Nano Archive

Evaluation and characterization of nanostructure hydroxyapatite powder prepared by simple sol-gel method

Fathi, M. H. and Hanifi, A (2007) Evaluation and characterization of nanostructure hydroxyapatite powder prepared by simple sol-gel method. Materials Letters, 61 (18). 3978 - 3983.

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Many attempts have been focused on preparing of synthetic hydroxyapatite (HA), which closely resembles bone apatite and exhibits excellent osteoconductivity. Low temperature formation and fusion of the apatite crystals have been the main contributions of the sol–gel process in comparison with conventional methods for HA powder synthesis. This paper describes the synthesis of nano-HA particles via a sol–gel method. Nanocrystalline powder of hydroxyapatite (HA) was prepared using Ca(NO3)2·4H2O and P2O5 by a simple sol–gel approach. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used for characterization and evaluation of the phase composition, morphology and particle size of products. The presence of amorphous and crystalline phases in the as-dried gel precursor was confirmed by the evaluating technique. Single phase of HA was also identified in the heat treated powder by XRD patterns. SEM and TEM evaluations showed that the obtained powder after heat treatment at 600 °C was agglomerated and composed of nanocrystalline (25–28 nm) HA particles. Increasing the sintering temperature and time could cause decomposition of HA into β-tricalcium phosphate and calcium oxide. The prepared nanocrystalline HA is able to improve the contact reaction and the stability at the artificial/natural bone interface for medical applications.

Item Type:Article
Uncontrolled Keywords:Hydroxyapatite; Sol–gel technique; Hydroxyapatite nanocrystalline powder
Subjects:Material Science > Bio materials
Material Science > Nanostructured materials
ID Code:6713
Deposited By:SPI
Deposited On:09 Feb 2010 12:33
Last Modified:09 Feb 2010 12:33

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