Measurement of the principal values of the anisotropic diffusion tensor in an unoriented sample by exploiting the chemical shift anisotropy: F-19 PGSE NMR with homonuclear decoupling
2001 (English)In: Journal of magnetic resonance (San Diego, Calif. 1997: Print), ISSN 1090-7807, E-ISSN 1096-0856, Vol. 148, no 1, 73-77 p.Article in journal (Refereed) Published
NMR methods (S. V. Dvinskikh et al. J. Magn. Reson. 142, 102-110 (2000) and S. V. Dvinskikh and I. Furo, J. Magn. Reson. 144, 142-149 (2000)) that combine PGSE with dipolar decoupling are extended to polycrystalline solids and unoriented liquid crystals. Decoupling suppresses dipolar dephasing not only during the gradient pulses but also under signal acquisition so that the detected spectral shape is dominated by the chemical shift tensor of the selected nucleus. The decay of the spectral intensity at different positions in the powder spectrum provides the diffusion coefficient in sample regions with their crystal axes oriented differently with respect to the direction of the field gradient. Hence, one can obtain the principal values of the diffusion tensor. The method is demonstrated by F-19 PGSE NMR with homonuclear decoupling in a lyotropic lamellar liquid crystal.
Place, publisher, year, edition, pages
2001. Vol. 148, no 1, 73-77 p.
PGSE NMR, homonuclear dipolar decoupling, anisotropic diffusion, liquid crystal, polycrystalline sample, nuclear-magnetic-resonance, pentadecafluorooctanoate-water-system, multiple-pulse nmr, self-diffusion, liquid-crystals, spectroscopy, phase, solids
IdentifiersURN: urn:nbn:se:kth:diva-20278ISI: 000166325000009OAI: oai:DiVA.org:kth-20278DiVA: diva2:338972
QC 201005252010-08-102010-08-10Bibliographically approved