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Viscosity Behavior at the Nematic to Smectic A Phase Transition in Freely Flowing Compounds

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Jadżyn J., Czechowski G.
Acta Physica Polonica A
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2004
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vol. 105
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issue 5
459-465
EN
The paper shows that the shear viscosity at the nematic to smectic A phase transition in freely flowing n-hexyloxycy$ $anobiphenyl + n-octyloxycyanobiphenyl mixtures (a system exhibiting the reentrant nematic phase) corresponds to the Mięsowicz η_3 viscosity coefficient and its temperature behavior is analogous (but strongly enhanced) to that observed for the η_2 viscosity coefficient at the isotropic to nematic phase transition.
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The Current Phenomenon in the Indium-Tin Oxide-Alignment Layer-Liquid Crystal Structure

100%
Mykytyuk Z., Fechan A., Sushynsky O., Yasynovska O., Kotsun V.
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issue 1
248-250
EN
This work is connected to investigation of frequency dependences of conductive value and dielectric conductivity of the indium-tin oxide-alignment layer-liquid crystal structure which allows to find new ways in formation of the electrically stabilized structure of liquid crystal materials for the optoelectronic devices.
3
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Viscous Behavior of Binary Mixtures of Mesogenic Solvent/Non-Mesogenic Solute

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Jadżyn J., Czechowski G., Laskowski S.
Acta Physica Polonica A
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2006
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vol. 109
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issue 6
723-730
EN
The paper presents results of the shear viscosity measurements performed on diluted binary mixtures of mesogenic solvent n-hexylcyanobiphenyl (C_6H_{13}PhPhC≡N,6CB) and two non-mesogenic admixtures: (i) n-heptylcyanophenyl (C_7H_{15}PhC≡N,7CP), composed of the molecules of the same polarity as the solvent molecules but of a slightly shorter length, and (ii) 4-n-propylcyclohexyl-4'-n-pentylphenyl (C_3H_7CyHxPhC_5H_{11},3CyP5), composed of the non-polar molecules but of a length very close to that of the mesomorphic solvent molecules. The experiment showed that the concentrational depression of the clearing temperature and the temperature extent of the isotropic + nematic (I + N) two-phase region in the mixtures are significantly smaller, i.e. the nematic phase is more thermodynamically stable, when the admixture molecular length is compatible to that of the mesogenic solvent, regardless of the polarity of the admixture molecules. The activation energy for freely flowing mixtures in the isotropic, nematic, and two-phase I + N regions was determined and discussed.
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