期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 114, 期 45, 页码 19345-19356出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp105408c
关键词
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资金
- Swedish Research Council
- Magn. Bergvall Foundation
- Faculty of Natural Sciences at Stockholm University
- CICYT Spain [MAT 2008-00736]
- Comunidad Autonoma de Madrid [S2009/MAT-1472]
- Carl Trygger Foundation
- Wenner-Gren Foundations
An array of magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy experiments is applied to explore the surface reactions of a mesoporous bioactive glass (MBG) of composition Ca0.10Si0.85P0.04O1,90 when subjected to a simulated body fluid (SBF) for variable intervals. Powder X-ray diffraction and P-31 NMR techniques are employed to quantitatively monitor the formation of an initially amorphous calcium phosphate surface layer and its subsequent crystallization into hydroxycarbonate apatite (HCA). Prior to the onset of HCA formation, H-1 -> Si-29 cross-polarization (CP) NMR evidence dissolution of calcium ions; a slightly increased connectivity of the speciation of silicate ions is observed at the MBG surface over 1 week of SBF exposure. The incorporation of carbonate and sodium ions into the bioactive orthophosphate surface layer is explored by H-1 -> C-13 CPMAS and Na-23 NMR, respectively. We discuss similarities and distinctions in composition-bioactivity relationships established for traditional melt-prepared bioglasses compared to MBGs. The high bioactivity of phosphorus-bearing MBGs is rationalized to stem from an acceleration of their surface reactions due to presence of amorphous calcium orthophosphate clusters of the MBG pore wall.
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