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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, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-6524-1441
KTH, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-0231-3970
2001 (Engelska)Ingår i: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 115, nr 4, s. 1946-1950Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2001. Vol. 115, nr 4, s. 1946-1950
Nyckelord [en]
studying translational diffusion, multiple-pulse nmr, pgse nmr, stimulated-echo, scattering, dynamics, water, tool
Identifikatorer
URN: urn:nbn:se:kth:diva-20780ISI: 000169800000035OAI: oai:DiVA.org:kth-20780DiVA, id: diva2:339477
Anmärkning
QC 20100525Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Dvinskikh, Sergey V.Furo, Istvan

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