C-13 PGSE NMR experiment with heteronuclear dipolar decoupling to measure diffusion in liquid crystals and solids
2000 (English)In: Journal of magnetic resonance (San Diego, Calif. 1997: Print), ISSN 1090-7807, E-ISSN 1096-0856, Vol. 142, no 1, 102-110 p.Article in journal (Refereed) Published
A new PGSE NMR experiment, designed to measure molecular diffusion coefficients in systems with nonvanishing static dipolar coupling, is described. The fast static dipolar dephasing of the single-quantum C-13 coherences is removed by multiple-pulse heteronuclear decoupling. The resulting slow dephasing of the C-13 coherences allows for inserting appropriate gradient pulses into the pulse sequence. The presence of the large magnetic field gradient reduces the efficiency of the decoupling sequences which is compensated for by introducing a scheme of sequential slice selection across the sample. The method is demonstrated by F-19-decoupled C-13 PGSE NMR experiments in a lyotropic nematic and lamellar liquid crystal,
Place, publisher, year, edition, pages
2000. Vol. 142, no 1, 102-110 p.
PGSE NMR, heteronuclear dipolar decoupling, slice selection, liquid crystals, cesium perfluorooctanoate, nuclear-magnetic-resonance, pentadecafluorooctanoate-water-system, multiple-pulse nmr, studying translational diffusion, gradient spin-echo, self-diffusion, orientational order, lamellar phases, field gradients, micelle size
IdentifiersURN: urn:nbn:se:kth:diva-19525ISI: 000085222700011OAI: oai:DiVA.org:kth-19525DiVA: diva2:338217
QC 201005252010-08-102010-08-10Bibliographically approved