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Anisotropic self-diffusion in nematic, smectic-A, and reentrant nematic phases
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0002-6524-1441
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0002-0231-3970
2012 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 86, no 3, 031704- p.Article in journal (Refereed) Published
Abstract [en]

The nature of the reentrant nematic phase has been actively investigated both experimentally and theoretically during the past few decades. Most studies concluded that, as concerning molecular dynamics, a reentrant nematic phase is essentially analogous to a conventional nematic one. Recent computer simulations [Mazza et al., Phys. Rev. Lett. 105, 227802 (2010)], however, predicted molecular translational self-diffusion along the phase director that was dominated by a collective transport mode and was, relative to that observed in a conventional nematic phase, enhanced by an order of magnitude. In the present work, the principal components of the diffusion tensor in a reentrant nematic phase are determined experimentally and compared to those in conventional nematic and smectic-A phases. We find that the temperature dependence of the translational diffusion in the two nematic phases, within experimental error, follows a uniform trend and can be adequately described in terms of available diffusion models in nematics. Hence, we find no evidence for enhanced diffusion but confirm instead the similarity of conventional and reentrant nematic phases with respect to molecular translational dynamics.

Place, publisher, year, edition, pages
2012. Vol. 86, no 3, 031704- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-103364DOI: 10.1103/PhysRevE.86.031704ISI: 000308873500004Scopus ID: 2-s2.0-84866950167OAI: oai:DiVA.org:kth-103364DiVA: diva2:560853
Funder
Swedish Research Council
Note

QC 20121016

Available from: 2012-10-16 Created: 2012-10-11 Last updated: 2017-12-07Bibliographically approved

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Dvinskikh, Sergey V.Furo, Istvan

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