Ferroelectric Smectic Liquid Crystals Research Articles

A Model Exhibiting Devil's Staircases Pertaining to Ferro- and Antiferroelectric Smectecs

Abstract Phase diagram of the ANNNI model with the third neighbour interaction is obtained to clarify the ferrielectric phases appearing in the sequences of phase transitions of certain ferroelectric smectic liquid crystals. While various mesophases are ferrielectric, those with wave number q = 3/8 and 3/10 come out to exhibit the second order phase transition from antiferroelectric phase to ferrielectric one with decreasing temperature. The phases with q = 4/13 and 4/11 are the candidates for the ferrielectric phases FIH and FIL observed just above and below the SmCy*, respectively.

Coupled Director and Layer Reorientation in Layer Tilted Ferroelectric Smectic Liquid Crystal Cells

Abstract A reversible reorientation of smectic layers in surface stabilized ferroelectric liquid crystal (SSFLC) cells with layer tilted (chevron) geometries was found by electrooptical investigations. The reorientation of the layers superimposes the reorientation of the director along the S* c tilt cone and is suppressed, if the layers are irreversibly fixed in a bookself geometry by high electric fields. Based on a potential density expansion, a dynamical model of a coupled director and layer reorientation is proposed, which leads to excellent agreement with the electrooptical behaviour of the system investigated. The fit of the model to experimental data supplies a simultaneous determination of several material and cell constants. Basic electrooptical parameters, as contrast, switching times and optical overshoot, are reproduced correctly.

Hamiltonian Dynamics of the Landau Model of Ferroelectric Liquid Crystals. I

AbstractA Hamiltonian treatment of the Landau theory of phase transitions is presented. This formulation is based on the analogy between the order parameter space and the ordinary coordinate space of a particle moving in two dimensions. As an application, ferroelectric smectic liquid crystals are considered.

Electrochirally controlled bistable surface switching in nematic liquid crystals

We present an electrically controlled bistable surface switching for nematic liquid crystals, in cells with the usual display geometry. The surface bistability is controlled by means of an electrochiral effect, by doping a nematic with chiral ions. The alternate transient commutation between the two surface states is related to the sign of an applied pulsed electric field. The threshold behavior allows a writing surface time of 32 μs for a field of 21 V/1.3 μm. In the birefringence mode, the optical texture response time is 0.3 ms. The effect, comparable with the one used with ferroelectric smectic liquid crystals, could be used to realize high definition video passive matrix displays.

Electro-optic effects in a ferroelectric liquid crystal mixture

Abstract Recently Ferroelectric chiral smectic (SmC*) liquid crystals have attracted significant attention because of their possible applications as high speed switching devices.l Another electro-optic effect2 was realised by Yoshino and Ozaki in rather a thick cell, which has been termed as transient scattering mode. In the actual use of the liquid crystals, two or three compounds are generally mixed to form a new compound to suit the required conditions, viz., (1) high stability and long life, (2) large spontaneous polarization, (3) ferroelectricity at around room temperature and so on. An attempt has been made to study the electro-optic properties in a ferroelectric liquid crystal mixture, FCS101, which has a smectic C* phase in the temperature range 15-55.4°C.

Intrinsic bending force in anisotropic membranes made of chiral molecules.

A linear term linked to molecular chirality occurs in the bending energy of membranes with C/sub 2/ or D/sub 2/ symmetry. We find it to alternate in sign, depending on the direction of a cylindrical curvature, and discuss consequences for anisotropic solid membranes, tilted fluid bilayers, and ferroelectric smectic liquid crystals.

A Method for Molecular Alignment of Ferroelectric Smectic Liquid Crystal: Combination of Metal Oxide Thin Film and Electric Field

A method for molecular alignment of a ferroelectric smectic liquid crystal is reported. Homeotropic alignment with a small angle of pretilt was obtained by surface treatment with oblique deposition of metal oxide, such as yttria and alumina. Furthermore, an electric field was applied during the cooling period from isotropic liquid to chiral smectic phase. Uniformly pretilted alignment could be obtained by using the oblique deposition and DC field application. On the other hand, a twisted alignment was obtained on the obliquely deposited metal oxide film when an AC electric field was applied instead of a DC field. Electrooptical characteristics of these cells are shown.

Measurement of spontaneous polarization in ferroelectric smectic liquid crystals

Abstract This paper presents measurements of spontaneous polarization made on two ester-bridged materials (SCE1 and CE8). The two materials are chosen to be representative of long pitch (SCE1) and short pitch (CE8) materials. The measurements were made by two different methods, Diamant bridge and field reversal; these methods are compared and the results shown to be in good agreement. The variation in results between different samples of these materials is discussed and the results compared (where possible) with the work of other authors. Special attention is paid to the variation which occurs between the published spontaneous polarization measurements of different authors. The reasons for this variation are examined and variation in sample alignment and the determination of the transition temperature by different authors are shown to be major causes.

