Relaxation Dynamics of Ferroelectric Liquid Crystals in Pulsed Electric Field

Kudreyko, Aleksey; Migranov, N. G.; Migranova, D. N.

doi:10.1007/s11182-016-0857-x

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…The application of a square-wave electric field [4] with amplitudes up to 1 V • μm to the SmC* phase causes an irreversible structural transition, so that if the electric field is off, the texture does not return to its initial state. This effect would be further enhanced by improving preparation of cells and decreasing the gap between substrates.…”

Section: Resultsmentioning

confidence: 99%

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Observation of macro-heterogeneities in surface-stabilized smectic C* with antagonistically patterned substrates

Kudreyko¹,

Song²,

Migranova³

2017

LoM

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East Economic-Legal Humanitarian Academy, Mendeleeva st., 215 / 4, Ufa, 450071, RussiaIn our recent study, we considered equilibrium states in a monolayered sample of ferroelectric liquid crystal in smectic C* phase confined between two differently patterned substrates with strong anchoring under the applied electric field. By using the continuum theory for a "bookshelf " aligned sample for smectic C*, we derived an elliptic sine-Gordon equation. It was shown that due to the antagonistic boundary conditions at the substrates, competing boundary effects in the thin film generate a stable alignment of the smectic C* director. This alignment can be controlled by the electric field. The result obtained was explained basing on Frenkel-Kontorova's model, which was used to describe the map of the director alignment as the system of harmonically coupled "atoms" with the external potential produced by the substrates. In this study, we perform an experiment to verify our theoretical results. We prepared a cell with differently patterned substrates, and ferroelectric liquid crystal material CS-1024 (Chisso Co.) was injected into the empty cell by the capillarity flow. Patterned monolayers promoting planar alignment of CS-1024 in its smectic C* phase were created using microcontact printing of functionalized organothiols on gold films. By patterning the surface with planar alignment of monolayers, the location and formation of smectic C* director macro-heterogeneities can be controlled by the electric field. The observed macro-heterogeneities continue to exist when the electric field is turned off. Polarizing microscopy and fluorescent microscopy were used to observe the formation of macro-heterogeneities in the alignment of SmC* director field.

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Section: Resultsmentioning

confidence: 99%

“…Referring to the previously obtained results [2,4], the present study is devoted to the experimental estimation of the continuum approach for bookshelf aligned SmC* LCs, confined between two differently patterned substrates. Fig.…”

Section: Introductionmentioning

confidence: 98%

Observation of macro-heterogeneities in surface-stabilized smectic C* with antagonistically patterned substrates

Kudreyko¹,

Song²,

Migranova³

2017

LoM

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Chaotic transients in surface-stabilized smectic C* cells induced by magnetic field

Kudreyko

Migranov

2018

Soft Materials

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Frequency voltage controlled light transmittance in ferroelectric liquid crystal cells

et al. 2017

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Light transmittance of a short-pitch deformed-helix ferroelectric liquid crystal cell was numerically studied when low and high voltage frequencies ([Formula: see text] kHz and [Formula: see text] kHz, respectively) are applied to the cell. The reported finding in the decay of light transmittance at increasing frequency is obtained due to reasonable simplifications of the temporal dependence of director's azimuthal angle. By taking experimentally known data, we numerically demonstrate that the increase in temperature of ferroelectric liquid crystals yields an insignificant change of light transmittance within all visible spectra.

show abstract

Relaxation Dynamics of Ferroelectric Liquid Crystals in Pulsed Electric Field

Cited by 4 publications

References 8 publications

Observation of macro-heterogeneities in surface-stabilized smectic C* with antagonistically patterned substrates

Observation of macro-heterogeneities in surface-stabilized smectic C* with antagonistically patterned substrates

Chaotic transients in surface-stabilized smectic C* cells induced by magnetic field

Frequency voltage controlled light transmittance in ferroelectric liquid crystal cells

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