Preparation of Mg–Zn bimetallic doped Na-containing bioceramic from sodium metasilicate
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Essien, E. R.
Glass–ceramic materials in the composition (mol%) 23.5 Na2O–23.5CaO–xMgO–xZnO–47SiO2–(6-2x) P2O5 (x = 0 and 1.5) were prepared by the sol–gel technique using sodium metasilicate (Na2SiO3) as source of Na2O and SiO2. Bioactivity was investigated in vitro by examining apatite formation on the surface of the samples after treatment in acellular simulated body fluid (SBF). Formation of bioactive apatite layer on the samples was confirmed by using scanning electron microscope, X-ray diffraction and Fourier transform infrared spectroscopy. Reactivity of the materials in SBF was based on changes in pH and ionic concentration of the solution as a function of immersion duration. Results obtained indicated that the sample doped with Mg and Zn exhibited greater crystallinity containing phases such as CaMgSi2O6, Ca2MgSi2O7, CaSiO3, Na2CaSi3O9, Na2CaSi3O8, CaZnSi2O7 and a new secondary phase, clinohedrite (CaZnSiO4H2O), while the undoped sample contained a single crystalline phase composed of Na2Ca2Si3O9. After 7 days in SBF, phase transformation occurred at different rates on the materials leading to formation of apatite layer. The result shows that controlled amounts of MgO and ZnO may be useful in tuning up the mechanical properties of bioactive glasses while maintaining bioactivity.
Sol–gel process , Sodium metasilicate , Magnesium , Zinc , Bioceramics
Essien, E. R., & Adams, L. A. (2016). Preparation of Mg–Zn bimetallic doped Na-containing bioceramic from sodium metasilicate. Journal of Porous Materials, 23(4), 885-893.