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1 2010

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Synthesis and characterization of nanocrystalline hydroxyapatite obtained by the wet chemical technique

Eslami H., Solati-Hashjin M., Tahriri M., Bakhshi F.

Materials Science Poland

2010

Vol. 28, No. 1

5--13

Hydroxyapatite was synthesized by the wet chemical technique. Diammonium hydrogen phosphate and calcium nitrate 4-hydrate were used as starting materials and sodium hydroxide solution was used as the agent for pH adjustment. The powder sample was characterized by the commonly used bulk techniques of scanning electron microscopy (SEM), transmission electron microscopy, Fourier transform infra-red spectroscopy, differential thermal analysis, thermal gravimetric analysis, X-ray diffraction, atomic absorption spectroscopy and EDTA titration analyses. With respect to the results achieved from the above analyses, it was found that nanocrystalline hydroxyapatite can successfully be produced through the wet precipitation method. The bulk Ca/P molar ratio of synthesized hydroxyapatite was determined as 1.71, which was higher than the stoichiometric ratio (1.667) that is expected for a pure HA phase. SEM investigations revealed that, there is a distribution of small particles and large agglomerates consisting of fine particles cold welded together. Lastly, the TEM technique demonstrated that the crystallites of the prepared powder were nanosized and had a needle-like morphology. The aspect ratio of the crystallites was about 8.