A quick sol-gel process to elaborate a high bioactive ceramic powder

Tóm tắt

A bioactive ceramic powder containing 45% SiO2, 24.5% CaO, 24.5% Na2O and 6% P2O5 (wt%) has been synthesized by a quick sol-gel process. Resulting material was investigated by several physico-chemical methods. The X-ray diffraction showed the presence of two crystalline phases, Na6Ca3Si6O18 and NaCaPO4, in the structure of ceramic powder. The specific surface area and porosity were determined using the Brunauer – Emmet – Teller (BET) technique based on N2 gas absorption-desorption. ‘‘In vitro’’ experiments were carried out by soaking the powder samples in simulated body fluid (SBF) at different times. X-ray diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) coupled with Energy Dispersive X-ray Spectroscopy (EDS) were used for the ‘‘in vitro’’ evaluation of the bioactivity. The obtained results confirmed that the ceramic powder can be used as biomaterial for bone tissue engineering due to its high bioactivity expressed by the rapid formation of a biological carbonated hydroxyapatite layer on its surface after ‘‘in vitro’’ assay.