Publication Title

Physical Review E

Publication Date

10-5-2006

Document Type

Article

DOI

10.1103/PhysRevE.74.041702

Keywords

electric-fields, instability, electroconvection, cells, mbba, scattering, anisotropy, alignment, polymer, regime

Disciplines

Physics

Abstract

The transition from surface to bulk normal dielectric rolls in a nematic liquid crystal is imaged by fluorescence confocal polarizing microscopy. The three-dimensional director structure and the liquid flow are scanned in both the layer plane and the transverse plane. Two systems of small-scale convective flow are formed, one at each electrode. Strong anchoring makes director oscillations difficult and charges accumulate by the Carr-Helfrich mechanism. The middle region is a structureless convection where the director oscillates with the frequency of the applied voltage. The small-scale flow eventually fills the cell from one electrode to the other as one system of thin and elongated rolls. The true dielectric mode is not a director pattern, rather a surface flow instability.

Comments

Copyright 2006 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevE.74.041702


Included in

Physics Commons

Share

COinS