Electroconvection in nematic liquid crystals with positive dielectric and negative conductivity anisotropy

A. Buka, B. Dressel, W. Otowski, K. Camara, T. Tóth-Katona, L. Kramer, J. Lindau, G. Pelzl, W. Pesch

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Electroconvection in an unusual nematic compound with strongly positive dielectric anisotropy and negative anisotropy of the conductivity is investigated. For homeotropic alignment, where one has a direct transition to rolls or squares depending on the frequency of the applied voltage, we present a quantitative theory. From the comparison we infer values for some viscosities, which are rather unusual, but not unreasonable in view of the vicinity of the nematic-smectic transition. For planar alignment, electroconvection sets in above a splay Freedericksz transition with "parallel rolls," which is also captured by the theory.

Original languageEnglish
Article number051713
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume66
Issue number5
DOIs
Publication statusPublished - Nov 2002

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Nematic Liquid Crystal
Conductivity
Anisotropy
liquid crystals
conductivity
anisotropy
Alignment
alignment
Viscosity
Voltage
viscosity
electric potential

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Mathematical Physics

Cite this

Electroconvection in nematic liquid crystals with positive dielectric and negative conductivity anisotropy. / Buka, A.; Dressel, B.; Otowski, W.; Camara, K.; Tóth-Katona, T.; Kramer, L.; Lindau, J.; Pelzl, G.; Pesch, W.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 66, No. 5, 051713, 11.2002.

Research output: Contribution to journalArticle

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AU - Kramer, L.

AU - Lindau, J.

AU - Pelzl, G.

AU - Pesch, W.

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