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Orthophosphate nanostructures in SiO2-P2O5-CaO-Na2O-MgO bioactive glasses |
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| Authors: | H. Aguiar,E.L. Solla,P. Gonzá lez,N. Almeida,E.J.C. Davim,R. Correia,J.M. Oliveira,M.H.V. Fernandes |
| Affiliation: | a Applied Physics Department, University of Vigo, Lagoas-Marcosende 9, 36310 Vigo, Spain b Ceramics and Glass Engineering Department, University of Aveiro, 3810-193 Aveiro, Portugal c Centre for Research in Ceramics and Composite Materials, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal d High School of North-Aveiro, University of Aveiro, Edifício Rainha, 5° Andar, 3720-232 Oliveira de Azeméis, Portugal |
| Abstract: | Vibrational spectroscopy, 29Si and 31P magic-angle spinning nuclear magnetic resonance spectroscopy and high resolution transmission electron microscopy were used to investigate structural aspects of SiO2-P2O5-CaO-Na2O-MgO glasses. The experimental results show that for the two compositions, 25.3SiO2-10.9P2O5-32.6CaO-31.2MgO and 33.6SiO2-6.40P2O5-19.0CaO-41.0MgO, phosphorous is present in a nano-crystalline form with interplanar distances in the 0.21-0.26 nm range. The two glasses develop a surface CaP-rich layer and the presence of any intermediate silica-rich layer was not detected. It was suggested that the phosphate nano-regions may play a key role in the initial stages of the bioactive process, acting as nucleation sites for the calcium phosphate-rich layer. |
| Keywords: | 87.50.W&minus |
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