Title

Nanocrystalline hydroxyapatite bioceramic using microwave radiation: Synthesis and characterization

Authors

Authors

S. J. Kalita;S. Verma

Comments

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Abbreviated Journal Title

Mater. Sci. Eng. C-Mater. Biol. Appl.

Keywords

Nanocrystalline hydroxyapatite; Nano-powder; Microwave radiation; Calcium phosphate; Biomaterial; CALCIUM-PHOSPHATE CERAMICS; IN-SITU SYNTHESIS; THERMAL-DECOMPOSITION; LOW-TEMPERATURE; RAPID FORMATION; IRRADIATION; POWDERS; PARTICLES; STABILITY; COATINGS; Materials Science, Biomaterials

Abstract

In this work, we synthesized bioactive hydroxyapatite (Ca-10(PO4)(6)(OH)(2), HAp) ceramic powder in the lower-end of nano-regime using microwave radiation, which offers several advantages. The powder was synthesized using calcium nitrate tetrahydrate and sodium phosphate dibasic anhydrous as the starting materials. EDTA served as the complex reagent. The pH of the final suspension was adjusted to 9 by adding ammonium hydroxide. Applied microwave power of 600 W. pH of the suspension, mole ratio of Ca/P in the staring chemicals, and the chelating effect of EDTA served as the factors in the synthesis of nanocrystalline HAp powder. The synthesized powder was studied using various characterizing techniques viz., XRD, SEM, HR-TEM, EDS, TG/DTA and FT-IR to determine powder morphology, particle-size, crystallinity, phases, elemental composition and thermal behavior. Results confirmed highly crystalline nano-powder (5-30 nm) with elemental composition of Ca and P in HAp phase and possessed mixed (elliptical and rod-shape) morphology. Using the Scherrer formula, the average crystallite size was found to be 12 nm. The FT-IR confirmed that the powder is of typical apatite structure. Thermal analysis showed a remarkably lower initial dehydroxylation temperature, compared to micron sized HAp, as reported in literature. (C) 2009 Elsevier B.V. All rights reserved.

Journal Title

Materials Science & Engineering C-Materials for Biological Applications

Volume

30

Issue/Number

2

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

295

Last Page

303

WOS Identifier

WOS:000274081600010

ISSN

0928-4931

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