Artefacts and pitfalls in diffusion measurements by NMR

✍ Scribed by Geir Humborstad Sørland; Dagfinn Aksnes

• Book ID: 102525091
• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 197 KB
• Volume: 40
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1112

✦ Synopsis

Abstract

When applying pulsed field gradient (PFG) NMR experiments to determine the molecular mobility characterized by the diffusion coefficient, it is crucial to have control over all experimental parameters that may affect the performance of the diffusion experiment. This could be diffusion measurement in the presence of magnetic field transients, internal magnetic field gradients, either constant or spatially varying, convection, mechanical vibrations, or in the presence of physical restrictions affecting the diffusion propagator. The effect of these parameters on the diffusion experiment is discussed and visualized. It is also outlined how to minimize their influence on the measured diffusivity that is extracted from the PFG‐NMR experiment. For an expanded and more general treatment we refer to the excellent reviews by Dr William S. Price (Concepts Magn. Reson. 1997; 9: 299; 1998; 10: 197) and the references therein. Copyright © 2002 John Wiley & Sons, Ltd.