Ferroelectric liquid crystals

Blinov, L. M.; Beresnev, L. A.

doi:10.1070/pu1984v027n07abeh004027

Cited by 39 publications

(12 citation statements)

References 126 publications

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“…11). The values of the pitch in LC1-LC4 compounds coincide with these values in cholesteric mesophase (these values are as~0.1 ÷ 5.0 μm [1,32,68,69]), but are smaller than the values of the pitch in the SmC* mesophase of usual liquid crystals (these values are as~1.0 ÷ 10 μm [36,[70][71][72][73][74]). …”

Section: Romentioning

confidence: 87%

“…As shown in [69][70][71][72][73][74][75][76], depending on the type of liquid crystalline material, the pitch can increase or decrease with an increase of the length of the alkyl chain. As found in the present work, the pitch of (S)-5-alkyloxy-2-[{4-(2-methylbutoxy)phenylimino}methyl]phenol salicylaldimine homologs decreases with an increase of the length of the chain.…”

Section: Romentioning

confidence: 99%

See 1 more Smart Citation

Study of mesomorphism, thermotropic properties and pitch in new chiral smectogenic imine compounds

Nesrullajev

Eran

2015

Journal of Molecular Liquids

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Section: Romentioning

confidence: 87%

Section: Romentioning

confidence: 99%

Study of mesomorphism, thermotropic properties and pitch in new chiral smectogenic imine compounds

Nesrullajev

Eran

2015

Journal of Molecular Liquids

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“…The transition temperatures of CD3 are I 108°C N* 91'8°C SA 71°C S z 49°C K and its pitch in the N* phase is shown in figure 3 (6). The compensation point can be seen to occur at 95.OoC, which is close enough to the SA phase to enable a completely unwound cholesteric phase to be obtained in 3 pm cells.…”

Section: Preliminary Communicationsmentioning

confidence: 90%

“…Finally, it should be noted that mixtures compensated in the S,* phase [6] have too short a pitch in the N* phase for good alignment.…”

Section: Preliminary Communicationsmentioning

confidence: 98%

PRELIMINARY COMMUNICATIONS A novel alignment technique for ferroelectric smectics

Bradshaw¹,

Brimmell²,

Raynes³

1987

Liquid Crystals

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“…The basic phenomenological mechanism for the increase of the optical activity close to the transition is the formation in the isotropic phase of dynamic, coherent regions [4]. These regions have liquid crystalline character that adds a structural contribution to the value of the chirality admittance above the molecular contribution [5,6]. Our purpose is to study and characterize the same effect as a function of applied electric field.…”

Section: Introductionmentioning

confidence: 97%

Field dependence of the optical activity of a chiral liquid crystal near the isotropic–smectic A transition

et al. 1993

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Chiral liquid crystals exhibit molecular optical activity in the isotropic phase. We have studied the evolution of the optical activity as a function of an applied electric field on a 7 6 . 2~ film of the chiral liquid crystal W7, which exhibits an isotropic-smectic A transition at approximately 40°C. We measured the optical activity by recording the rotation of the plane of polarization of an incident linearly polarized ray of light, provided by a He-Ne laser. The applied biasing electric field is parallel to the direction of the incident beam. We find that at 41.0°C, the plane of polarization shifts from -1.1" for an applied voltage of 30 V to a maximum of -4.0" at 70V. The absolute value of the signal decreases beyond this voltage. These shifts are in the direction of the smectic A phase and are in general larger than those observed as a function of temperature. Close to the isotropic-smectic A phase transition, molecules inside the liquid coalesce to form dynamic coherent groups, which have smectic nature. These groups are randomly oriented with respect to each other in the absence of an electric field. The application of an electric field causes the molecules within these groups to align along the direction of the field and to contribute coherently to the optical activity of the system. The way the molecules align with the field depends on the relative values of the polarizability a, which contributes to the alignment of the long axis ofthe molecule, and the dipole moment p, which contributes to the alignment of the short axis of the molecule. Our preliminary results and calculations suggest that for small fields, the electric field couples with the dipole moment p, whereas for fields in excess of 70V, the field couples with the polarizability of the long axis of the molecule, causing a rotational reorientation of the molecules in the isotropic phase. The value of the field at which this reorientation occurs may be controlled by temperature.

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Ferroelectric liquid crystals

Cited by 39 publications

References 126 publications

Study of mesomorphism, thermotropic properties and pitch in new chiral smectogenic imine compounds

Study of mesomorphism, thermotropic properties and pitch in new chiral smectogenic imine compounds

PRELIMINARY COMMUNICATIONS A novel alignment technique for ferroelectric smectics

Field dependence of the optical activity of a chiral liquid crystal near the isotropic–smectic A transition

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