期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 354, 期 34, 页码 4075-4080出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2008.05.031
关键词
biological systems; bioglass; crystallization; nucleation; crystals; nanocrystals; diffraction and scattering measurements; Raman scattering; X-ray diffraction; magnetic properties; nuclear magnetic (and quadrupole) resonance; measurement techniques; SEM S100; STEM/TEM; microscopy; scanning electron microscopy; TEM/STEM; microstructure; microcrystallinity; nanoparticles, colloids and quantum structures; nanocrystals; optical properties; FTIR measurements; Raman spectroscopy; oxide glasses; alkali silicates; phosphates; silica; silicates; phosphors; resonance methods; NMR, MAS-NMR and NQR; nuclear spin relaxation; structure
资金
- Ministerio de Educacion y Ciencia, Spain [MAT2004-02791, HP2004-0064, PGIDT05PXIC30301PN]
- Conselho de Reitores das Universidades Portuguesas, Portugal [E-75/05]
Vibrational spectroscopy, Si-29 and P-31 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, 25.3SiO(2)-10.9P(2)O(5)-32.6CaO-31.2MgO and 33.6SiO(2)-6.40P(2)O(5)-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. (C) 2008 Elsevier B.V. All rights reserved.
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