Nanocrystalline hydroxyapatite bioceramic using microwave radiation: Synthesis and characterization

    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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