Vortex flow in freestanding smectic films driven by elastic relaxation of the c director

Phys Rev Lett. 2006 Sep 1;97(9):097802. doi: 10.1103/PhysRevLett.97.097802. Epub 2006 Aug 29.

Abstract

We report a simple experiment in freestanding smectic films in which elastic distortions of the c director drive macroscopic flow. The flow field is visualized with tracer particles. Measurements are compared to predictions of a model that employs the coupled dynamic equations for director and velocity fields. Relaxation dynamics depends on the topology of the film center: for defect-free target patterns, shear flow provides the dominating contribution to the c director dynamics. In presence of a central topological defect of strength S = + 1, the influence of flow on the relaxation dynamics is practically negligible, while for a central S = - 1 defect, the influence of vortex flow on the c-director relaxation is roughly twice as large as for the defect-free state.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Algorithms
  • Anisotropy
  • Elasticity
  • Electromagnetic Fields
  • Liquid Crystals / chemistry*