Absorption Spectra and Bioactivity Behavior of Gamma Irradiated CeO2-Doped Bioglasses

• Published in: SILICON Vol. 5; no. 2; pp. 171 - 181
• Main Authors: El-Batal, Fatma H., El-Kheshen, Amany A., Hamdy, Yousry M.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.04.2013; Springer Nature B.V
• Subjects: Absorption spectra; Bioglass; Biological activity; Biomedical materials; Body fluids; Calcium phosphates; Cerium oxides; Chemistry; Chemistry and Materials Science; Electron paramagnetic resonance; Electron spin; Environmental Chemistry; Gamma irradiation; Inorganic Chemistry; Lasers; Materials Science; Optical Devices; Optics; Original Paper; Photonics; Polymer Sciences; Radiation effects; Spin resonance; Surface layers; Absorption spectroscopy; CeO; ESR; IR spectroscopy; Bioglass
• ISSN: 1876-990X; 1876-9918
• DOI: 10.1007/s12633-012-9112-4

The synthesis and characterization of some bioglasses based on Hench’s Bioglass® 45S5 with additions of CeO 2 (1.0, 2.0, or 3.0%) have been carried out. Two objectives have been focused upon; first, the effect of successive ionizing gamma irradiation on the undoped and CeO 2 -doped bioglass samples has been evaluated with the aim of justifying the role of the rare earth oxide CeO 2 on gamma irradiation. The second objective was directed to test the bioactivity of such prepared CeO 2 -doped samples after soaking for 1 month in a simulated body fluid at 37 °C. The results indicate that the additions of CeO 2 suppress, to a marked extent, the generation of radiation induced defects especially in the visible region. The bioactivity results show that the studied CeO 2 -doped bioglass samples gave rise to a calcium phosphate surface layer upon immersion in a simulated body fluid for 1 month at 37 °C and the bioactivity extent was almost identical in the CeO 2 doping interval limit (1 → 3% CeO 2 ) to that of the undoped base Hench’s Bioglass. The presence of both Ce 3+ and Ce 4+ ions were confirmed by optical absorption spectra. Electron spin resonance (ESR) studies of gamma irradiated CeO 2 -doped glasses indicate and confirm the dominance of Ce 4+ in the bioglass compositions and its transformation to Ce 3+ by high gamma irradiation.