Bioactivity of electro-thermally poled bioactive silicate glass
Boccaccini AR (2009)
Publication Type: Journal article
Publication year: 2009
Journal
Publisher: Elsevier
Pages Range: 1274-1283
Journal Issue: 5
DOI: 10.1016/j.actbio.2008.11.005
Abstract
A 45S5 bioactive glass (nominal composition: 46.1 mol.% SiO2, 2.6 mol.% P2O5, 26.9 mol.% CaO, 24.4 mol.% Na2O) was electrothermally poled by applying voltages up to 750 V for 45 min at 200 °C, and the thermally stimulated depolarization currents (TSDCs) were recorded. Changes in chemical composition and electrical properties after poling were investigated by TSDC measurements, impedance spectroscopy and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX). The poling led to the formation of interfacial layers underneath the surface in contact with the electrodes. Under the positive electrode, the layer was characterized by Na+ ion depletion and by a negative charge density, and the layer was more resistive than the bulk. The influence of poling on the bioactivity was studied by immersion of samples in simulated body fluid (SBF) with subsequent cross-sectional SEM/EDX and X-ray diffraction analysis. It was found that poling leads to morphological changes in the silica-rich layer and to changes in the growth rate of amorphous calcium phosphate and bone-like apatite on the glass surface. The bone-like apatite layer under the positive electrode was slightly thicker than that under the negative electrode. © 2008 Acta Materialia Inc.
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How to cite
APA:
Boccaccini, A.R. (2009). Bioactivity of electro-thermally poled bioactive silicate glass. Acta Biomaterialia, 5, 1274-1283. https://doi.org/10.1016/j.actbio.2008.11.005
MLA:
Boccaccini, Aldo R.. "Bioactivity of electro-thermally poled bioactive silicate glass." Acta Biomaterialia 5 (2009): 1274-1283.
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