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    Wyświetlanie 1-6 z 6
    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
    Tytuł:
    Dielectric Properties of Lyotropic Magnetic Liquid Crystal
    Autorzy:
    Kopčanský, P.
    Tomčo, L.
    Jadzyn, J.
    Swiergiel, J.
    Majorošová, J.
    Kubovčíková, M.
    Timko, M.
    Rajňák, M.
    Šipošová, K.
    Gažová, Z.
    Bednariková, Z.
    Hu, Chin-Kun
    Hayryan, S.
    Studenyak, I.
    Kovalchuk, T.
    Kovalchuk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387983.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    61.30.St
    75.50.Mm
    Opis:
    An important feature of lyotropic liquid crystals is the self-assembly of the amphiphilic molecules as supermolecular structures. We have studied the formation of nematic liquid crystal phase in solutions containing lysozyme amyloid fibrils and magnetic nanoparticles using oscilloscopic method. Interaction of fibrils with magnetic nanoparticles under the external magnetic field resulted in fibril re-arrangement. The analysis of the obtained results suggests that the decrease in conductivity of solutions in presence of magnetic field is due to decrease of the ion mobility caused by re-arrangement of structures in the solution. The obtained results allow determination of the optimum ratio of the components which can lead to preparation of solutions with a more ordered structure in presence of magnetic field.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 632-634
    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:
    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
      Wyświetlanie 1-6 z 6

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