Advanced SearchSearch Tips
An Investigation of the Sample Rotation Effects on Suppression of Convective Flows in PGSE Diffusion NMR Experiments
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
An Investigation of the Sample Rotation Effects on Suppression of Convective Flows in PGSE Diffusion NMR Experiments
Kim, Minkyoung; Chung, Kee-Choo;
  PDF(new window)
Undesirable convective flow in an NMR tube inhibits the accurate measurement of diffusion coefficients by NMR spectroscopy. To minimize the convection effects, various methods have been suggested, and it has been known that the use of sample rotation can be useful. However, it has not been clearly examined that the convection suppressing effect of the sample rotation under the different spinning speeds. In this study, the relation between convective flow and the sample rotation was investigated using PGSE NMR diffusion experiments to reveal the feasibility for controlling the convective flow in an NMR tube by sample rotation itself. The viscosity effect was also examined using solvents with four different viscosities, acetone- chloroform-d, pyridine-, and . The sample rotation showed apparent convection suppressing effects at all temperature range for the low viscosity solvents, acetone- and chloroform-d, even at the faster than 5 Hz spinning rate. The similar patterns were also observed for pyridine- and , which have higher viscosity. This effect was observed even at high temperatures where convective flow arises conspicuously.
diffusion;convection;sample rotation;viscosity;volume effect;NMR;
 Cited by
H. Barjat, G. A. Morris, S. Smart, A. G. Swanson, and S. C. R. Williams, J. Mag. Reson. B 108, 170 (1995) crossref(new window)

L. Avram and Y. Cohen, J. Am. Chem. Soc. 124, 15148 (2002) crossref(new window)

S. W. Jeong and D. F. O'Brein, Langmuir. 18, 1073 (2002) crossref(new window)

N. M. Loening and J. Keeler, J. Magn. Reson. 159, 55 (2002) crossref(new window)

K.-C. Chung, H.-Y. Yu, and S. Ahn, Bull. Korean Chem. Soc. 1970 (2011)

J.-M. Wieruszeski, B. Fritzinger, X. Hanoulle, J. C. Martins, and G. J. Lippens, J. Magn. Reson. 193, 37 (2008) crossref(new window)

K. Hayamizu and W. S. Price, J. Magn. Reson. 167, 328 (2004) crossref(new window)

G. H. Sorland, J. G. Seland, J. Krane, and H. W. Anthonsen, J. Magn. Reson. 142, 323 (2000) crossref(new window)

N. Esturau, F. S'anchez-Ferrando, J. A. Gavin, C. Roumestand, M.-A. Delsuc, and T. Parella, J. Magn. Reson. 153, 48 (2001) crossref(new window)

J. Lounila, K. Oikarinen, P. Ingman, and J. Jokisaari J. Magn. Reson. A, 118, 50 (1996) crossref(new window)

J. H. Seo and K.-C. Chung, J. Kor. Mag. Reson. Soc. 16, 122 (2012) crossref(new window)

S. F. Babak and V. V. Udovenko, J. Gen. Chem. 20, 2204 (1950)

S. A. Levichev, "Fiziko-chimiceskie Svojstva Rastvorov" (1960)

R. Anantharaj and T. Banerjee, J. Ind. Eng. Chem. 18, 331 (2012) crossref(new window)

I. Swan,, M. Reid, P.W.A. Howe, M.A. Connell, M. Nilsson, M.A. Moore, and G.A. Morris, J. Mag. Reson. 252, 120 (2015) crossref(new window)