Document Detail


Electroconvection in nematics above the splay Fréedericksz transition.
MedLine Citation:
PMID:  17767374     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
We present a basic model for an instability leading to a novel type of electroconvection patterns observed above the splay Fréedericksz transition in nematics. Such patterns, with wave vector perpendicular to the director easy axis, are found in planar sandwich cells under crossed polarizers, they do not produce shadowgraph images at onset. An adaptation of the classical Carr Helfrich mechanism is introduced. The ground state is a tilted director field uniform in the cell plane. The proposed mechanism destabilizes this director field and leads to a structure with modulated out-of-plane (twist) deformations. Experimental confirmation is provided by polarizing microscopy. All experimental observations are qualitatively explained with the proposed model.
Authors:
R Stannarius; J Heuer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-09-03
Journal Detail:
Title:  The European physical journal. E, Soft matter     Volume:  24     ISSN:  1292-8941     ISO Abbreviation:  Eur Phys J E Soft Matter     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-09-28     Completed Date:  2007-12-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101126530     Medline TA:  Eur Phys J E Soft Matter     Country:  France    
Other Details:
Languages:  eng     Pagination:  27-33     Citation Subset:  -    
Affiliation:
Otto-von-Guericke Universität Magdeburg, Institut für Experimentelle Physik, D-39106 Magdeburg, Germany. ralf.stannarius@physik.uni-magdeburg.de
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