Particle size and shape modification of hydroxyapatite nanostructures synthesized via a complexing agent-assisted route

چکیده مقاله

In this work, hydroxyapatite (HAP), Ca10(PO4)6(OH)2, nanostructures including nanorods, nanobundles and nanoparticles have been prepared via a simple precipitation method. In the present method, Ca(NO3)2·4H2O and (NH4)2HPO4were used as calcium and phosphorus precursors, respectively. Besides, the Schiff bases derived from2-hydroxyacetophenone and different diamineswere used as complexing agents for the in situ formation of Ca2+ complexes. The formation mechanism of 0-D and 1-D nanostructures of HAP was also considered. When the complexing agents could coordinate to the Ca2+ ions through N and O atoms to form the [CaN2O2]2+ complexes, HAP nanoparticles were generated. On the other hand, nanorods and nanobundles of HAP were obtained by forming the [CaN2]2+ as well as [CaO2]2+ complexes in the reaction solution. This work is the first successful synthesis of pure HAP nanostructures in the presence of Schiff bases instead of using the common surfactants.