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10 October 2012 Synthesis and characterization of porous nanocrystalline biphasic calcium phosphate for bio applications
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Abstract
The nano crystalline biphasic calcium phosphates of hydroxyapatite (HAp)/β-tricalcium phosphate (β-TCp) in the ratio 80:20 and 72:28 with interconnected porosity have successfully been prepared by co-precipitation method using mixed catanionic surfactants as template. The sample was calcinated at various temperatures for 8 h. The samples were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, Field emission scanning electron microscopy (FESEM) and thermal analyser. The samples calcinated at 750°C and 850°C show 75% and 89% of crystallinity respectively. Usually to obtain the biphasic calcium phosphates, either the medium will be set as acidic by altering the pH or the Ca/P ratio can be set below the value of 1.5. However this experiment was neither conducted with low Ca/P ratio (≤1.5) nor at low pH (≤7) to obtain the mixed phase. The combination of surfactants and calcination temperature controls the HAp/β-TCp ratio.
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P. Michael S. L. Shanthi, M. Ashok, and T. Balasubramanian "Synthesis and characterization of porous nanocrystalline biphasic calcium phosphate for bio applications", Proc. SPIE 8464, Nanobiosystems: Processing, Characterization, and Applications V, 846411 (10 October 2012); https://doi.org/10.1117/12.930449
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