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Domain structure in an unoriented lamellar lyotropic liquid crystal phase studied by H-2 NMR
KTH, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-6524-1441
KTH, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-0231-3970
2001 (Engelska)Ingår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 17, nr 21, s. 6455-6460Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The spatial variation of the phase director in an unoriented lamellar lyotropic liquid crystal is investigated by H-2 two-dimensional and one-dimensional exchange and PGSE NMR. Exchange NMR probes the single-particle orientational correlation function of D2O molecules that diffuse among regions with different director orientations. The obtained correlation time and the water diffusion coefficient, measured by H-2 PGSE NMR, provide the persistence length of director orientation that is defined as domain size. The nature of spatial variation is revealed by the decay of the H-2 stimulated echo signal recorded with different evolution times. The persistence length of the director is found to be strongly dependent on the rate of cooling the sample from its isotropic phase.

Ort, förlag, år, upplaga, sidor
2001. Vol. 17, nr 21, s. 6455-6460
Nyckelord [en]
nuclear-magnetic-resonance, solid-state nmr, pentadecafluorooctanoate-water-system, polydomain-monodomain transition, angle neutron-scattering, deuteron spin alignment, focal conic domains, 2-dimensional exchange, self-diffusion, reorientational dynamics
Identifikatorer
URN: urn:nbn:se:kth:diva-21021DOI: 10.1021/la010693cISI: 000171602500013Scopus ID: 2-s2.0-0035900137OAI: oai:DiVA.org:kth-21021DiVA, id: diva2:339718
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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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