Structural characterization of sol-gel derived bioactive glasses containing silver.

Reference Presenter Authors
02-072 Akiko Moura Hanasiro de Queiroz, A.P.(Federal University of ABC); Zambanini, T.(Federal University of Abc); Hanasiro, A.M.(Federal University of Abc); Borges, R.(Federal University of Abc); Schneider, J.F.(Instituto de Física de São Carlos); Marchi, J.(Federal University of Abc); Bioactive glasses are considered effective materials for bone tissue regeneration. Considering the huge number of infections related to implants and surgeries procedures, it turns interesting to ally antimicrobial properties to bioactive glasses, such as by adding silver as bactericidal agent. In this work, AgO (1%, 5% and 10 wt %) were incorporated into SiO2-CaO-P2O5 system via sol-gel synthesis. The powders were then lyophilized and calcined at 550°C. The studied materials were structurally characterized through differential thermal analysis (DTA), thermogravimetric analysis (TGA), x-ray diffraction (XRD), Fouriertransform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), 29Si nuclear magnetic resonance spectroscopy (29Si-NMR) and X-ray photoelectron spectroscopy (XPS). The results evidenced that up to 5 wt.% of AgO in the glass matrix, only Ag+ species were observed, while both Ag+ and Ag0 are observed for compositions containing higher amounts of AgO. Ag0 species were found as metallic nanoparticles dispersed in the glass matrix. The overall results emphasize that it is possible to obtain bioactive glass with different species of silver only by controlling the amount of AgO in the glass structure. The possibility of producing glasses with different silver species may help to further insights about whether Ag+ or Ag0 species may be more effective for bactericidal purpose, which still is an open question in the field of biomaterials.
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