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Article
Magnetic-Field Effect on Periodic Stripe Domains in Nematic Liquid-Crystals
Physical Review E
  • A. Sparavigna
  • Oleg Lavrentovich, Kent State University - Kent Campus
  • A. Strigazzi
Publication Date
1-1-1995
Document Type
Article
DOI
10.1103/PhysRevE.51.792
Keywords
  • focal conic domains,
  • saddle-splay,
  • phase,
  • transition,
  • evolution,
  • constants,
  • curvature,
  • layer
Disciplines
Abstract

Hybrid aligned nematic films placed onto an isotropic fluid substrate exhibit an unusual periodic stripe domain structure that appears only when the thickness of the film is smaller than a few tenths of a micrometer. We investigated the effect of a magnetic field on the threshold between the periodic stripe domains and the aperiodic deformed structure of the director. As experimentally observed, a magnetic field applied along the stripe domains favors a nonperiodic state with the director undistorted in the horizontal plane. The experimental findings are confirmed by a theory that takes into account not only the usual type of the elastic distortions, but also the so-called saddle-splay elasticity. A comparison of the experimental and theoretical data allows one to estimate that the saddle-splay elastic constant K24 is of the same order of magnitude as the bulk elastic constants; this result agrees with independent studies of confined liquid crystal systems.

Comments

Copyright 1995 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevE.51.792

Citation Information
A. Sparavigna, Oleg Lavrentovich and A. Strigazzi. "Magnetic-Field Effect on Periodic Stripe Domains in Nematic Liquid-Crystals" Physical Review E Vol. 51 Iss. 1 (1995) p. 792 - 795
Available at: http://works.bepress.com/oleg_lavrentovich/68/