摘要:

A flexoelectric polarization proportional to the splay deformation is expected in phases with local smectic order, because the alternation of highly polarizable molecular cores with paraffinic tails of lower polarizability produces a spatial modulation of electric fields applied normal to the layers, and the locally inhomogeneous field pushes the permanent quadrupole moment of the core along the field direction, coupling with the splay deformations.

ISSN:1058-725X    

DOI:10.1080/15421409208048695

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

A theoretical treatment of the light deflection of the extraordinary light beam in a nematic liquid crystal in the neighborhood of the Fréedericksz transition is presented. The analysis explains recent experimental observations of director fluctuations near the electrically driven splay Fréedericksz transition. As an application of this method, we propose the measurement of material parameters of a nematic liquid crystal via a spatio-temporal analysis of the measured light intensity.

ISSN:1058-725X    

DOI:10.1080/15421409208048696

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Operation of passive ring mirror and double-conjugation scheme utilizing orientational nonlinearity of nematic liquid crystal is investigated theoretically and experimentally.

ISSN:1058-725X    

DOI:10.1080/15421409208048697

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Results of the experimental study of an azimuthal color contrast in the LC displays employing twisted nematic cells with dichroic dyes of different types are discussed.

ISSN:1058-725X    

DOI:10.1080/15421409208048698

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

A technique for experimental investigation of scattered intensities of LC elements showing dynamic light scattering mode has been developed on the basis of methods of the similarity theory conventionally used for description of blackbody spectral chacteristics.

ISSN:1058-725X    

DOI:10.1080/15421409208048699

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

A room temperature ferroelectric liquid crystal has been studied by means of dielectric measurements. The results of the studies of the complex electric permittivities for aligned samples of different thicknesses and for the different electric measuring fields are presented. We discuss how dielectric properties depend on boundary conditions, thicknesses of the samples and the magnitude measuring electric fields. The obtained experimental results and the discussion make it possible to determine the spontaneous polarization from dielectric measurements.

ISSN:1058-725X    

DOI:10.1080/15421409208048700

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The cholesteric liquid crystal (CLC) pitch and director orientation are obtained as the functions of the anchoring energy W of a director and its pretilt angles Δϑ1, Δϑ2on the cell orienting surfaces. If the anchoring energy is strong enough, the monotonic change of the CLC twisting ability due, for example, to the light-induced molecular conformational transformatins causes jumps of the CLC pitch and mean values of dielectric susceptibility tensor ⟨ϵ1J⟩. Values of Jumps of ⟨ϵ1J⟩ components are determined by anchoring energy W and pretilt angles Δϑ1, Δϑ2that may be used for experimental estimations of W, Δϑ1, Δϑ2.

ISSN:1058-725X    

DOI:10.1080/15421409208048701

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Analytical expressions are obtained for spatial distribution of the director and the order parameter in a spherical nematic droplet as well as for the shift of the phase transition temperature. The cases of small and large values of anchoring are considered

ISSN:1058-725X    

DOI:10.1080/15421409208048702

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:1058-725X    

DOI:10.1080/15421409208048674

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor