Dielectric behavior at the smectic-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">C</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">*</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>–chiral-nematic phase transition of a ferroelectric liquid crystal

Hiller, S.; Am, Biradar; Wróbel, S.; Haase, Wolfgang

doi:10.1103/physreve.53.641

Cited by 82 publications

(34 citation statements)

References 19 publications

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“…The dielectric permittivity acquired at 95°C (during ferroelectric phase), varies with frequency. The change in the bias voltage of measuring field from 0 to 4 V makes the dielectric permittivity decline to a minimum, which is a result of the suppression of phason (Goldstone) mode related to phase fluctuation of the molecules [9]. Again on applying 0 V bias the permittivity appears in an intermediate state between curves with bias different from zero and initial condition before applying bias.…”

Section: Results With W129 Liquid Crystalmentioning

confidence: 99%

“…The shift in the frequency for the Soft mode indicates a change in the relaxation time for the reorientation of the molecules of the LC components, while the shift in the frequency for the Goldstone mode indicates a more or less rapid phase fluctuation in the azimuthal orientation of the director. This variation in frequency with the addition of gold nanoparticles may be due to the change in rotational viscosity [9].…”

confidence: 99%

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Comparisons on Different Liquid Crystals Doped with Various Sized Gold Nanoparticles for Nonvolatile Memory Effects

Marino¹

2017

NSTOA

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Section: Results With W129 Liquid Crystalmentioning

confidence: 99%

Comparisons on Different Liquid Crystals Doped with Various Sized Gold Nanoparticles for Nonvolatile Memory Effects

Marino¹

2017

NSTOA

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“…For the 2-OC compound in the N* phase, one relaxation process was recognized and its linear temperature dependence suggests that it is due to the same mechanism as the soft mode in the SmA* phase fluctuations of the amplitude of the order parameters [5][6][7].…”

Section: Discussionmentioning

confidence: 99%

Dielectric relaxation behaviour of liquid crystals with opposite orientation of -COO ester group in molecular core

Rutkowska

Perkowski

Piecek

et al. 2008

Opto-Electronics Review

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Dielectric measurements were performed for two smectogens, being structurally analogous with the opposite space orientation of the-COO ester group in the molecular core, using a HP4192A impedance analyser. Gold coated electrode cells of different thicknesses were used. Temperature dependences of the relaxation frequency fR and the inverse of the dielectric strength Δε′┴ −1 obtained by fitting experimental values of perpendicular components, i.e., the real ε′┴ and the imaginary ε″┴ parts of the complex dielectric permittivity to the Cole-Cole equation as well as the investigation of modification of relaxation processes under bias were determined for the SmC*, SmA*, and N* phases of studied compounds. One can conclude, on the basis of the above results, that dielectric relaxation processes observed by us in the studied compounds are similar to those of the soft and Goldstone mode typically observed by others in the SmC*, SmA*, and N* phases. It is concluded from acomparison of their properties with other related compounds that the link between the biphenyl moiety and-COO ester group is closely related to the stability of smectic phases.

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“…As can be seen from the figure, with the change in bias voltage of measuring field from 0 to 10 V, the permittivity value decreases to minimum due to the suppression of phason ͑Goldstone͒ mode, which occurs due to phase fluctuation of the molecules. 27 Again on applying 0 V bias, the dielectric permittivity appears the same as in the presence of bias, meaning thereby, the glycerol/DHFLC mixture remains in memory state up to some extent. Figure 5 shows the electrical response of glycerol/ DHFLC mixture.…”

Section: B Memory Effect In Glycerol/dhflc Mixturementioning

confidence: 99%

Dielectric and electro-optical studies of glycerol/ferroelectric liquid crystal mixture at room temperature

Kumar

Prakash

Choudhary

et al. 2009

Journal of Applied Physics

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The optical memory effect based on glycerol mixed deformed helix ferroelectric liquid crystal ͑DHFLC͒ material has been investigated. The observed memory effect has also been compared with the glycerol mixed ferroelectric liquid crystals ͑FLCs͒. The observance of memory effect has been verified by experimental data using dielectric spectroscopy, electro-optical, and textural studies under polarizing optical microscope. The glycerol not only helps to improve the memory effect in DHFLC material but also alters the physical parameters such as rotational viscosity, spontaneous polarization, response time, etc. too in both glycerol/DHFLC and glycerol/FLC mixtures.

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Dielectric behavior at the smectic-C*–chiral-nematic phase transition of a ferroelectric liquid crystal

Cited by 82 publications

References 19 publications

Comparisons on Different Liquid Crystals Doped with Various Sized Gold Nanoparticles for Nonvolatile Memory Effects

Comparisons on Different Liquid Crystals Doped with Various Sized Gold Nanoparticles for Nonvolatile Memory Effects

Dielectric relaxation behaviour of liquid crystals with opposite orientation of -COO ester group in molecular core

Dielectric and electro-optical studies of glycerol/ferroelectric liquid crystal mixture at room temperature

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