Preparation of thermally stable nanocrystalline hydroxyapatite by hydrothermal method
Thermally stable hydroxyapatite (HAp) was synthesized by hydrothermal method in the presence of malic acid. X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), Raman spectroscopy, scanning electron microscopy (SEM), differential thermal analysis (DTA), thermogravimetric analysis (TGA) was done on the synthesized powders. These analyses confirmed the sample to be free from impurities and other phases of calcium phosphates, and were of rhombus morphology along with nanosized particles. IR and Raman analyses indicated the adsorption of malic acid on HAp. Thermal stability of the synthesized HAp was confirmed by DTA and TGA. The synthesized powders were thermally stable upto 1,400°C and showed no phase change. The proposed method might be useful for producing thermally stable HAp which is a necessity for high temperature coating applications.
KeywordsMalic Acid Simulated Body Fluid Dicalcium Phosphate Dihydrate Stable Upto Synthetic Calcium Phosphate
The authors acknowledge the grant from Department of Science and Technology, New Delhi through Research Project No. SR/SO/HS-05/2005.
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