Synthesis, characterization, and dispersion properties of hydroxyapatite prepared by mechanochemical-hydrothermal methods

Chen, Chun-Wei and Oakes, Charles S. and Byrappa, K. and Riman, Richard E. and Brown, Kelly and TenHuisen, Kevor S. and Janas, Victor F. (2004) Synthesis, characterization, and dispersion properties of hydroxyapatite prepared by mechanochemical-hydrothermal methods. Journal of Materials Chemistry, 14 (15). pp. 2425-2432. ISSN 0959-9428

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Official URL: http://dx.doi.org/10.1039/B315095J

Abstract

Thermodynamic modeling was utilized to identify reaction conditions to prepare phase-pure hydroxyapatite particulates (HA) by mechanochemical-hydrothermal (M-H) methods using Ca(OH) and (NH)HPO as precursors. The resulting HA powders were characterized by X-ray diffraction, infra-red spectroscopy, thermogravimetry, and transmission electron microscopy, nitrogen adsorption and dynamic light scattering methods. Choosing reaction conditions in the 99% yield region of the CaO-PO-NHOH-HO phase-pure equilibrium system, nearly stoichiometric and nanostructured HA powders were prepared at room temperature in as little as 1 h. The minimum time to obtain phase-pure HA was 8 h from the conventional attrition mill. As-prepared powders were found to be highly agglomerated with a mass-weighted mean diameter of 2.6 [small micro]m in deionized water and average agglomeration number (AAN) as high as 4.5 [times] 10. Dispersion studies revealed that the appropriate use of dispersants could reduce the mass-weighted mean diameter and AAN. In the presence of sodium polyacrylate, the mass-weighted mean diameter and AAN were 217 nm and 1600, respectively.

Item Type: Article
Additional Information: Unmapped bibliographic data: M3 - 10.1039/B315095J [Field not mapped to EPrints] JO - J. Mater. Chem. [Field not mapped to EPrints]
Subjects: Physical Sciences > Earth Science
Divisions: PG Campuses > Manasagangotri, Mysore > Earth Science
Depositing User: Ambika P Patil
Date Deposited: 31 Jul 2013 06:35
Last Modified: 28 Oct 2015 11:21
URI: http://eprints.uni-mysore.ac.in/id/eprint/14383

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