Cross-polarization and magic angle sample spinning

For the morphological discussions, NMR measurements must be carried out in the solid state. The cross-polarization and magic angle sample spinning (CPMAS) for and the solid echo pulse sequence for are practical methods. From CPMAS measurements, the spectrum similar to the solution NMR spectrum is observed. NMR chemical shifts are easily obtained from the CPMAS spectrum. Furthermore, the application of the sequence developed by Torchia supplies Tj in the solid state. However, C NMR measurements are time consuming because of the low natural abundance of C nucleus. Tj of H can be observed easily by the solid echo... 

We report here the application of the solid state carbon-13 1 1R with cross-polarization (CP), high power proton decoupling, and magic-angle sample spinning (MAS) to study the curing of epoxy resins. On the basis of our preliminary studies, we show here the application of solid state carbon-13 NMR spectroscopic data to determine some of the Important parameters such as the gelation point and effective functionality of the epoxy monomers. 

S. Hediger, B. H. Meier and R. R. Ernst, Rotor-synchronized amplitude-modulated nuclear magnetic resonance spin-lock sequences for improved cross polarization under fast magic angle sample spinning. J. Chem. Phys., 1995, 102, 4000-4011. 

The pursuit of sensitivity and resolution in the solid state has led to the variety of NMR techniques that are now available to the oil shale researcher. The development of these techniques is attributable to the development of cross-polarization, coupled with magic-angle sample spinning. The combination of these techniques solved a number of the problems associated with sensitivity and resolution of NMR in solids. Crosspolarization overcomes some of the problems associated with sensitivity while magic-angle spinning overcomes some problems of resolution. 

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