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Thermal and ultrasonic influence in the formation of nanometer scale hydroxyapatite bio-ceramic

Poinern, G.E.J., Brundavanam, R.K., Le, X.T., Djordjevic, S., Prokic, M. and Fawcett, D. (2011) Thermal and ultrasonic influence in the formation of nanometer scale hydroxyapatite bio-ceramic. International Journal of Nanomedicine (6). pp. 2083-2095.

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Abstract

Hydroxyapatite (HAP) is a widely used biocompatible ceramic in many biomedical applications and devices. Currently nanometer-scale forms of HAP are being intensely investigated due to their close similarity to the inorganic mineral component of the natural bone matrix. In this study nano-HAP was prepared via a wet precipitation method using Ca(NO3)2 and KH2PO4 as the main reactants and NH4OH as the precipitator under ultrasonic irradiation. The Ca/P ratio was set at 1.67 and the pH was maintained at 9 during the synthesis process. The influence of the thermal treatment was investigated by using two thermal treatment processes to produce ultrafine nano-HAP powders. In the first heat treatment, a conventional radiant tube furnace was used to produce nano-particles with an average size of approximately 30 nm in diameter, while the second thermal treatment used a microwave-based technique to produce particles with an average diameter of 36 nm. The crystalline structure and morphology of all nanoparticle powders produced were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR). Both thermal techniques effectively produced ultrafine powders with similar crystalline structure, morphology and particle sizes.

Item Type: Journal Article
Murdoch Affiliation: School of Engineering and Energy
Publisher: Dove Press
Copyright: © 2011 Poinern et al
URI: http://researchrepository.murdoch.edu.au/id/eprint/6159
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