Effects of catalysts on polymerization and microstructure of sol-gel derived bioglasses
authors Ben-Arfa, BAE; Fernandes, HR; Salvado, IMM; Ferreira, JMF; Pullar, RC
nationality International
journal JOURNAL OF THE AMERICAN CERAMIC SOCIETY
author keywords bioceramics; catalysts; catalysis; glass-ceramics; polymers; polymerization; sol-gel
keywords BIOACTIVE GLASSES; INFRARED-SPECTROSCOPY; NITRATE HYDRATE; HYDROLYSIS; TETRAETHOXYSILANE; SPECTRA; CALCIUM; SILICA; SYSTEM; CONDENSATION
abstract This work investigates the effects of the type and concentration of acid catalysts on the microstructural features of silica-rich bioactive glasses (75Si-16Ca-5Na-4P, in mol%) synthesized from acetate and nitrate precursor salts, using an innovative rapid sol-gel method, followed by thermal stabilization at 550 degrees C. The results of XRD, SEM, Fourier Transform Infrared Spectrometer (FTIR) and solid state MAS NMR analysis revealed that the lower degrees of polymerization and network connectivity were found for bioglass powders obtained in the presence of high acid concentrations. A low amount of citric acid gave a polymerization degree similar to that obtained in the absence of any catalyst, but the synthesis time was as short as that found for high acid concentrations. The XRD and FTIR results demonstrated amorphous glass powders free of any nitrate by-products. The microstructure and degree of polymerization could be modified by changing the type and concentration of acid catalyst, enabling one to tailor the bioactivity of glasses even without changing the starting composition.
publisher WILEY
issn 0002-7820
year published 2018
volume 101
issue 7
beginning page 2831
ending page 2839
digital object identifier (doi) 10.1111/jace.15450
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000431661300019
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  impact metrics
journal impact factor (jcr 2016): 2.841
5 year journal impact factor (jcr 2016): 2.884
category normalized journal impact factor percentile (jcr 2016): 90.385
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