Understanding the mixed alkali effect on the sinterability and in vitro performance of bioactive glasses
| Autor: | Paulo Tambasco de Oliveira, Oscar Peitl, Larissa Moreira Spinola de Castro Raucci, Edgar Dutra Zanotto, Viviane Oliveira Soares, Ana Candida Martins Rodrigues, Murilo C. Crovace |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Sintering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Chemical engineering law Bioglass 45S5 0103 physical sciences Viscous flow Materials Chemistry Ceramics and Composites Mixed alkali effect Crystallization 0210 nano-technology |
| Zdroj: | Journal of the European Ceramic Society. 41:4391-4405 |
| ISSN: | 0955-2219 |
| Popis: | Bioglass 45S5 is widely known for its ability to regenerate bone. However, this glass cannot be fully densified by viscous flow due to its very high tendency for crystallization. In this work, we evaluate the sintering and bioactivity of Bioglass 45S5-based compositions in which Na2O is incrementally replaced by K2O. Our sintering tests demonstrated that the densification of Bioglass 45S5 powders can be significantly enhanced due to a decreased crystallization tendency. The composition in which half of the original Na2O content was substituted by K2O exhibits the highest densification rate, evidencing the mixed alkali effect (MAE) in the viscous-flow-driven sintering process. The replacement of Na2O by K2O significantly improved both the densification rate and the in vitro performance. These results are very relevant for this particular glass and also for the design of new bioactive glasses with improved sinterability. |
| Databáze: | OpenAIRE |
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