Effects of Finite Rf Pulses and Sample Spinning Speed in Multiple-Quantum Magic-Angle Spinning (MQ-MAS) and Multiple-Quantum Quadrupolar Carr−Purcell−Meiboom−Gill Magic-Angle Spinning (MQ-QCPMG-MAS) Nuclear Magnetic Resonance of Half-Integer Quadrupolar Nuclei

1999 ◽  
Vol 103 (50) ◽  
pp. 10825-10832 ◽  
Author(s):  
Flemming H. Larsen ◽  
Niels Chr. Nielsen
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Quadrupolar Nuclei ◽  
Multiple Quantum ◽  
Rf Pulses ◽  
Half Integer ◽  
Angle Spinning ◽  
Spinning Speed

Novel nuclear magnetic resonance techniques for the study of quadrupolar nuclei in clays and other layered materials

Clay Minerals ◽  
2003 ◽  
Vol 38 (3) ◽  
pp. 259-278 ◽  
Author(s):  
J . Rocha ◽  
C. M. Morais ◽  
C. Fernandez
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Layered Materials ◽  
Magic Angle Spinning ◽  
Resonance Spectroscopy ◽  
Magic Angle ◽  
Quadrupolar Nuclei ◽  
Multiple Quantum ◽  
Angle Spinning ◽  
Nuclear Magnetic

AbstractThe main developments taking place in Nuclear Magnetic Resonance Spectroscopy (NMR) of quadrupolar (spin I > 1/2) nuclei with half integer spins in solids, particularly clays and other layered materials, have been reviewed. The advent of Multiple-Quantum (MQ) Magic-Angle Spinning (MAS) NMR spectroscopy has been a step-change development to the studies of quadrupolar nuclei in solids. It is now possible to record high-resolution spectra of important nuclei, such as 11B, 17O, 23Na, 27Al and 69,71Ga, in synthetic and natural clays. Since its introduction in 1995 MQMAS NMR has evolved considerably and, at present, a range of very useful related techniques are available and have been reviewed, as has the current situation with regard to applications to clays and other layered materials.

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