PMID: 8581431Aug 1, 1995Paper

Nuclear spin-lattice relaxation mechanisms in kaolinite confirmed by magic-angle spinning

Solid State Nuclear Magnetic Resonance
S Hayashi, E Akiba

Abstract

Spin-lattice relaxation mechanisms in kaolinite have been reinvestigated by magic-angle spinning (MAS) of the sample. MAS is useful to distinguish between relaxation mechanisms: the direct relaxation rate caused by the dipole-dipole interaction with electron spins is not affected by spinning while the spin diffusion-assisted relaxation rate is. Spin diffusion plays a dominant role in 1H relaxation. MAS causes only a slight change in the relaxation behavior, because the dipolar coupling between 1H spins is strong. 29Si relaxes directly through the dipole-dipole interaction with electron spins under spinning conditions higher than 2 kHz. A spin diffusion effect has been clearly observed in the 29Si relaxation of relatively pure samples under static and slow-spinning conditions. 27Al relaxes through three mechanisms: phonon-coupled quadrupole interaction, spin diffusion and dipole-dipole interaction with electron spins. The first mechanism is dominant, while the last is negligibly small. Spin diffusion between 27Al spins is suppressed completely at a spinning rate of 2.5 kHz. We have analyzed the relaxation behavior theoretically and discussed quantitatively. Concentrations of paramagnetic impurities, electron spin-lattice relaxat...Continue Reading

Citations

Jun 13, 2009·Solid State Nuclear Magnetic Resonance·Søren L PoulsenJørgen Skibsted
Sep 8, 2006·Magnetic Resonance in Chemistry : MRC·Vladimir I BakhmutovAbraham Clearfield
Nov 30, 2016·Physical Chemistry Chemical Physics : PCCP·Carmelo CorsaroMauro Missori
Oct 4, 2002·Journal of Feline Medicine and Surgery·G D NorsworthyJ A Milios
Jul 12, 2017·Journal of the American Chemical Society·Sachin R ChaudhariLyndon Emsley

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