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Anisotropic self-diffusion in thermotropic liquid crystals studied by H-1 and H-2 pulse-field-gradient spin-echo NMR
KTH, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-0231-3970
2002 (Engelska)Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, ISSN 1063-651X, E-ISSN 1095-3787, Vol. 65, nr 6Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The molecular self-diffusion coefficients in nematic and smectic-A thermotropic liquid crystals are measured using stimulated-echo-type H-2 and H-1 pulse-field-gradient spin-echo nuclear magnetic resonance (PGSE NMR) combined with multiple-pulse dipolar decoupling and slice selection. The temperature dependence of the principal components of the diffusion tensor in the nematic phase follows a simple Arrhenius relationship except in the region of nematic-isotropic phase transition where it reflects, merely, the decrease of the molecular orientational order. The average of the principal diffusion coefficients in the isotropic-nematic phase transition region is close to the diffusion coefficient in the isotropic phase. At the nematic-smectic-A phase transition the diffusion coefficients change continuously. The results in nematic phase are best described in terms of the affine transformation model for diffusion in nematics formed by hard ellipsoids. In the smectic-A phase the data are interpreted using a modified model for diffusion in presence of a periodic potential along the director.

Ort, förlag, år, upplaga, sidor
2002. Vol. 65, nr 6
Nyckelord [en]
forced rayleigh-scattering, elastic neutron-scattering, nuclear-magnetic-resonance, studying translational diffusion, pgse nmr, smectic-a, stimulated-echo, molecular-diffusion, nematic phases, constants
Identifikatorer
URN: urn:nbn:se:kth:diva-21700DOI: 10.1103/PhysRevE.65.061701ISI: 000176762500056PubMedID: 12188745Scopus ID: 2-s2.0-41349106122OAI: oai:DiVA.org:kth-21700DiVA, id: diva2:340398
Anmärkning
QC 20100525Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2020-03-10Bibliografiskt granskad

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Dvinskikh, Sergey V.Furo, Istvan

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Physical Review E. Statistical, Nonlinear, and Soft Matter Physics: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

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