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Wyszukujesz frazę "Tomčo, L." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    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:
    Dielectric Properties of Magnetic Liquids in High Electric Fields
    Autorzy:
    Herchl, F.
    Kopčanský, P.
    Timko, M.
    Koneracká, M.
    Marton, K.
    Kolcunová, I.
    Tomčo, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813918.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    77.22.-d
    Opis:
    In this work, dielectric properties of magnetic fluids composed of magnetite particles dispersed in transformer oil and subjected to a uniform magnetic field were investigated at the high alternating electric field intensities in the range of 0.5-2.5 MV/m. Dielectric stability of the magnetic fluid with the particle volume concentrationΦ= 0.0019 was observed. The magnetic fluid with the concentrationΦ= 0.019 showed the significant changes of permittivity and dielectric losses, too.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 569-572
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Dynamics of the Soret Effect in Thin Film of Magnetic Fluid
    Autorzy:
    Kopčanský, P.
    Tomčo, L.
    Timko, M.
    Ocelík, V.
    Koneracká, M.
    Turek, I.
    Štelina, J.
    Musil, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013709.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    66.10.Cb
    75.50.Mm
    Opis:
    The Soret effect in interference field of two intensive laser beams in the thin film of magnetic fluid was used to create a periodical structure of density of magnetic particles. The structures obtained were indicated using the self-diffraction of the optical beam creating the structures. The relaxation phenomena after switching off the laser interference field were discussed in terms of the spectrum of relaxation times. This spectrum is proportional to hydrodynamic particle size distribution. The relaxation of optical grating consists of two well-defined channels, i.e. decay through single particles and small aggregates, respectively.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 875-878
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Investigation on the E-J Characteristics and the Role of Nanoparticle Concentration in Weakly Polar Magnetic Fluids
    Autorzy:
    Kurimský, J.
    Dolník, B.
    Marton, K.
    Kolcun, M.
    Tomčo, L.
    Rajňák, M.
    Timko, M.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201885.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    77.22.Jp
    84.37.+q
    Opis:
    The paper presents investigation on the magnetic fluids that are stable colloidal suspensions of single-domain magnetic particles in a liquid carrier of dielectrics nature. Studies were made on the electric field vs. current density, e.i. E-J characterization commonly observed in insulating liquids under uniform low electric or magnetic fields. High performance oil was used as the dielectric carrier. The experiments were carried out at different volume concentrations of magnetite nanoparticles up to 4%.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 246-247
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Magnetic Field on Dielectric Breakdown in Transformer Oil Based Ferrofluids
    Autorzy:
    Rajňák, M.
    Dolník, B.
    Marton, K.
    Tomčo, L.
    Molčan, M.
    Kopčanský, P.
    Timko, M.
    Kurimský, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201920.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Mm
    77.22.Jp
    75.75.Jn
    Opis:
    In this paper the experimental study of the breakdown field strength in a transformer oil based ferrofluid is reported. The experiments are conducted on five ferrofluid samples with different magnetic volume fraction. The influence of external magnetic field on the breakdown field strength is investigated, when a quasi-homogenous magnetic field was applied in parallel and perpendicular configuration in regard to the electric field. The obtained results are analysed in accordance to the electron charging of ferrofluid nanoparticles theory.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 248-249
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic-Field Induced Isotropic-Nematic Phase Transition in PDLC Doped with Magnetic Nanoparticles
    Autorzy:
    Mitróová, Z.
    Tomašovičová, N.
    Timko, M.
    Koneracká, M.
    Tomčo, L.
    Jadżyn, J.
    Palewski,, T.
    Kopčanský, P.
    Kovalchuk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429068.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    75.30.Hx
    75.75.Fk
    77.84.Nh
    Opis:
    The paper presents a study of the polymer dispersed liquid crystals that consist of liquid crystal 4-trans-4'-n-hexyl-cyclohexyl-isothiocyanatobenzene (6CHBT) microdroplets dispersed in polyvinyl alcohol and doped with various kinds of magnetic particles. As magnetic nanoparticles there were used single walled carbon nanotubes and magnetite labeled single walled carbon nanotubes. The volume concentration of the particles was 2 × $10^{-3}$. Magnetic properties were investigated by a SQUID magnetometer. The higher saturation magnetization has been achieved in sample polymer dispersed liquid crystal doped with magnetite labeled single walled carbon nanotubes. The phase transition temperature from isotropic to nematic phase at the external magnetic field 0 T and 12 T was monitored by precise capacitance measurements in the capacitance cell filled with prepared sample. The significant shift of the phase transition temperature (0.2°C) at the external magnetic field 12 T has been observed in sample polymer dispersed liquid crystal doped with magnetite labeled single walled carbon nanotubes.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1299-1301
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hall Effect in ZnO Extrinsic Structure
    Autorzy:
    Dolník, B.
    Kurimský, J.
    Marton, K.
    Kolcun, M.
    Tomčo, L.
    Briančin, J.
    Fabián, M.
    Halama, M.
    Vojtko, M.
    Rajňák, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1200027.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    72.20.My
    84.32.Ff
    84.37.+q
    81.05.Xj
    72.80.Ng
    Opis:
    Zinc oxide-based extrinsic composite was investigated. The sample was selected from a series of components of one production batch, prepared by standard sintering technology. The content of extrinsic elements in ZnO base was determined by SEM. Van der Pauw method with four-point electrode fixture was used for study of conducting phenomena in square-shaped sample. It is normaly preferred to assume the symmetric uniformity of the electrical properties of sample, for which sheet resistance, bulk resistivity and Hall mobility, sheet carrier density and carrier concentration can be calculated. When the uniformity of measured parameters is breached, the anisotropy in the arrangement of the internal structure may be the cause. There remains the question of whether the extrinsic ZnO material can be isotropic, regarding the electrical conductivity. Although the Hall effect has been measured, preliminary measurements indicate the presence of anisotropy in the measured samples. Before measurement the following phenomena should be taken into account: magneto-electric effect, photo-electric effect and the isothermal condition should be preserved. Paper discusses the uniformity deviations for the defined setup configurations for positive and negative magnetic field directions. Bulk resistivity has been calculated by numerical solution of van der Pauw equation. Large offset voltage during the measurement is discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 76-77
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids
    Autorzy:
    Timko, M.
    Kopcansky, P.
    Molcan, M.
    Tomco, L.
    Marton, K.
    Molokac, S.
    Rybar, P.
    Stoian, F.
    Holotescu, S.
    Taculescu, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428655.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    77.22.Gm
    77.22.Ch
    Opis:
    This contribution is devoted to study of dielectric and magnetodielectric properties in transformer oil based magnetic fluid. The dielectric permittivity and their anisotropy at various mutual orientation electric (50 Hz) and magnetic field were shown at the different volume concentrations of nanoparticles at room temperature. The linear increase of dielectric constant with volume concentration was confirmed which is in good agreement with the theoretical Maxwell prediction. The dielectric anisotropy factor g(B, ω) is very close to g=1. The values of permittivity increased with the increase of volume fraction of magnetite nanoparticles. The highest value of anisotropy characterized by deviation of permittivity $Δε=ε_{∥} - ε_{⊥}$ was found for the highest volume concentration which could mean that no aggregation of magnetite nanoparticles had appeared.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1253-1256
    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
      Wyświetlanie 1-9 z 9

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