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Effects of catalysts on polymerisation and microstructure of sol‐gel derived bioglasses


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%) synthesised from acetate and nitrate precursor salts, using an innovative rapid sol‐gel method, followed by thermal stabilisation at 550 °C. The results of XRD, SEM, FTIR and solid state MAS NMR analysis revealed that the lower degrees of polymerisation and network connectivity were found for bioglass powders obtained in the presence of high acid concentrations. A low amount of citric acid gave a polymerisation 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 polymerisation 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.

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Autoren:   Basam A. E. Ben‐Arfa, Hugo R. Fernandes, Isabel M. Miranda Salvado, José M. F. Ferreira, Robert C. Pullar
Journal:   Journal of the American Ceramic Society
Jahrgang:   2018
Seiten:   n/a
DOI:   10.1111/jace.15450
Erscheinungsdatum:   20.01.2018
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