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Anisotropic self-diffusion in the nematic phase of a thermotropic liquid crystal by H-1-spin-echo nuclear magnetic resonance
KTH, Superseded Departments, Chemistry.ORCID iD: 0000-0002-6524-1441
KTH, Superseded Departments, Chemistry.ORCID iD: 0000-0002-0231-3970
2001 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 115, no 4, 1946-1950 p.Article in journal (Refereed) Published
Abstract [en]

The orientation-dependent molecular diffusion in the nematic liquid crystal 4-pentyl-4'-cyanobiphenyl is measured to high accuracy. The applied nuclear magnetic resonance method combines multiple-pulse homonuclear dipolar decoupling with pulsed-field-gradient stimulated echo and slice selection. The obtained temperature dependencies of the principal diffusion coefficients are not described by a simple Arrhenius relationship but reflect the decrease of the molecular orientational order close to the nematic-to-isotropic phase transition. The geometric average of the principal diffusion coefficients is continuous with the diffusion coefficient in the isotropic phase. The results are best described in terms of the affine transformation model of diffusion in hard-ellipsoid nematics.

Place, publisher, year, edition, pages
2001. Vol. 115, no 4, 1946-1950 p.
Keyword [en]
studying translational diffusion, multiple-pulse nmr, pgse nmr, stimulated-echo, scattering, dynamics, water, tool
Identifiers
URN: urn:nbn:se:kth:diva-20780ISI: 000169800000035OAI: oai:DiVA.org:kth-20780DiVA: diva2:339477
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Dvinskikh, Sergey V.Furo, Istvan

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