Microwave energy-assisted formation of bioactive CaO�?�MgO�?�SiO$_2$ ternary glass from bio-wastes

[摘要] Regeneration technique is extensively being sought after as a means of achieving bone repair without adverse immunological response. Silicate-based bioactive glasses containing Mg are gaining increasing attention for their biocompatibility. The current work has been focused on designing a facile and economic route using bio-wastes for synthesizing bioactive glasses in the CaOâ€�?�MgOâ€�?�SiO$_2$ system. Rice husk ash (RHA) obtained from burning ricehusk was used as silica source, while Ca was extracted from eggshells for preparing the glass through a modified solâ€�?�gel approach. The gel formed was irradiated in microwave before sintering at 950$^{circ}$C for 3 h. Thereafter, bioactivity test was conducted on the samples in simulated body fluid (SBF) at physiological conditions for a maximum of 14 days. Characterization of samples were performed before and after immersion in SBF to evaluate thecomposition, morphology and phases present in the glass using energy-dispersive X-ray analysis, scanning electron microscopy and X-ray diffraction. Apatite formation was confirmed using Fourier transform infrared spectroscopy.Results obtained showed the presence of diopside, wollastonite and pseudo-wollastonite as major bioactive phases. Hydroxyapatite formed on the material within 3 days in SBF, indicating good bioactivity.

[学科分类] 材料工程

[关键词] Rice husk ash;diopside;wollastonite;pseudo-wollastonite;hydroxyapatite.