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Dielectric Properties of Ferroelectric Liquid Crystals with Diversified Molecular Structure

100%
Czerwiec J., Dąbrowski R., Żurowska M., Ziobro D., Wróbel S.
Acta Physica Polonica A
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2010
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vol. 117
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issue 4
553-556
EN
Mesomorphic, thermodynamic, electro-optic and dielectric properties of three homologues of fluorosubstituted esters are described. Full chemical names of these compounds are as follows: (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-penta-fluoro-propano-ynloxyhex-1-oxy)-biphenyl-4-yl (in short 2F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-nona-fluoro-pentano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 4F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-trideca-fluoro-heptano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 6F6BBiOC8). The compounds exhibit ferroelectric smectic C* phase between crystalline and isotropic phase. Only one compound (6F6BBiOC8) shows antiferroelectric phase (SmC*_{A}) observed by dielectric spectroscopy, but the range of this phase is narrow of about 2°. All three compounds exhibit in the SmC* phase Goldstone mode and Maxwell-Wagner relaxation hidden in the conductivity contribution at low frequencies, whereas in the SmC* _{A} phase two anti-ferroelectric modes (AFM1) and (AFM2) contribute to the dielectric spectrum. The compounds were studied using differential scanning calorimetric, frequency domain dielectric spectroscopy, and reversal currents method to determine spontaneous polarization.
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Dielectric Properties of Ferroelectric Liquid Crystals with Diversified Molecular Structure - ERRATUM

100%
Czerwiec J., Dąbrowski R., Żurowska M., Ziobro D., Wróbel S.
Acta Physica Polonica A
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2010
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vol. 117
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issue 6
978
3
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Studies of New Antiferroelectric Liquid Crystal Based on Quantum-Chemical Model

86%
Tomczyk W., Marzec M., Juszyńska E., Dąbrowski R., Ziobro D., Wróbel S., Massalska-Arodź M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
949-953
EN
Physical properties of new thermotropic antiferroelectric liquid crystal have been studied. Experiments were done by use of complementary methods such as differential scanning calorimetry, polarizing optical microscopy and X-ray powder diffractometry. Acquired data from X-ray powder diffractometry was examined under application of quantum chemical approach. It has been found that compound studied exhibits stable enantiotropic antiferroelectric SmC_{A}* phase in the wide temperature range while ferroelectric phase SmC* is very narrow.
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