Spectroscopic characterization of porous nanohydroxyapatite synthesized by a novel amino acid soft solution freezing method.

In this paper, we have reported a novel method to synthesize nanoporous hydroxyapatite (HAP) powders by freezing organic-inorganic soft solutions. The formation of porous and crystalline HAP nanopowder was achieved via calcining the samples at 600 degrees C followed by sintering at temperatures ranging from 900 degrees C to 1100 degrees C. The samples were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopic (SEM) techniques.

Spectroscopic investigations of nanohydroxyapatite powders synthesized by conventional and ultrasonic coupled sol-gel routes.

In the present work, the synthesis and characterization of nano-HAP powders by a novel ultrasonic coupled sol-gel synthesis is reported. The obtained powders were sintered by conventional means at different temperatures. In addition to this, HAP powders prepared through the sol-gel method without the aid of the ultrasonic waves is also studied.