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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Borges, Roger [1] ; Schneider, Jose F. [2] ; Marchi, Juliana [1]
Total Authors: 3
Affiliation:
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Ave Estados 5001, BR-09210580 Santo Andre, SP - Brazil
[2] Univ Sao Paulo, Inst Fis Sao Carlos, Ave Trabalhador Sao Carlense 400, Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Materials Science; v. 54, n. 17, p. 11390-11399, SEP 2019.
Web of Science Citations: 1
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 Q(3)Q(2)+Q(1) 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. (AU)

FAPESP's process: 14/19308-8 - Structural characterization of biocompatible glass and vitroceramic proposed for cancer treatment by hyperthermia
Grantee:Natália Del Rey Menezes
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach
Grantee:Carlos Rettori
Support type: Research Projects - Thematic Grants