Electrohydrodynamics of Hybrid Aligned Nematics

Akhmetshin, O. G.; Delev, V. A.; Scaldin, O. A.

doi:10.1080/10587259508041702

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…The drift direction is determined by the sign of the director gradient along the normal to the NLC layer in the initial hybrid state. The threshold d.c. voltage, wavelength and oblique angle of EC rolls developing on the background of flexoelectric domains are close to that found in low-frequency a.c. electric field where the first instability is to electroconvection (and the flexoeffect plays a small role) [9,10]. With further increase of the d.c. voltage the EC mode suppresses the flexoelectric stripe pattern and a dynamic disordered state (DSM) develops.…”

Section: Resultsmentioning

confidence: 99%

Crossover Between Flexoelectric Stripe Patterns and Electroconvection in Hybrid Aligned Nematics

Delev

Krekhov

Kramer

2001

Molecular Crystals and Liquid Crystals Science and Technology.

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We report experimental and theoretical results on the flexoelectric instability and crossover between flexoelectric domains and electroconvection in a hybrid aligned nematic MBBA under d.c. voltage. At threshold a spatially periodic flexoelectric deformation in the form of longitudinal domains (along the planar director) was observed. With increasing voltage the director deviation out of the initial plane becomes clearly detectable. Observations of tracers show that hydrodynamic flow develops inside the flexoelectric stripe pattern in the form of circular orbits perpendicular to the domain stripes. With further increasing d.c. voltage electroconvection sets in in the form of drifting oblique rolls inside the flexoelectric domains.

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Section: Resultsmentioning

confidence: 99%

Crossover Between Flexoelectric Stripe Patterns and Electroconvection in Hybrid Aligned Nematics

Delev

Krekhov

Kramer

2001

Molecular Crystals and Liquid Crystals Science and Technology.

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“…In comparison with the case of uniform director alignment (planar or homeotropic) only few works were devoted to EC in nematics with more complex director distribution, e.g., in hybrid aligned nematics (HAN) [7,8]. Here below onset the director interpolates from the planar alignment at one confining plate to homeotropic orientation at the other one.…”

Section: Introductionmentioning

confidence: 99%

Drifting Abnormal Rolls in Electroconvection of Hybrid Aligned Nematic

Delev

Krekhov

2001

Molecular Crystals and Liquid Crystals Science and Technology.

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We report experimental and theoretical results on the conductive regime of electroconvection in hybrid aligned nematics. The drifting oblique/normal rolls below/above the Lifshitz frequency are observed at the onset of electroconvection under a.c. voltage. The experimental data on the threshold voltage, wavelength, oblique angle and drift period of the rolls as function of a.c. frequency are in good agreement with the results of linear stability analysis. The transition from drifting oblique rolls to abnormal rolls is found below the Lifshitz frequency with increasing applied voltage.

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Orientational oscillations of stripe patterns induced by frustrated drifts

Schmitz

Zimmermann

1997

Physics Letters A

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Electrohydrodynamics of Hybrid Aligned Nematics

Cited by 6 publications

References 2 publications

Crossover Between Flexoelectric Stripe Patterns and Electroconvection in Hybrid Aligned Nematics

Crossover Between Flexoelectric Stripe Patterns and Electroconvection in Hybrid Aligned Nematics

Drifting Abnormal Rolls in Electroconvection of Hybrid Aligned Nematic

Orientational oscillations of stripe patterns induced by frustrated drifts

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