased, but those in N2 decreased. TEM observation revealed that the crystal size of the apatite hydrogel seems to be almost similar, independent of the maturation period and atmospheric condition. So carbonate ion in apatite hydrogel is believed to strongly affect the aggregate of particles The caking behavior of apatite hydrogel depended on the relative humidity, and the particle size. At 40-60% of relative humidity, the contraction of apatite hydrogel in volume was completed for 2 days, and the specimen set firm, stable in aqueous solution.
ISSN:1013-9826