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Wyszukujesz frazę "Gdovinová, V." wg kryterium: Autor

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    Tytuł:
    The Influence of Magnetic Particles on the Nematic Droplets Formation in Liquid Crystal
    Autorzy:
    Majorošová, J.
    Gdovinová, V.
    Tomašovičová, N.
    Juríková, A.
    Závišová, V.
    Jadzyn, J.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032205.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    67.30.Hm
    Opis:
    In this work the thermotropic nematic liquid crystal 4-trans-4'-n-hexyl-cyclohexyl-isothiocyanato-benzene (6CHBT) was dissolved in phenyl-isothiocyanate and doped with spherical magnetic particles with volume concentration ϕ₁=10¯⁴ and ϕ₂=10¯³. The influence of the volume concentration on the phase transitions from isotropic to nematic phase was studied by three experimental methods: optical microscopy, differential scanning calorimetry, and dielectric measurements. The obtained results confirmed the coexistence of isotropic and nematic phase, i.e. nematic or ferronematic droplets in isotropic phase in a wide temperature range between nematic and isotropic phase.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 955-957
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Magnetic Field Response in Ferronematics
    Autorzy:
    Gdovinová, V.
    Tomašovičová, N.
    Závišová, V.
    Éber, N.
    Tóth-Katona, T.
    Royer, F.
    Jamon, D.
    Jadzyn, J.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031035.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    61.30.Hn
    Opis:
    In this work the 4-n-hexyl-4'-cyanobiphenyl liquid crystal was doped with differently shaped magnetite nanoparticles. The structural changes were observed by capacitance measurements. Influence of the shape of magnetic particles on magnetic Fréedericksz transition depends on the type of anchoring, which is characterized by the density of the anchoring energy and by the initial orientation between the liquid crystal molecules and the magnetic moment of the magnetic particles. It was observed that in the case of doping with spherical particles, the critical magnetic field is shifted to higher values with increase of volume concentration of the magnetic nanoparticles but decreases with increase of biasing voltage. In the case of doping with rod-like particles, the critical magnetic field is almost independent of the volume concentration of the magnetic nanoparticles.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 934-936
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interaction of Magnetic Nanoparticles with Lyotropic Liquid Crystal Studied by AFM
    Autorzy:
    Tomašovičová, N.
    Yang, C.
    Balejčíková, L.
    Gdovinová, V.
    Kubovčíková, M.
    Hayryan, S.
    Hwang, I.
    Hu, Chin-Kun
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032211.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.Fk
    87.14.em
    82.37.Gk
    Opis:
    In this work the interaction of lysozyme fibrils with magnetic particles has been studied by atomic force microscopy. The experiments were carried out for a better understanding of the binding process of such complex soft matter systems. The obtained results show that interaction between lysozyme fibrils and magnetic particles starts immediately after mixing them together. Moreover, the samples remain stable in duration of several days after preparation.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 958-960
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How to Enhance Sensitivity of Liquid Crystals to External Magnetic Field?
    Autorzy:
    Kopčanský, P.
    Tomašovičová, N.
    Gdovinová, V.
    Timko, M.
    Éber, N.
    Tóth-Katona, T.
    Jadzyn, J.
    Honkonen, J.
    Chaud, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383988.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    61.30.Hn
    Opis:
    Liquid crystals, due to their large dielectric anisotropy, respond very sensitively to application of an external electric field, whereas they are only weakly sensitive to the magnetic field. A possible way of improving that sensitivity is doping liquid crystals with magnetic nanoparticles. As a result, stable colloidal suspensions of liquid crystals with relatively low concentrations of magnetic nanoparticles (called ferronematics, ferrocholesterics, ferrosmectics, etc.) can be produced. We illustrate some examples of the influence of the magnetic field, as well as of a superposition of magnetic and electric fields on the structural transitions (e.g. on the Fréedericksz transition) in ferronematics based on the calamitic liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT). It is shown that the samples respond to the applied magnetic field of low strength. The effects of the magnetic particles and magnetic field on the nematic to isotropic phase transition temperature are discussed as well.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 157-162
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of Nematic to Isotropic Phase Transition in Liquid Crystal Doped with Magnetic Nanoparticles
    Autorzy:
    Csach, K.
    Juríková, A.
    Miškuf, J.
    Tomašovičová, N.
    Gdovinová, V.
    Závišová, V.
    Kopčanský, P.
    Éber, N.
    Fodor-Csorba, K.
    Vajda, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032719.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.-v
    64.70.mj
    65.80.-g
    Opis:
    A binary mixture of bent-core and rod-shaped liquid crystals was chosen as a model substance combining the properties of both types of liquid crystals. The mixture was doped with a small amount of spherical and rod-like magnetic nanoparticles. Differential scanning calorimetry experiments were performed for the pure as well as for the doped mixture at different heating rates ranging from 1 to 16°C/min. The addition of the magnetic nanoparticles lowered the phase transition temperature. This effect is more intensive in the case of the rod-like magnetic nanoparticles. The kinetics of the nematic to isotropic phase transition was evaluated in the framework of the differential isoconversional method. The calculated apparent activation energy showed non-monotonic behaviour and a sensitivity on the shape of added magnetic nanoparticles.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 949-951
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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