Publication Title

Physical Review Letters

Publication Date

8-15-1994

Document Type

Article

DOI

10.1103/PhysRevLett.73.979

Keywords

focal conic domains, liquid-crystals, free-energy, elastic-constant, curvature, transition, layer

Disciplines

Physics

Abstract

To verify the status of the divergence K13 term in the elastic theory of liquid crystals we study submicron films placed onto an isotropic fluid substrate in the Langmuir trough (Langmuir liquid crystal, LLC). The upper and lower surfaces favor normal and tangential molecular orientation, respectively. The periodic domain phase is observed in a nematic LLC. The dependence of the periodicity L of the domains vs film thickness h can be explained only if the elastic energy is accompanied by divergence terms with nonzero constants K13 and K24. It is found that for 5CB K13 almost-equal-to -0.2K11.

Comments

Copyright 1994 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.73.979


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