Synthesis and Characterization of Thermally Stable Hydroxyapatite

Abstract

Nanocrystalline and thermally stable hydroxyapatite (HA) powder with nominal composition of Ca10(PO4)6(OH)2 was prepared by wet chemical route from calcium hydroxide Ca(OH)6 and mono ammonium phosphate NH4H2PO4 as calcium and phosphate sources, respectively. The effect of calcination temperature on the structure, microstructure, molecular bonding, thermal behavior and morphology was investigated by X-ray diffraction patterns (XRD), Fourier Transform Infra-Red (FT-IR), Raman spectroscopy, thermogravimetry (TGA), differential thermal analysis (DTA) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) analysis. The XRD patterns of the as-prepared and calcined powders exhibit a single phase of hydroxyapatite. The crystallite size of as-prepared and calcined HA is in the range of 44-182 nm. FT-IR and Raman spectroscopy results are in good agreement with XRD ones. The EDS analysis reveals the presence of all elements. The thermal stability of the synthesized powders is evidenced by TGA/DTA scans which show a weight loss smaller than 2%.

Ultralong hydroxyapatite nanofibers/organics composite film for improving its mechanical property: Effect of proportions

“…Compared to curves of composite products containing 50% and 60% UHANFs, the data of mixture with 70% and 80% UHANFs shows a gentler decline rate. The addition of UHANFs makes this process relatively stable for the superior thermal stability of HA, [ 45 ] which also improves the thermal stability of the composite material. The TGA helps to further understand the performance change and better control the safety and stability of the material when it is used at different temperatures.…”