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• W2338633548 abstract "Event Abstract Back to Event The influence of increasing Sr2+content on the structure of borate-based glasses. Yiming Li1, 2, Dj Curran1, 2, E Schemitsch2, P Zalzal3, M Papini1, Aw Wren4 and Mr Towler1, 2, 5 1 Ryerson University, Mechanical and Industry Enginerring, Canada 2 St. Michael’s Hospital, 2Keenan Research Centre, Canada 3 3Oakville Memorial Hospital, Canada 4 Alfred University, 4Inamori School of Engineering, United States 5 University Malaya, Department of Biomedical Engineering, Malaysia Introduction: Strontium, when incorporated as a network modifier, has been reported to increase the hardness and reduce the dissolution of a glass[1]. Additionally, Sr2+ can stimulate bone formation in vitro[2]. This project was designed to investigate the influence of increasing Sr2+ content on the structure of a borate-based glass series expected to be applied as bioactive coatings on the Ti-6Al-4V implants. Methods: Glass series were formulated (Table I) by melt quenching. X-ray Diffraction (XRD), Differential Thermal Analysis (DTA) and Raman Spectroscopy were employed to investigate any changes in the glass structure as a result of increasing Sr content. Results and Discussions: The absence of peaks in the XRD traces confirm the amorphous nature of each glass. The glass transition temperatures (Tg) of the glass series decreased with addition of up to 5 mol% of Sr2+, and then increased with increased additions of Sr2+. It is apparent that the Raman spectra (Figure 1) are dominated by a broad peak centered at 1320 cm-1 and a shoulder at 1500 cm-1. In addition, three Raman bands were detected at 770 cm-1, 860 cm-1 and 940 cm-1. The intensity of the band at 770 cm-1 decreased with increasing Sr2+. However, the intensity of bands at 860 cm-1 and 940 cm-1 increased with Sr2+ content. The symmetric breathing vibration of [BØ4] is assigned at around 770 cm-1[3]. The increasing intensity of Raman bands at 860 cm-1 and 940 cm-1 and the larger peak areas under 860 cm-1, 1320 cm-1 and 1500 cm-1 indicate increased presence of [BØ2O]- and [B2ØO4]4- group introduced by non-bridging oxygen (NBO) within the glasses as more Sr2+ is incorporated. [3] Tg of borate glasses increased with the increase Metal-oxygen boding (FR-O). Therefore, more ionic Sr-O bonding increases Tg of the glass series. Table 1. Compositions of the glass series (mol%). Figure 1. Raman spectroscopy of the borate glass series. Conclusions: Increasing Sr2+ content induced higher amounts of NBO expected to decrease Tg. However, Tg increased with the addition of more than 5 mol% of Sr2+. This can be explained by the fact that enough Sr2+was present to induce more Sr-O bonding providing additional cross-links across borate segments of the glass network. The Canadian Institute of Health Research (CIHR); The Natural Sciences and Engineering Research Council of Canada (NSERC) through the Collaborative Health Research Project (CHRP) program (grant #315694-DAN)References:[1] Li, Y., Coughlan, A., Laffir, F.R., Pradhan, D., Mellott, N.P., and Wren, A.W., Investigating the mechanical durability of bioactive glasses as a function of structure, solubility and incubation time. Journal of Non-Crystalline Solids, 2013. 380: p. 25-34[2] O’Donnell, M., Candarlioglu, P.L., Miller, C.A., Gentleman, E., and Stevens, M.M., Materials characterisation and cytotoxic assessment of strontium-substituted bioactive glasses for bone regeneration. Journal of Materials Chemistry, 2010. 20(40): p. 8934-8941.[3] Yiannopoulos, Y., Chryssikos, G.D., and Kamitsos, E., Structure and properties of alkaline earth borate glasses. Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B, 2001. 42(3): p. 164-172 Keywords: Structure, Biodegradable material Conference: 10th World Biomaterials Congress, Montréal, Canada, 17 May - 22 May, 2016. Presentation Type: Poster Topic: Bioactive glasses Citation: Li Y, Curran D, Schemitsch E, Zalzal P, Papini M, Wren A and Towler M (2016). The influence of increasing Sr2+content on the structure of borate-based glasses.. Front. Bioeng. Biotechnol. Conference Abstract: 10th World Biomaterials Congress. doi: 10.3389/conf.FBIOE.2016.01.00850 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 27 Mar 2016; Published Online: 30 Mar 2016. Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Yiming Li Dj Curran E Schemitsch P Zalzal M Papini Aw Wren Mr Towler Google Yiming Li Dj Curran E Schemitsch P Zalzal M Papini Aw Wren Mr Towler Google Scholar Yiming Li Dj Curran E Schemitsch P Zalzal M Papini Aw Wren Mr Towler PubMed Yiming Li Dj Curran E Schemitsch P Zalzal M Papini Aw Wren Mr Towler Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page." @default.
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• W2338633548 title "The influence of increasing Sr2+content on the structure of borate-based glasses." @default.
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