Chungong, LF;
Isaacs, MA;
Morrell, AP;
Swansbury, LA;
Hannon, AC;
Lee, AF;
Mountjoy, G;
(2019)
Insight into the atomic scale structure of CaF₂-CaO-SiO₂ glasses using a combination of neutron diffraction, ²⁹Si solid state NMR, high energy X-ray diffraction, FTIR, and XPS.
Biomedical Glasses
, 5
(1)
pp. 112-123.
10.1515/bglass-2019-0010.
(In press).
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[Biomedical Glasses] Insight into the atomic scale structure of CaF2-CaO-SiO2 glasses using a combination of neutron diffraction 29Si solid state NMR high energy X-ray diffraction FTIR and XPS.pdf - Published Version Download (1MB) | Preview |
Abstract
Bioactive glasses are important for biomedical and dental applications. The controlled release of key ions, which elicit favourable biological responses, is known to be the first key step in the bioactivity of these materials. Properties such as bioactivity and solubility can be tailored for specific applications. The addition of fluoride ions is particularly interesting for dental applications as it promotes the formation of fluoro-apatite. To date there have been mixed reports in the literature on how fluorine is structurally incorporated into bioactive glasses. To optimize the design and subsequent bioactivity of these glasses, it is important to understand the connections between the glass composition, structure and relevant macroscopic properties such as apatite formation and glass degradation in aqueous media. Using neutron diffraction, high energy X-ray diffraction, ²⁹Si NMR, FTIR and XPS we have investigated the atomic scale structure of mixed calcium oxide / calcium fluoride silicate based bioactive glasses. No evidence of direct Si-F bonding was observed, instead fluorine was found to bond directly to calcium resulting in mixed oxygen/fluoride polyhedra. It was therefore concluded that the addition of fluorine does not depolymerise the silicate network and that the widely used network connectivity models are valid in these oxyfluoride systems.
| Type: | Article |
|---|---|
| Title: | Insight into the atomic scale structure of CaF₂-CaO-SiO₂ glasses using a combination of neutron diffraction, ²⁹Si solid state NMR, high energy X-ray diffraction, FTIR, and XPS |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1515/bglass-2019-0010 |
| Publisher version: | https://doi.org/10.1515/bglass-2019-0010 |
| Language: | English |
| Additional information: | © 2019 Louis Forto Chungong et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution 4.0 Public License (http://creativecommons.org/licenses/by/4.0). |
| Keywords: | Bioactive glass; fluoride; structure; network connectivity |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10089034 |
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