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Karpukhina, Natalia
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Publications (8/8 displayed)
- 2024Phosphate/Silicate Ratio Allows for Fine-Tuning of Bioactive Glass Crystallisation and Glass-Ceramic Microstructure
- 2024Phosphate/Silicate Ratio Allows for Fine-Tuning of Bioactive Glass Crystallisation and Glass-Ceramic Microstructure
- 2021Nano-imaging confirms improved apatite precipitation for high phosphate/silicate ratio bioactive glasses
- 2021Nano-imaging confirms improved apatite precipitation for high phosphate/silicate ratio bioactive glassescitations
- 2021Nano-imaging confirms improved apatite precipitation for high phosphate/silicate ratio bioactive glasses
- 2018Molecular Dynamics Investigation of Halide-Containing Phospho-Silicate Bioactive Glassescitations
- 2016Design and Synthesis of New Translucent, High Strength Leucite Glass-Ceramics
- 2014Leucite Glass Ceramics
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article
Phosphate/Silicate Ratio Allows for Fine-Tuning of Bioactive Glass Crystallisation and Glass-Ceramic Microstructure
Abstract
A combination of XRD, solid-state NMR and state-of-the-art imaging techniques were used to investigate how the calcium orthophosphate/calcium silicate ratio affects the crystallisation of bioactive glasses in the system SiO2-P2O5-CaO-CaF2. In the phosphate-free glass, xonotlite, wollastonite and cuspidine crystallised. From 2.4 mol% P2O5, fluorapatite also formed, while the amount of wollastonite decreased. Crystallisation tendency was low for low phosphate contents, while above 3 mol% P2O5 it increased. The phosphate-free glass showed a volume crystallisation mechanism with constant activation energy. By contrast, the glass with the largest phosphate to silicate ratio showed both volume and surface crystallisation, causing a pronounced decrease in activation energy with crystallisation degree. This work shows that by changing the phosphate/silicate ratio we can determine which crystal phases form, obtaining for example fluorapatite-free or wollastonite-free glass-ceramics, depending on the desired application and properties such as mechanical strength or activity in contact with physiological solutions.