Zigzag instability of a chi disclination line in a cholesteric liquid crystal

Abstract : We studied the formation of chi disclination lines in planar cholesteric samples placed in a temperature gradient near the cholesteric to smectic A phase transition. We observed that the first simple line which forms close to the smectic-cholesteric front zigzags when it is perpendicular to the direction of planar anchoring and is straight for other orientations. This instability is similar to Herring instability for crystalline surfaces. We show numerically that it originates from a strong increase of the elastic anisotropy close to the transition. In addition, we propose a new method to measure the pitch divergence at the smectic to cholesteric phase transition.
Type de document :
Article dans une revue
European Physical Journal E: Soft matter and biological physics, EDP Sciences: EPJ, 2006, 19 (4), pp.489-500
Liste complète des métadonnées

Littérature citée [18 références]  Voir  Masquer  Télécharger

https://hal-ens-lyon.archives-ouvertes.fr/ensl-00182727
Contributeur : Patrick Oswald <>
Soumis le : vendredi 26 octobre 2007 - 19:53:29
Dernière modification le : jeudi 19 avril 2018 - 14:54:03
Document(s) archivé(s) le : lundi 12 avril 2010 - 00:50:52

Fichier

Dequidt-oswald06.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

  • HAL Id : ensl-00182727, version 1

Collections

Citation

Alain Dequidt, Patrick Oswald. Zigzag instability of a chi disclination line in a cholesteric liquid crystal. European Physical Journal E: Soft matter and biological physics, EDP Sciences: EPJ, 2006, 19 (4), pp.489-500. 〈ensl-00182727〉

Partager

Métriques

Consultations de la notice

81

Téléchargements de fichiers

85