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Local Frederiks transitions near a solid/nematic interface

Journal de physique. Lettres, 1975-01, Vol.36 (10), p.255-258

Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0302-072X ;DOI: 10.1051/jphyslet:019750036010025500

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Title:
Local Frederiks transitions near a solid/nematic interface
Author: Dubois-Violette, E. ; De Gennes, P.G.
Subjects: 6130 ; 6470M ; conical homeotropic transitions ; direct steric effect ; Frederiks transitions ; homeotropic alignment ; interface phenomena ; liquid crystal phase transformations ; local transitions ; long range van der Waals torques ; Physics ; Physics archives ; planar alignment ; planar conical transitions ; solid nematic surface
Is Part Of: Journal de physique. Lettres, 1975-01, Vol.36 (10), p.255-258
Description: We consider a solid/nematic interface where long range van der Waals torques favor homeotropic alignment, while a direct steric effect tends to induce a planar alignment. Depending on the relative strength of the two contributions, one may find two transitions : planar ↔ conical and conical ↔ homeotropic. This is reminiscent of recent observations by Ryschenkow and Kléman on glass surfaces coated with carbon black. Similar local Frederiks transitions could occur by competition between two distinct planar arrangments. On considère un interface solide-nématique près duquel les couples de van der Waals favorisent un type d'alignement (par exemple homéotrope) alors que les interactions stériques au contact tendent à donner un autre type (par exemple planaire). En faisant varier le rapport des deux forces impliquées, on peut rencontrer deux transitions : planaire ↔ conique ↔ homéotrope. Ceci rappelle certaines observations récentes de Ryschenkow sur des surfaces de verre recouvertes de noir de fumée.
Publisher: EDP Sciences
Language: English
Identifier: ISSN: 0302-072X
DOI: 10.1051/jphyslet:019750036010025500
Source: Hyper Article en Ligne (HAL) (Open Access)
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Local Frederiks transitions near a solid/nematic interface

Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0302-072X ;DOI: 10.1051/jphyslet:019750036010025500

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