4 years ago

Influence of network modifiers in an acetate based sol-gel bioactive glass system

Influence of network modifiers in an acetate based sol-gel bioactive glass system
The aim of this study was to assess the influence of CaO/Na2O ratio on the structural and textural properties of mesoporous bioactive glasses generated from an acetic acid catalysed acetate based sol-gel system. The glass network formers (SiO2 and P2O5) were fixed and the network modifiers were varied [75SiO2:XCaO:(15-X)Na2O:10P2O5 where X = 5, 10, 15, in mole percent] such that increasing alkaline earth oxide is compensated by decreasing alkali oxide. The glass properties were assessed using techniques such as XRF, XRD, FTIR, BET/BJH, SEM, TEM and ICP. The rapid gelling of the sol resulted in the deposition of the calcium and sodium acetate precursors on the particle surface which required thermal treatment to facilitate their entry into the glass network. The results of our study demonstrated that the porosity was clearly driven by CaO in the composition possibly due to its inferior fluxing effect in comparison to Na2O. The sample with highest CaO content reached a high surface area and pore volume (535 m2 g−1 and 0.33 cm3 g−1) even in a non-surfactant based preparation suggesting that acetic acid catalysed acetate system favours improved textural properties. In vitro SBF tests confirmed the potential of the sample with highest CaO for earlier apatite formation.

Publisher URL: www.sciencedirect.com/science

DOI: S1387181117305656

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