Dynamics of disordered patterns in electroconvection of homeotropically aligned nematic liquid crystals

P. Tóth, A. Buka, J. Peinke, L. Kramer

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We report on experiments in nematics with homeotropic alignment where the electrohydrodynamic instability occurs after a bend Freedericksz transition. The threshold of convection, the wave number at onset, and the threshold for the transition between order and disorder in the presence of a stabilizing magnetic field agree with theory. Whereas in the oblique-roll range the behavior of the correlation time of the disordered state exhibits near onset the expected scaling behavior, the disordered state in the normal-roll range at zero magnetic field shows no dynamics below a well-defined value εs of the reduced control parameter, in contrast to theoretical predictions. At εs one has reproducibly a continuous and reversible transition to a dynamic state. We attribute these features to the appearance of chevronlike structures.

Original languageEnglish
Pages (from-to)1983-1991
Number of pages9
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume58
Issue number2 SUPPL. B
Publication statusPublished - Aug 1998

Fingerprint

Nematic Liquid Crystal
liquid crystals
Magnetic Field
Electrohydrodynamics
electrohydrodynamics
thresholds
Scaling Behavior
Oblique
magnetic fields
Range of data
Control Parameter
Convection
Well-defined
Disorder
Alignment
convection
alignment
Attribute
disorders
scaling

ASJC Scopus subject areas

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

Cite this

Dynamics of disordered patterns in electroconvection of homeotropically aligned nematic liquid crystals. / Tóth, P.; Buka, A.; Peinke, J.; Kramer, L.

In: Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Vol. 58, No. 2 SUPPL. B, 08.1998, p. 1983-1991.

Research output: Contribution to journalArticle

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