ChemInform Abstract: A Promising Material for Liquid Crystal Displays (LCD): Ferroelectric Smectic Liquid Crystals (FLC)

Chemischer InformationsdienstVolume 17, Issue 51 Reviews ChemInform Abstract: A Promising Material for Liquid Crystal Displays (LCD): Ferroelectric Smectic Liquid Crystals (FLC) C. ESCHER, C. ESCHERSearch for more papers by this author C. ESCHER, C. ESCHERSearch for more papers by this author First published: December 23, 1986 https://doi.org/10.1002/chin.198651366Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume17, Issue51December 23, 1986 RelatedInformation

ChemInform Abstract: Helical Twist and Spontaneous Polarization Direction in Ferroelectric Smectic Liquid Crystals.

Chemischer InformationsdienstVolume 17, Issue 50 Physical Organic Chemistry ChemInform Abstract: Helical Twist and Spontaneous Polarization Direction in Ferroelectric Smectic Liquid Crystals. J. W. GOODBY, J. W. GOODBYSearch for more papers by this authorE. CHIN, E. CHINSearch for more papers by this author J. W. GOODBY, J. W. GOODBYSearch for more papers by this authorE. CHIN, E. CHINSearch for more papers by this author First published: December 16, 1986 https://doi.org/10.1002/chin.198650053Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume17, Issue50December 16, 1986 RelatedInformation

ChemInform Abstract: Helical Twist Sense and Spontaneous Polarization Direction in Ferroelectric Smectic Liquid Crystals.

ChemInform Abstract: Helical Twist Sense and Spontaneous Polarization Direction in Ferroelectric Smectic Liquid Crystals.

Helical twist and spontaneous polarization direction in ferroelectric smectic liquid crystals. 2

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHelical twist and spontaneous polarization direction in ferroelectric smectic liquid crystals. 2J. W. Goodby and E. ChinCite this: J. Am. Chem. Soc. 1986, 108, 16, 4736–4742Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 August 1986https://doi.org/10.1021/ja00276a009RIGHTS & PERMISSIONSArticle Views167Altmetric-Citations58LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (794 KB) Get e-Alerts Get e-Alerts

Helical twist sense and spontaneous polarization direction in ferroelectric smectic liquid crystals. 1

Helical twist sense and spontaneous polarization direction in ferroelectric smectic liquid crystals. 1

Synthesis and Mesomorphysm of Some New Ferro-Electric Smectic Liquid Crystals

In this work, compounds having the general formula: with (X = H, Br, CN, Cl) and (R1 (or/and) R2 = 3-methylhexyl or 2-methyl-butyl, n-alkyl were prepared and their phase transition temperatures and...

Phase diagram of ferroelectric liquid crystals in an external magnetic field

Abstract The phase diagram of the ferroelectric smectic liquid crystal DOBAMBC in an external magnetic field H is analysed and the transition temperatures between the disordered Sm A, helicoidal Sm C* and homogeneously ordered Sm C phase are determined as functions of H by laser light diffraction measurements. Sm C* - Sm C transition line shows close to the transition temperature an anomalous behaviour of a similar character as the pitch of the helix. Both anomalies can be qualitatively explained by a non-linear coupling between the transverse polarization of molecules and their tilt from the normal to smectic layers.

Temperature dependence of the pitch of the helix in a chiral ferroelectric smectic liquid crystal

Abstract The temperature dependence of the helical pitch in the ferroelectric liquid crystal DOBAMBC near the C*-A transition (T c ) has been measured with a high temperature resolution. The pitch strongly decreases with temperature near the transition but reaches a finite value at T c. The consistency of the data with different theoretical models is studied.

Synthesis, properties and applications of ferroelectric smectic liquid crystals

Abstract Although smectic liquid crystals containing an optically active center were first prepared over fifty years ago, it was only recently realized that a number of these materials were ferroelectrics. Smectic phases which exhibit ferroelectric properties have structures in which their optically active molecules have their long axes tilted with respect to the layer planes of the phase. Smectics C*, I*, F*, J*, and G* have these properties.

Electrical and Optical Properties of Ferroelectric Smectic Liquid Crystal and Their Application III

Ferroelectricity in the smectic-C phase of two series of compounds (L-DOBACPC series and D-DOBAMBC series) are studied and discussed in terms of their molecular structures. Bistable memory effect in the smectic-C phase and an electro-optical effect in the smectic-H phase are studied.

Colour Switching in Ferroelectric Smectic Liquid Crystal by Electric Field

Colour Switching in Ferroelectric Smectic Liquid Crystal by Electric Field