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Effect of Ammonium Carbonate on Formation of Calcium-Deficient Hydroxyapatite Through Double-Step Hydrothermal Processing

Effect of Ammonium Carbonate on Formation of Calcium-Deficient Hydroxyapatite Through Double-Step Hydrothermal Processing

S Prakash Parthiban, Ill Yong Kim, Koichi Kikuta, Chikara Ohtsuki

J Mater Sci Mater Med. 2011 Feb;22(2):209-16.

PMID: 21153686

Abstract:

Double-step hydrothermal processing is a process where powder compacts of calcium phosphates are exposed to vapor of solvent solution, followed by being immersed in the solution. In the present study, we investigated the effects of ammonium carbonate on formation of calcium-deficient hydroxyapatite (CDHA) through double-step hydrothermal processing. The synthesized CDHA has high crystallinity when the solution has relatively low concentration of the ammonium carbonate ranging from 0.01 to 0.25 mol dm(-3). Carbonate content in the prepared samples were distinctly increased with increasing the concentration of ammonium carbonate to indicate formation of carbonate-containing calcium-deficient hydroxyapatite (CHAp) with low crystallinity. Morphology of the CHAp formed on the compacts varied progressively from rods and rosette-like shape to irregular shape with increase in the initial concentration of the ammonium carbonate in the solution. Application of ammonium carbonate in the double-step hydrothermal processing allows fabrication of irregular-shaped CDHA containing carbonate ions in both phosphate and hydroxide site, with low crystallinity, when the initial concentration of ammonium carbonate was 0.5 mol dm(-3) and more.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP8000735	Ammonium carbonate		8000-73-5	Price

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