A model describing the rubbing energy dependence of the pretilt angle in nematic liquid crystals

A model describing the rubbing energy dependence of the pretilt angle in nematic liquid crystals

The dependence of the nematic liquid-crystal (LC) pretilt angle on the applied rubbing energy was measured for two commercially available polyimide alignment materials. The rubbed polyimide is described in terms of an oriented top layer and an isotropic bottom layer. The rubbing energy was quantifie...

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Veröffentlicht in:Japanese Journal of Applied Physics 1997-03, Vol.36 (3A), p.1185-1190
Hauptverfasser: CNOSSEN, G, LAGARDE, F. N, VAN AERLE, N. A. J. M
Format: Artikel
Sprache:eng
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Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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container_end_page 1190
container_issue 3A
container_start_page 1185
container_title Japanese Journal of Applied Physics
container_volume 36
creator CNOSSEN, G
LAGARDE, F. N
VAN AERLE, N. A. J. M
description The dependence of the nematic liquid-crystal (LC) pretilt angle on the applied rubbing energy was measured for two commercially available polyimide alignment materials. The rubbed polyimide is described in terms of an oriented top layer and an isotropic bottom layer. The rubbing energy was quantified by the thickness of the top layer oriented by rubbing. This thickness was revealed by optical retardation measurements. A close correlation was found between the pretilt angle of the LC and the rubbing-oriented top layer thickness. The resulting anchoring properties are explained in terms of van-der-Waals interactions between the LC molecules and both the oriented polyimide top layer and the isotropic polyimide bottom layer. A prediction for the rubbing-energy dependence of the polar anchoring energy follows from the theory.
doi_str_mv 10.1143/JJAP.36.1185
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subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
title A model describing the rubbing energy dependence of the pretilt angle in nematic liquid crystals
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