A comparative study: Hydroxyapatite spherical nanopowders and elongated nanorods

Low temperature wet-chemical method was employed for the synthesis of different grades of hydroxyapatite (HAp) nanoparticles. The elongated nanorods (ENRs) exhibited more crystallinity, higher specific surface area at room temperature but decomposed at low temperature compared to spherical nanopowders (SNPs). Choice of starting precursors and pH of reaction media were the key factors in the formation of these particles. Distinct sintering characteristics and microstructure were noticed because of the difference in thermal stability, pore curing and grain growth.