2018, vol. 39

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  • Pozycja
    Scientific Bulletin. Physics No. 1224, vol. 39 (2018)
    (Lodz University of Technology Press, 2018) Lodz University of Technology; Politechnika Łódzka
  • Pozycja
    Frequency dependence of the Kerr constant in nynas nytro 3000 oil determined by the polarimetric method
    (Wydawnictwo Politechniki Łódzkiej, 2018) Poborska, Julita; Dąbrówka, Dominika; Chwirot, Maksymilian; Ledzion, Rafał; Izdebski, Marek; Kucharczyk, Włodzimierz
    Frequency dependence of the Kerr constant in nynas nytro 3000 oil determined by the polarimetric method A frequency dependence of the Kerr constant K in transformer oil Nynas Nytro 3000 within a frequency range 117-5017 Hz is determined. An averaged value (2.30 ± 0.03)·10ˉ¹⁵ m/V² for K is obtained. The constant is found to be weakly frequency dependent and approaches its maximum 2.37·10ˉ¹⁵ m/V² at about 3000 Hz. The Kerr constant is of comparable value to that observed in other mineral oils employed previously in measurements of the quadratic electro-optic effect and the electrostriction in crystals.
  • Pozycja
    The origin of the interaction responsible for the difference of hole mobility of thwo derivatives of anthracene
    (Wydawnictwo Politechniki Łódzkiej, 2018) Kania, Sylwester; Kuliński, Janusz; Sikorski, Dominik
    Hole mobility of the layers built from two anthracene derivatives differing in the substitution of the central benzene ring, i.e. anthrone substituted with only one keto group and anthraquinone substituted with two keto groups differs by one order of magnitude despite the fact that both have almost identical crystal structure. We ascribe this difference to existence of an additional intermolecular interaction arising in the layer of anthrone.
  • Pozycja
    Ab initio investigation of ethanol-tetracene interactions during adsorption
    (Wydawnictwo Politechniki Łódzkiej, 2018) Kania, Sylwester; Kościelniak-Mucha, Barbara; Słoma, Piotr; Wojciechowski, Krzysztof
    Ab initio calculations presented in this work are performed to investigate the geometry, interaction energy and bonding properties of binary complexes formed between neutral ethanol and tetracene molecules. Two different geometries were applied for the study. The interaction energies between molecules in the complex posses minimum at the distance of about 3.6 A among oxygen atom in ethanol and the neighbouring carbon atom of tetracene skeleton.
  • Pozycja
    Flexoelectric torque in uniformly lying helix structures of chiral nematic liquid crystal
    (Wydawnictwo Politechniki Łódzkiej, 2018) Buczkowska, Mariola
    Electric field induced deformations of chiral nematic liquid crystal layers were studied numerically. Uniformly lying helix structure of short pitch flexoelectric mixtures was considered. The electro-optic effect due to rotation of optical axis around the normal to the layer was simulated. The flexoelectric torque arising under the action of bias voltage and responsible for this rotation was calculated. It was found that the prevailing torque occurs in close vicinity of the boundary plates. Nonlinearity of superposition of splay and bend contributions to the total flexoelectric torque was found.