Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 455, Issue -, Pages 90-97Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2016.10.031
Keywords
Mesoporosity; Bioactive glasses; Ion-doped glasses; Therapeutic ions; NMR
Funding
- Ministerio de Economia y Competitividad [MAT2013-43299-R, MAT2015-64831-R]
- European Research Council [ERC-2015-AdG]
- Advanced Grant Verdi [694160]
- Agening Network of Excellence [CSO2010-11384-E]
- Instituto de Salud Carlos III [PI15/00978]
- EU-ITN project GlaCERCo [GA 264526]
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Ion-doped binary SiO2-CaO and ternary SiO2-CaO-P2O5 mesoporous bioactive glasses were synthesized and characterized to evaluate the influence of P2O5 in the glass network structure. Strontium, copper and cobalt oxides in a proportion of 0.8 mol% were selected as dopants because the osteogenic and angiogenic properties reported for these elements. Although the four glass compositions investigated presented analogous textural properties, TEM analysis revealed that the structure of those containing P2O5 exhibited an increased ordered mesoporosity. Furthermore, Si-29 NMR revealed that the incorporation of P2O5 increased the network connectivity and that this compound captured the Sr2+, Cu2+ and Co2+ ions preventing them to behave as modifiers of the silica network. In addition, P-31 NMR results revealed that the nature of the cation directly influences the characteristics of the phosphate clusters. In this study, we have proven that phosphorous oxide entraps doping-metallic ions, granting these glasses with a greater mesopores order. (C) 2016 Elsevier B.V. All rights reserved.
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