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• W2319438049 abstract "Event Abstract Back to Event A Fourier transform infrared spectroscopic study of tantalum-containing silicate bio-glasses Adel M. Alhalawani1, 2, Declan J. Curran1, 2*, Timothy J. Keenan3*, Anthony W. Wren3*, Daniel Boyd4* and Mark R. Towler1, 2, 5 1 Ryerson University, Department of Mechanical & Industrial Engineering, Canada 2 St. Michael’s Hospital, Li Ka Shing Knowledge Institute, Canada 3 Alfred University, Inamori School of Engineering, United States 4 Dalhousie University, Department of Applied Oral Sciences, Canada 5 University of Malaya, Department of Biomedical Engineering, Malaysia Introduction: Bioglasses have the ability to bond to human tissue and can play a role in bone formation[1]. Tantalum (Ta) has previously been used in both bone markers and fixation plates due to its excellent ductility, toughness, corrosion resistance, radio-opacity and bioactivity[2]. This work investigates the effect of tantalum additions on silicate glasses using Fourier transform infrared (FTIR) analysis. Materials and Methods: Five glasses were formulated for this study, see Table 1. The powdered reagents were fired (1550 ºC, 1 h) in silica crucibles and quenched in water at room temperature (23±1°C). The resulting frit was dried (100ºC, 1 h), ground and sieved to retrieve glass powders with a particle size ≤ 45 µm. FTIR spectra of the glass powders were then recorded (Spectrum One, Perkin Elmer Instruments, USA). ~0.1 g of the glass powder was placed on a NaCl crystal disc of 25 mm diameter and spread to form a thin film. The spectra were collected 5 times for each glass formulation in ambient air (23±1°C). Analysis was undertaken between 1500 to 500 cm−1 with a spectral resolution of 4 cm−1. Table 1. Composition of glass series in mole fraction. Results and Discussions: FTIR transmittance spectra are presented in Figure 1. A broad band centered at 1038 cm-1 is observed and consists of a) asymmetric stretching of Si-O/Si-O-NBO (980-850 cm-1), and Si-O-Si (1100-1000 cm-1) and b) asymmetric and symmetric stretching vibrations of terminal P-O (1200-1100 cm-1) bonds. This band (1038 cm-1) decreases in intensity with increasing Ta2O5 content and can be attributed to Ta incorporation inside the covalent silicate or phosphate chains, resulting in bridging Ta-O-P and/or Si-O-Ta bonds[3]. The presence of a sharp peak at 668 cm-1 is assigned to ≥ 5 fold-rings resulting from Ta in six-fold coordination entering the silicate or phosphate network, thus verifying the co-existence of tantalum units in the silicate network structure, however the peak at 668 cm-1 is not observed for Ta-4; the reason for this is unclear. The bending vibration peak at 555 cm-1 is assigned to the P-O asymmetric vibration of groups[4] indicating that P2O5 acts as a network modifier within the glass network, however the decrease in the intensity of this peak with increasing Ta2O5 content indicates that P2O5 may also act as a network former within the same glass network. Figure 1: FTIR spectra of the glass series Conclusions: The results suggest a structural model evolution in which the addition of Ta to the Si-Zn-Ca-Sr-P glass system causes a disruption in the network facilitating the insertion of octahedral TaO6 between the PO4 and SiO4 tetrahedra and forming a tri-dimensional network. This initial study has shown that incorporation of Ta2O5 can lead to the development of new bio-glasses for clinical purposes. Acknowledgments: The authors would like to thank the Atlantic Canada Opportunities Agency (grant # 197820) for financial support.References:[1] W. Cao, L.L. Hench, Bioactive materials, Ceram. Int. 22 (1996) 493–507. doi:10.1016/0272-8842(95)00126-3.[2] J. Black, Biologic performance of tantalum, Clin. Mater. 16 (1994) 167–173. doi:10.1016/0267-6605(94)90113-9.[3] L. Cordeiro, R.M. Silva, G.M. de Pietro, C. Pereira, E.A. Ferreira, S.J.L. Ribeiro, et al., Thermal and structural properties of tantalum alkali-phosphate glasses, J. Non. Cryst. Solids. 402 (2014) 44–48. doi:10.1016/j.jnoncrysol.2014.05.015.[4] H.B. Pan, X.L. Zhao, X. Zhang, K.B. Zhang, L.C. Li, Z.Y. Li, et al., Strontium borate glass: potential biomaterial for bone regeneration., J. R. Soc. Interface. 7 (2010) 1025–1031. doi:10.1098/rsif.2009.0504. Keywords: Biodegradable material, Bioactive molecule Conference: 10th World Biomaterials Congress, Montréal, Canada, 17 May - 22 May, 2016. Presentation Type: Poster Topic: Bioactive glasses Citation: Alhalawani AM, Curran DJ, Keenan TJ, Wren AW, Boyd D and Towler MR (2016). A Fourier transform infrared spectroscopic study of tantalum-containing silicate bio-glasses. Front. Bioeng. Biotechnol. Conference Abstract: 10th World Biomaterials Congress. doi: 10.3389/conf.FBIOE.2016.01.02136 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. * Correspondence: Dr. Declan J Curran, Ryerson University, Department of Mechanical & Industrial Engineering, Toronto, ON, Canada, curran@ryerson.ca Dr. Timothy J Keenan, Alfred University, Inamori School of Engineering, Alfred, NY, United States, TJK2@alfred.edu Dr. Anthony W Wren, Alfred University, Inamori School of Engineering, Alfred, NY, United States, wren@alfred.edu Dr. Daniel Boyd, Dalhousie University, Department of Applied Oral Sciences, Halifax, NS, Canada, d.boyd@dal.ca 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 Adel M Alhalawani Declan J Curran Timothy J Keenan Anthony W Wren Daniel Boyd Mark R Towler Google Adel M Alhalawani Declan J Curran Timothy J Keenan Anthony W Wren Daniel Boyd Mark R Towler Google Scholar Adel M Alhalawani Declan J Curran Timothy J Keenan Anthony W Wren Daniel Boyd Mark R Towler PubMed Adel M Alhalawani Declan J Curran Timothy J Keenan Anthony W Wren Daniel Boyd Mark R 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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• W2319438049 title "A Fourier transform infrared spectroscopic study of tantalum-containing silicate bio-glasses" @default.
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