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    Wyświetlanie 1-6 z 6
    Tytuł:
    The Structural Phase Transitions in 6CB-Based Ferronematics
    Autorzy:
    Tomašovičová, N.
    Koneracká, M.
    Kopčanský, P.
    Timko, M.
    Závišová, V.
    Tomčo, L.
    Jadżyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810567.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    61.30.Hn
    Opis:
    The structural transitions in ferronematics based on the thermotropic nematic liquid crystal 4-cyano-4'-hexylbiphenyl were studied. The ferronematic samples were prepared by doping with magnetic suspension consisting of $Fe_3O_4$ particles (10 nm in diameter) coated with oleic acid as a surfactant with different volume concentrations of magnetic particles (from $10^{-5}$ to $10^{-3}$). Freedericksz transitions were studied in combined electric and magnetic fields. The experimental results indicated soft anchoring with perpendicular initial orientation between the magnetic moment of the magnetic particles and director.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 336-338
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Field Induced Structural Transitions in 6CHBT-Based Ferronematics
    Autorzy:
    Tomašovičová, N.
    Timko, M.
    Koneracká, M.
    Závišová, V.
    Jadżyn, J.
    Beaugnon, E.
    Chaud, X.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428990.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    61.30.Hn
    Opis:
    Ferronematics are stable colloidal suspensions of magnetic particles in nematic liquid crystals. The presence of the magnetic particles enhances the magnetic susceptibility of ferronematics, in comparison with pure liquid crystals. In this work the thermotropic liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanato-benzene (6CHBT) and 6CHBT dissolved in phenyl isothiocyanate were doped with spherical magnetic nanoparticles with aim to increase the sensitivity of the liquid crystal on an external magnetic field. The volume concentration of the magnetic particles was 5 × $10^{-4}$. The phase transition temperature from isotropic to nematic phase in the external magnetic field up to 12 T was monitored by precise capacitance measurements in the capacitance cells filled with nematic sample as well as with the prepared ferronematic sample. There was no observable shift in the transition temperature in the case of pure 6CHBT, 6CHBT doped with spherical particles and 6CHBT dissolved in phenyl isothiocyanate while in the case of 6CHBT dissolved in phenyl isothiocyanate doped with spherical magnetic particles the shift in the temperature about 9C of the phase transition from isotropic to droplet state at the external magnetic field 12 T was observed.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1276-1278
    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:
    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:
    The Anchoring Energy of Liquid Crystal Molecules to Magnetic Particles in HAB-Based Ferronematics
    Autorzy:
    Tomašovičová, N.
    Koneracká, M.
    Kopčanský, P.
    Timko, M.
    Závišová, V.
    Vajda, A.
    Fodor-Csorba, K.
    Éber, N.
    Tóth-Katona, T.
    Jadzyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813941.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    61.30.Hn
    Opis:
    In this work we describe the magnetic Freedericksz transition in HAB-based (4, 4'-di-n-heptylazoxybenzene) ferronematics. The ferronematic samples were prepared with two different volume concentrations of magnetic particles $φ_1 = 2×10^{-5}$ and $φ_2 = 2×10^{-4}$. The liquid crystal HAB is nematic at the temperatures from ≈53°C to 70°C and smectic A at the temperatures under 53°C. The anisotropy of dielectric permitivity of HAB liquid crystal is positive in nematic phase and negative in smectic A phase. The magnetic Fredericksz transition was studied in nematic phase at temperature 60°C.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 591-594
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Phase Transition in Liquid Crystal Doped with Gold Nanoparticles
    Autorzy:
    Kopčanský, P.
    Tomašovičová, N.
    Koneracká, M.
    Timko, M.
    Mitróová, Z.
    Závišová, V.
    Éber, N.
    Fodor-Csorba, K.
    Tóth-Katona, T.
    Vajda, A.
    Jadzyn, J.
    Beaugnon, E.
    Chaud, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535052.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    61.30.Gd
    61.30.Hn
    Opis:
    The influence of the inclusion of the dodecanethiol functionalized gold particles (with diameter 3-5 nm) on the structural transitions was investigated. The studied samples were based on the nematic liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT). The volume concentration of the gold particles was $ϕ_1 = 2 × 10^{-4}$ and $ϕ_2 = 10^{-3}$. The obtained results showed that the inclusion of the gold particles in the 6CHBT liquid crystal increases the sensitivity of such system on the external magnetic field.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 988-989
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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