Journal of Nanomedicine & Nanotechnology

Nanocrystalline hydroxyapatite-phosphonate composites

9^th Nano Congress for Next Generation

August 01-02, 2016 Manchester, UK

Debbabi Mongi

University of Monastir, Tunisia

Posters & Accepted Abstracts: J Nanomed Nanotechnol

Abstract:

Two new hybrid compounds apatite-phosphonate are prepared by hydrothermal method. For that, vinyl or methyl phosphonic acid variable quantity is added during apatite synthesis. X-ray diagrams confirmed the apatite structure conservation and permitted to evaluate crystallite sizes. The values are in nanometric range (25 - 2.5 nm). IR and Raman spectroscopy showed apatite characteristic bands and also phosphonate bands. 31P MAS-NMR spectra present the apatite isotropic signal and new signals attributed to phosphonate organic phosphor. 13C MAS-NMR reveals vinyl or methyl characteristic signals. Thermo gravimetric analysis shows a weight loss between 200 and 600°C attributed to the organic moiety decomposition. Differential thermal analysis (DTA) confirms the exothermic effect. The value of this loss increases with the increase of grafting, in good agreement with the results of the 13C chemical analysis. Specific area measurements show obtaining porous hybrid apatite-phosphonate compounds whose porosity is controlled by the rate and the nature of the graft. The observation by Transmission Electron Microscopy (TEM) and Atomic-force microscopy (AFM) powders of these new materials shows that the crystallite size is in the nanometer scale and decreases with the amount of graft added during synthesis.

Biography :

Email: m.debbabi@yahoo.fr