abstract
The ceramics in the system CaO-MgO-SiO2 has recently received a great deal of attention because they exhibit good in vitro bioactivity and have potential use as bone implants. Biphasic calcium-magnesium-silicate ceramics was prepared by a sol-gel method. The dried gel with chemical composition 3CaO.MgO.2SiO(2) was thermally treated at 1300 degrees C for 2 h. The structural behavior of the synthesized ceramics was examined by means of X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Merwinite, as the main crystalline phase, and akermanite, as the minor phase, were identified. The in vitro bioactivity of the synthesized ceramic samples was recorded in Simulated Body Fluid (SBF) for different times of soaking. The apatite formation on the surface of the immersed samples was detected by FTIR, SEM and Energy Dispersive Spectroscopy (EDS) techniques. The ion concentrations in the SBF solutions after the in vitro test were evaluated by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). On the basis of the results obtained, the ability of the biphasic ceramics to deposit apatite layer was found. The peculiarities of the formation of apatite layer depending on the phase composition were analyzed and discussed.
keywords
GLASS-CERAMICS; SOL-GEL; BIOMEDICAL APPLICATIONS; FT-IR; SYSTEM; HYDROXYAPATITE; BIOCERAMICS; CARBONATE; DEGRADABILITY; SPECTROSCOPY
subject category
Chemistry
authors
Mihailova, IK; Radev, L; Aleksandrova, VA; Colova, IV; Salvado, IMM; Fernandes, MHV
our authors
Isabel Margarida Miranda Salvado
Associate Professor
Maria Helena Figueira Vaz Fernandes
Retired Professoracknowledgements
This work was funded by University of Chemical Technology and Metallurgy - Sofia, Bulgaria through research projects No 11308 and No 11167.