Scientific Bulletin. Physics.

Stały URI zbioruhttp://hdl.handle.net/11652/2752

W czasopiśmie Scientific Bulletin. Physics publikowane są artykuły pracowników i studentów Instytutu Fizyki PŁ, pracowników Centrum Nauczania Matematyki i Fizyki PŁ oraz pracowników innych uczelni, dotyczące najnowszych badań we wszystkich dziedzinach fizyki. Ukazuje się jeden zeszyt rocznie. Czasopismo wydawane jest w języku angielskim. Wszystkie prace są recenzowane. Czasopismo jest indeksowane w bazie BazTech.



The Scientific Bulletin. Physics journal publishes articles of employees and students of the Institute of Physics, Technical University of Lodz, employees of the Center for Teaching Mathematics and Physics, and employees of other universities, regarding the latest research in all areas of physics. One issue is published every year. The journal is published in English. All works are reviewed. The journal is indexed in the BazTech database.



Strona wydawcy : https://wydawnictwo.p.lodz.pl

Strona czasopisma : https://eczasopisma.p.lodz.pl/PHYSICS

DOI : 10.34658/physics



Przeglądaj

Filtry

2020 - 20216

Ustawienia

Data rozpoczęcia: 2020Data zakończenia: 2021

Wyniki wyszukiwania

Teraz wyświetlane 1 - 6 z 6
  • Pozycja
    Volume conductivity of polycrystalline tetracene and p-quaterphenyl layers modified under influence of the surface adsorption
    (Wydawnictwo Politechniki Łódzkiej, 2021) Kania, Sylwester; Kuliński, Janusz; Kościelniak-Mucha, Barbara; Słoma, Piotr; Wojciechowski, Krzysztof
    Volume conductivity of thin organic layers in contact with the ambient atmosphere depends on the volume properties and on the adsorption processes on the free surface of the layer. In order to clarify the role of the surface, experiments were carried out at a temperature close to 293 K to determine the influence of the adsorption dynamics on the change of characteristic relationships observed for the transport of electric charge in vacuum, in the ambient atmosphere and in the controlled atmosphere of the ethyl alcohol vapors. The investigations were carried out for two linear tetracyclic molecular structures, i.e. p-tetraphenyl and tetracene. These molecular systems differ in organization of the rings. The results show an increase in conductivity measured for both compounds when there are the molecules capable of adsorbing to the surface and to transfer or receive charge carriers connected with the process of diffusion or drift transport in the volume of the layer. The nature of the observed increase in conductivity proves that the hopping mechanism is present in the case of conductivity of both tested materials.
  • Pozycja
    Intermolecular interactions for two chosen anthracene derivatives
    (Wydawnictwo Politechniki Łódzkiej, 2021) Kania, Sylwester; Kuliński, Janusz; Kościelniak-Mucha, Barbara; Słoma, Piotr; Wojciechowski, Krzysztof
    The nature of intermolecular interactions for anthrone and anthraquinone differs due to the symmetry of substitution of the central benzene ring, i.e. anthrone substituted with only one keto group and anthraquinone substituted with two keto groups. In order to interpret the interactions among the molecules, the interaction energies between molecules in crystals were calculated using DFT B3LYP calculations. The results reveal the consistency between calculated “lattice energies” and theirs terms and thermodynamical properties as density, boiling point and melting point of examined compounds.
  • Pozycja
    Electrical and thermal properties of anthrone
    (Wydawnictwo Politechniki Łódzkiej, 2020) Kania, Sylwester; Kuliński, Janusz; Sikorski, Dominik
    Quantum-chemical density functional theorem (DFT) calculations indicate that the value of the reorganization energy indicates the possibility of efficient hole capture by the anthrone molecule during transport process of charge carriers. Differential scanning calorimetry (DSC) studies indicate the temperature stability of anthrone molecules above the melting point up to 164°C. The glass transition is determined at 153.7 °C and melting point at 157.05 °C.
  • Pozycja
    A DFT study of reorganization energy of some chosen carbazole derivatives
    (Wydawnictwo Politechniki Łódzkiej, 2020) Kania, Sylwester; Kościelniak-Mucha, Barbara; Kuliński, Janusz; Słoma, Piotr; Wojciechowski, Krzysztof
    Strong efforts toward finding an organic semiconductor with a molecule characterized by a low charge transfer energy applying quantum-chemical calculations are undertaken. Density Functional Theory (DFT) calculations made for carbazole (Cz) and three isomers of benzocarbazole, benzo (a) carbazole (BaCz), benzo (b) carbazole (BbCz) and benzo (c) carbazole (BcCz) proves the possibility of lacking the growth of reorganization energy despite the molecule dimentions enlargement. Benzo(b)carbazole molecules with high longitudinal dimension of the rigid skeleton d = 9,05 Å posses the low value of reorganization energy for both hole and electron transport of 0,18 eV and 0,11 eV, respectively. We suggest that the reduction of reorganization energy may be related to the diminishing of intramolecular hydrogen interactions.
  • Pozycja
    Comparison of some properties and molecular structure of MHPOBC and chlorinated MHPOBC
    (Wydawnictwo Politechniki Łódzkiej, 2020) Bąk, Grzegorz W.
    Comparison of molecular structure of MHPOBC and chlorinated MHPOBC has been made and presented in the paper. The main difference in molecular structure of MHPOBC and chlorinated MHPOBC molecules consists in different properties of two chemical bonds between the benzene ring with substituted chlorine atom and neighbouring parts of molecule. For chlorinated version of MHPOBC the component of molecular dipole moment perpendicular to the long axis of molecule is substantially smaller than for MHPOBC molecules. As a result of chlorination core of MHPOBC molecules becomes more flexible. These differences of molecular structure lead to easily noticeable differences in macroscopic properties of MHPOBC and its chlorinated version.
  • Pozycja
    Flexoelectro-optic effect with large rotation angle of optic axis
    (Wydawnictwo Politechniki Łódzkiej, 2020) Buczkowska, Mariola
    The flexoelectro-optic effect in layers of chiral nematics was investigated numerically. The simulations concerned short pitch materials with the helix axis parallel to the layer plane. Configurations which allow to avoid accumulation of ions at the electrodes and are suitable for square-wave driving voltage were considered. They were related to large rotation angles of the optical axis of the layer about the normal to the layer. Influence of chosen parameters on efficiency of the electro-optic effect was studied.