期刊
CHEMISTRY OF MATERIALS
卷 25, 期 9, 页码 1877-1885出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm400487a
关键词
bioactive glasses; phosphate distribution; calcium phosphate clusters; multiple quantum coherence; 45S5 Bioglass
资金
- Swedish Research Council [VR-NT 2009-7551, 2010-4943]
- Carl Trygger Foundation
- Faculty of Sciences at Stockholm University
- CICYT Spain [MAT 2008-00736]
- Comunidad Autonoma de Madrid [S2009/MAT-1472]
- Swedish Research Council
- Knut and Alice Wallenberg Foundation
By employing P-31 multiple-quantum coherence-based solid-state nuclear magnetic resonance spectroscopy, we present the first comprehensive experimental assessment of the nature of the orthophosphate ion distributions in silicate based bioactive glasses (BGs). Results are provided both from melt prepared BG and evaporation-induced self-assembly-derived mesoporous bioactive glass (MEBG) structures of distinct compositions. The phosphate species are randomly dispersed in melt-derived BGs (comprising 44-55 mol % SiO2) of the Na2O-CaO-SiO2-P2O5 system, whereas a Si-rich (86 mol % SiO2) and Ca-poor ordered MBG structure exhibits nanometer-sized amorphous calcium phosphate clusters, conservatively estimated to comprise at least nine orthophosphate groups. A Ca-richer MBG (58 mol % SiO2) reveals a less pronounced phosphate clustering. We rationalize the variable structural role of P in these amorphous biomatetials.
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