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Structural characterization of bioactive glasses containing rare earth elements (Gd and/or Yb)

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Abstract

Rare earth-containing bioactive glasses are promising materials for biomedical applications like brachytherapy, luminescence-based imaging, magnetic resonance imaging, among others, due to the electronic configuration of rare earth. Although studies of such glasses have continuously been increasing, they still have been poorly studied as biomaterials. In this work, we studied the influence of gadolinium and ytterbium on the structure of bioactive glasses and iron-based bioactive glasses. The glasses were obtained by melt quenching, and their structures were characterized by X-ray diffraction, nuclear magnetic resonance, X-ray photoelectron spectroscopy, electron paramagnetic resonance and scanning electron microscopy. The results showed that the addition of rare earth elements in the glass structure creates more non-bridging oxygen bonds in the silicate network, to satisfy the condition of octahedral coordination of the rare earth ions. An observed Q3 → Q2 + Q1 depolymerization of the glass network is a factor that could favor bioactivity. In conclusion, our experimental data address the bioactive behavior of rare earth-containing glasses to an increased concentration of non-bridging oxygen bonds and a more fragmented network.

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Acknowledgements

The authors gratefully acknowledge Profa. Dra. Marcia Spinace and her graduate student MSc. Asaph for their support on the FTIR analysis, and Prof. Dr. Carlos Rettori and Dr. Michael Cabrera-Baez for their support on the EPR measurements and analysis. We are grateful to the Centro em Ciência e Tecnologia dos Materiais at IPEN/CNEN São Paulo, Brazil, for their support on the scanning electron microscopy, and to Central Experimental Multiusuário CEM/UFABC, Brazil, for the facilities support. The authors also appreciate the financial support provided by UFABC and Brazilian Founding Agencies such as FAPESP (2014/19308-8, 2013/07793-6, 2016/16512-0 and 2011/19924-2) and CNPq (308142/2015-2, 130637/2016-5, 402066/2016-2 and 08142/2015-2).

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  1. Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Avenida dos Estados 5001, Bairro Bangu, Santo André, SP, 09210-580, Brazil

    Roger Borges & Juliana Marchi

  2. Instituto de Física de São Carlos, Universidade de São Paulo, Avenida do Trabalhador São-Carlense 400, Parque Arnold Schmidt, São Carlos, SP, Brazil

    José F. Schneider

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  1. Roger Borges
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Correspondence to Juliana Marchi.

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Borges, R., Schneider, J.F. & Marchi, J. Structural characterization of bioactive glasses containing rare earth elements (Gd and/or Yb). J Mater Sci 54, 11390–11399 (2019). https://doi.org/10.1007/s10853-019-03715-1

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