Inversion walls in homeotropic nematic and cholesteric layers

Gilli, J. M.; Thiberge, Stephan Y.; Vierheilig, A.; Fried, Floyd A.

doi:10.1080/026782997207894

Cited by 21 publications

(29 citation statements)

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“…Cet univers est la texture nématique métastable, dite pseudo-planaire, étudiée auparavant par J.M. Gilli et al [4]. Pour commencer nous allons montrer comment, contrairement aux idées reçues, on peut rendre sa durée de vie pratiquement infinie.…”

Section: Défauts Topologiquesunclassified

“…L'explication de ce phénomène est simple et elle était connue de J.M. Gilli et al [4]. Dans le bilan énergétique de la cellule où les deux textures coexistent (figures 1 a, b et c), il faut tenir compte non pas d'une mais de deux contributions.…”

Section: Surprises Ou « Le Diable Est Dans Les Détails »unclassified

“…La longueur d'onde ξ de la texture pseudoplanaire enroulée joue alors un rôle analogue à celui de la longueur d'onde de de Broglie λ = h/(mv) pendant les collisions de neutrons lents avec des noyaux atomiques [6]. ❚ [4]. La mise en forme de l'article doit beaucoup aux remarques éclairées des rapporteurs, ainsi qu'au concours généreux de C. de Novion, J.P. Hulin et M. Leduc, que je tiens à remercier très chaleureusement.…”

Section: Annihilation Des Paires Monopôle-antimonopôleunclassified

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Cristaux liquides : l’univers métastable des monopôles nématiques

Pierański

2017

Reflets phys.

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Section: Défauts Topologiquesunclassified

Section: Surprises Ou « Le Diable Est Dans Les Détails »unclassified

Section: Annihilation Des Paires Monopôle-antimonopôleunclassified

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Cristaux liquides : l’univers métastable des monopôles nématiques

Pierański

2017

Reflets phys.

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“…Various external effects and boundary conditions lead to the structural transformations and to a change of texture types in their mesophases. However the high sensitivity of LC leads to an appearance of various defective formations, different disclination and defect types in their oriented textures [1][2][3][4]. These disclinations and defects promote a deterioration of the technical parameters of LC devices and lead also to a shortening of their duration.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of inversion walls and singular points in oriented textures of nematic mesophase

Nesrullajev¹

2009

Cryst. Res. Technol.

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In this work the nature and peculiarities of the inversion walls and singular points, which can spontaneously arise or can be stimulated in the homeotropic and planar oriented textures of the thermotropic nematogens, have been investigated for large temperature interval. The interaction force and mean approach velocity of the singular points, having opposite optical sign, have been calculated. The optical mappings and sketches of the inversion walls and singularities, taking place in the oriented textures of the nematogens, are presented.

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“…Typical minimal volume of LC with definite value of director possesses is ~ (10l) 3 where l is length of LC molecule [14] (l=2.3 nm for 5CB host). Therefore volume with (23) 3 nm 3 is enough for definition of n(r). This moment is one of the central for understanding of new fine features of LC host with nanocomposite.…”

Section: Lc Carbon Nanocompositesmentioning

confidence: 99%

Fine topological structure of coherent complex light created by carbon nanocomposites in LC

Ponevchinsky¹,

Goncharuk

Minenko

et al. 2012

SPIE Proceedings

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Fine complex light structure, optical singularities and electroconductivty of nematic 5CB doped by multi-walled carbon nanotubes (MWCNTs) were investigated. MWCNTs gather spontaneously to system of micro scale clusters with random fractal borders at small enough concentration. They are surrounded by the striped micro scale cladding which creates optical singularities in propagating laser beam. Applied transverse electric field above the Freedericksz initiates homeotropic arrangement of 5CB and the striped inversion walls between nanotubes clusters what diminishes free energy of a composite. Theory of their appearance and properties was built. Simultaneously the striped cladding disappears what can be treated as new mechanism of structure orientation nonlinearity in nonlinear photonics. Polarization singularities (circular C points) were measured firstly. Percolation of clusters enhances strongly electrical conductivity of the system and creates inversion walls even without applied field. Carbon nanotubes composites in LC form bridge between nano dopants and micro/macro system and are promising for applications. Elaborated protocol of singular optics inspection and characterization of LC nanocomposites is promising tool for applications in modern nanosience and technique.

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Inversion walls in homeotropic nematic and cholesteric layers

Cited by 21 publications

References 0 publications

Cristaux liquides : l’univers métastable des monopôles nématiques

Cristaux liquides : l’univers métastable des monopôles nématiques

Peculiarities of inversion walls and singular points in oriented textures of nematic mesophase

Fine topological structure of coherent complex light created by carbon nanocomposites in LC

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