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Electroconvection and Pattern Formation: In Nematic Liquid Crystals - Couverture souple

Acharya, Gyanu

 
9783639214802: Electroconvection and Pattern Formation: In Nematic Liquid Crystals
Couverture souple
ISBN 10 : 3639214803 ISBN 13 : 9783639214802
Editeur : VDM Verlag Dr. Müller, 2010

Synopsis

Electrohydrodynamic convection (EHC) in nematic liquid crystals is a crucial model system for the study of spontaneous, non-equilibrium pattern formation in anisotropic systems. To characterize the EHC patterns, I have utilized two nematic samples: 4-ethyl-2-fluoro-4'-[2-(trans-4-n-pentylcyclohexyl)-ethyl]-biphenyl (I52) and a mixture of 65 wt.-% p-butyl-p'-methoxy-azoxybenzene and 35 wt.-% p-ethyl-p'-methoxy-azoxybenzene (Phase 5), filled in standard planar cell. In I52, over certain range of the conductivity, the initial transition leads to two families of counter-propagating oblique modes that loose stability at onset. These experimental observations are in agreement with the standard model and weak electrolyte model of electroconvection. To study spatiotemporal chaos (STC), four-envelopes of the pattern are extracted by applying 2D spatial and 1D temporal Fourier transform. The temporal variation of the amplitudes of these envelopes is chaotic in space and time. In Phase 5, I observed oblique stationary (OS) modes at lower frequencies and normal traveling (NT) modes at higher frequencies resulting discontinuous jump in the Hopf frequency.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Présentation de l'éditeur

Electrohydrodynamic convection (EHC) in nematic liquid crystals is a crucial model system for the study of spontaneous, non-equilibrium pattern formation in anisotropic systems. To characterize the EHC patterns, I have utilized two nematic samples: 4-ethyl-2-fluoro-4'-[2-(trans-4-n-pentylcyclohexyl)-ethyl]-biphenyl (I52) and a mixture of 65 wt.-% p-butyl-p'-methoxy-azoxybenzene and 35 wt.-% p-ethyl-p'-methoxy-azoxybenzene (Phase 5), filled in standard planar cell. In I52, over certain range of the conductivity, the initial transition leads to two families of counter-propagating oblique modes that loose stability at onset. These experimental observations are in agreement with the standard model and weak electrolyte model of electroconvection. To study spatiotemporal chaos (STC), four-envelopes of the pattern are extracted by applying 2D spatial and 1D temporal Fourier transform. The temporal variation of the amplitudes of these envelopes is chaotic in space and time. In Phase 5, I observed oblique stationary (OS) modes at lower frequencies and normal traveling (NT) modes at higher frequencies resulting discontinuous jump in the Hopf frequency.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
VDM Verlag Dr. Müller
Date d'édition
2010
Langue
anglais
ISBN 10 
3639214803
ISBN 13 
9783639214802
Reliure
Broché
Nombre de pages
236
Coordonnées du fabricant
non disponible
Personne responsable
non disponible