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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Enhanced resolution and quantitation from 'ultrahigh' field NMR spectroscopy of glasses
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Enhanced resolution and quantitation from 'ultrahigh' field NMR spectroscopy of glasses

机译：眼镜的“超高”场NMR光谱提高了分辨率和定量

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摘要

The utilization of higher magnetic fields for nuclear magnetic resonance (NMR) (e.g., 14.1 and 18.8 T) can enhance both resolution and sensitivity in studies of disordered materials. When used in conjunction with fast magic angle spinning (MAS), high-field NMR can yield structural information not always available from NMR experiments of glasses at lower fields. Examples include site distinction of multiple boron groupings in B-11 MAS NMR spectra of borate glasses, the spectroscopic observation of low concentrations of five- and six-co-ordinate aluminum species in Al-27 MAS NMR spectra of aluminosilicate glasses, and new insight into magnesium co-ordination environments in silicate glasses using Mg-25 MAS NMR. Also presented are O-17 MAS NMR spectra of a zeolite in which high-field experiments permit resolution and quantification of bound molecular water. Comparisons of spectral data collected at 18.8 T with those at lower fields demonstrate these principles and indicate the potential of high-field MAS NMR applications to amorphous solids. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 32]
机译：利用更高的磁场进行核磁共振（NMR）（例如14.1和18.8 T）可以提高无序材料研究的分辨率和灵敏度。当与快速魔角旋转（MAS）结合使用时，高场NMR可以产生在较低场下玻璃的NMR实验中并不总是可获得的结构信息。实例包括硼酸盐玻璃的B-11 MAS NMR光谱中多个硼族的位点区分，铝硅酸盐玻璃的Al-27 MAS NMR光谱中低浓度五和六坐标铝物种的光谱观察以及新的见解Mg-25 MAS NMR分析硅酸盐玻璃中的镁配位环境。还介绍了沸石的O-17 MAS NMR光谱，其中高场实验允许分离和定量结合的分子水。 18.8 T处收集的光谱数据与较低场的光谱数据进行比较，证明了这些原理，并表明了高场MAS NMR在无定形固体中的应用潜力。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：32]

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