Electrohydrodynamic instabilities in smectic C

Petroff, Boris P.; Petrov, M.; Simova, P.; Angelov, A.

doi:10.1051/anphys/197803030331

Cited by 25 publications

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“…We also mention early experiments with smectic C liquid crystals, performed in glass cells, with the smectic layers perpendicular or oblique to the glass plates [11], [12]. The observations seem to be very similar to ordinary EHC in nematic cells.…”

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confidence: 56%

Electroconvection in smectic C liquid-crystal films visualized by optical anisotropy

Becker¹,

Ried²,

Stannarius³

et al. 1997

Europhys. Lett.

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Electrohydrodynamic convection due to the Carr-Helfrich (CH) effect has been extensively investigated in nematics. It has been predicted also for freely suspended smectic C and C* films. On the other hand, in smectic A films another type of electroconvection (vortex flow) has been described (Morris S. W., De Bruyn J. R. and May A., Phys. Rev. Lett. 65 (1990) 2378) but is not sufficiently understood by theory so far. We report experiments on freestanding smectic C films in lateral AC electric fields. A convective instability bifurcating continuously from the homogeneous ground state is found. Evidently the mechanism of the instability is of a similar type as in SA. The director field in the convection vortices is directly visualized in the optical texture.

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confidence: 56%

Electroconvection in smectic C liquid-crystal films visualized by optical anisotropy

Becker¹,

Ried²,

Stannarius³

et al. 1997

Europhys. Lett.

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“…Adjusting both the voltage V and the frequency v, we reobserve the low frequency (initial) and the high frequency (fundamental) stripes characteristic of the EHDI in the C phase. As previously described [6] these two EHDI regimes are separated by a critical frequency, v* ~ 45 Hz in our sample.…”

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confidence: 79%

On the origin of electrohydrodynamic instabilities in smectic C liquid crystals

Petrov¹,

Durand²

1981

J. Phyique Lett.

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2014 A l'aide d'observation en lumière polarisée, on montre que les instabilités électrohydrodynamiques des smectiques C résultent d'une déformation de courbure (flexion ou flexion et torsion) de l'orientation moléculaire, couplée à un écoulement périodique confinée dans les plans smectiques. La tension de seuil et la période spatiale des instabilités suivent la même dépendance en fréquence que dans les nématiques. Les instabilités « initiales » et « fondamentales » des smectiques C correspondent aux deux regimes de « conduction » et « diélectrique » des instabilités électrohydrodynamiques des nématiques, provoqués par le même mécanisme de Carr-Helfrich. Abstract. 2014 Using polarized light observation, the electrohydrodynamic instabilities (EHDI) of smectic C liquid crystals are shown to result from a nematic like periodic bend-twist or bend of the molecular director, coupled to a periodic hydrodynamic flow restricted inside the smectic layers. The threshold voltage and spatial period of the instabilities follow the same frequency dependence as for the EHDI in nematics. We propose to explain the « initial » and « fundamental » EHDI of smectic C with the Carr-Helfrich mechanism responsible for the « conduction » and « dielectric » EHDI in nematic liquid crystals.

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“…Rapid cooling of the disordered isotropic phase in this case permits preservation of the disorder (expressed in scattering centres) in the liquid crystal phase. Recently, we have found dynamic scattering with storage in a smectic C phase and in nematics with short range smectic C order [5,6].…”

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Surface memory effect in nematics with smectic C short-range order and hydrogen bonded molecules

Petrov

Tsonev

1996

Liquid Crystals

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To cite this article: Minko P. Petrov & Lyubomir V. Tsonev (1996) Surface memory effect in nematics with smectic C shortrange order and hydrogen bonded molecules, Liquid Crystals, 21:4, 543-555, A surface memory effect (SME) is found in the dimerized nematic with short range smectic C order of 4-n-octyloxybenzoic acid (OOBA) in a cell whose walls have been covered with an obliquely evaporated SiO or I T 0 layer. The recording and erasure processes are discus'sed and erasure in the nematic phase is realized. A mechanism for the surface memorization is presented which takes into account the specific character of dimerized nematics preceding cooling into a smectic C phase.

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Electrohydrodynamic instabilities in smectic C

Cited by 25 publications

References 0 publications

Electroconvection in smectic C liquid-crystal films visualized by optical anisotropy

Electroconvection in smectic C liquid-crystal films visualized by optical anisotropy

On the origin of electrohydrodynamic instabilities in smectic C liquid crystals

Surface memory effect in nematics with smectic C short-range order and hydrogen bonded molecules

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