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The Use of Sample Rotation for Minimizing Convection Effects in Self-Diffusion NMR Measurements

✍ Scribed by Nuria Esturau; Francesc Sánchez-Ferrando; José Adrián Gavin; Christian Roumestand; Marc-André Delsuc; Teodor Parella

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 144 KB
Volume: 153
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.2001.2411

No coin nor oath required. For personal study only.

✦ Synopsis

Undesirable temperature gradients in a NMR sample tube are usually generated by an inappropiate temperature regulation system. We have shown that such convection effects can greatly distort the measurement of translational self-diffusion coefficients. The use of sample spinning helps to minimize such undesirable effects by disruption of convection fluxes due to resulting Coriolis forces that have a strongly stabilizing effect on the conducting state of the system (J. Lounila et al., J. Magn. Reson. A 118, 50 (1996)). This simple trick allows the accurate measurement of diffusion coefficients for a wide range of temperatures and solvents without the need for a convection-compensated NMR pulse sequences or more sophisticated temperature control units. Experimental data obtained for some target compounds dissolved in several common deuterated solvents at different temperatures are reported and discussed.

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