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Pozycja Tydzień z matematyką i fizyką(Wydawnictwo Politechniki Łódzkiej, 2021) Niedziałkowska, AgnieszkaWykładowcy Centrum Nauczania Matematyki i Fizyki PŁ od 6 do 10 września przeprowadzili zajęcia dla uczniów pięciu liceów ogólnokształcących z terenu województwa łódzkiego, objętych przez Centrum patronatem. Tydzień z matematyką i fizyką odbył się po raz jedenasty!Pozycja MathUp, czyli matematyka przyjacielem studentów(Wydawnictwo Politechniki Łódzkiej, 2021) Gwóźdź-Łukawska, Gertruda; Kondratiuk-Janyska, Alina; Potyrała, MonikaPo raz trzeci na Wydziale Elektrotechniki, Elektroniki, Informatyki i Automatyki odbyła się Konferencja Zastosowań Matematyki MathUp. – Nie spodziewałam się, że udział w konferencji tak bardzo mi się spodoba – komentuje jedna z uczestniczek.Pozycja Fizycy o tym co wisi w powietrzu(Wydawnictwo Politechniki Łódzkiej, 2021) Słoma, Piotr24. Piknik Naukowy organizowany przez Polskie Radio i Centrum Nauki Kopernik po raz kolejny odbył się wirtualnie. W tym roku pod hasłem Klimat i my. Tradycyjnie wzięli w nim udział fizycy z Centrum Nauczania Matematyki i Fizyki PŁ.Pozycja Electrical and thermal properties of anthrone(Wydawnictwo Politechniki Łódzkiej, 2020) Kania, Sylwester; Kuliński, Janusz; Sikorski, DominikQuantum-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, KrzysztofStrong 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 MathUp on-line(Wydawnictwo Politechniki Łódzkiej, 2020) Potyrała, Monika; Gwóźdź-Łukawska, GertrudaKonferencja o zastosowaniach matematyki on-line? Bez referatów na żywo? Bez interakcji? Bez przerwy kawowej i ciasteczek? Tak. Jak najbardziej! W niespełna miesiąc po zawieszeniu zajęć odbyła się Druga Konferencja Zastosowań Matematyki MathUp. Studenci wyższych lat przygotowali referaty dzieląc się swoimi pasjami. Nagrodą główną był Puchar Dziekana WEEIA.Pozycja Powtórka mat-fiz przed maturą(Wydawnictwo Politechniki Łódzkiej, 2020) Just, AndrzejDzieci pracowników Politechniki Łódzkiej otrzymały pomoc ze strony Centrum Nauczania Matematyki i Fizyki w przygotowaniu się do matury. Z uwagi na aktualną sytuację, wsparcie dla tegorocznych maturzystów możliwe było jedynie online.Pozycja Piknik Naukowy Online(Wydawnictwo Politechniki Łódzkiej, 2020) Wojciechowski, Krzysztof24. Piknik Naukowy miał się odbyć na Stadionie Narodowym w Warszawie. Tak jak wszystkie imprezy masowe musiał przenieść się do wirtualnej rzeczywistości.Pozycja Andrzej Dems (1938-1988)(Wydawnictwo Politechniki Łódzkiej, 2020) Dems-Rudnicka, Katarzyna; Stawski, DawidW trzydziestą rocznicę śmierci Andrzeja Demsa wspominali Go uczestnicy konferencji Central European Conference Fibre Grade Polymers, Chemical Fibres and Special Textiles związanej z tematyką badawczą, nad którą pracował.Pozycja Charge carrier mobility in non-equilibrated transport in molecular materials(Lodz University of Technology Press, 2019) Kania, Sylwester; Kościelniak-Mucha, Barbara; Kuliński, Janusz; Słoma, Piotr; Wojciechowski, KrzysztofNon-equilibrated transport of charge carriers in the molecular material depends on the structure and packing of the molecules. Explanation of the measurements of the photocurrent generated with use of UV flash light in organic layer needs to define the quantity of charge carriers mobility. Definition of this quantity in the scope of some defined transport model requires the detailed analysis of generation, recombination and charge transfer between neighbouring molecules. The problem is discuss on the basis of transport properties of two anthracene derivativesPozycja Polarization of organic aromatic molecule in anionic and cationic state(Lodz University of Technology Press, 2019) Kania, Sylwester; Kościelniak-Mucha, Barbara; Kuliński, Janusz; Słoma, Piotr; Wojciechowski, KrzysztofThe modification of electron states and the change in the geometry of the structure of molecule during hopping transport of charge carriers depends on the symmetry of the molecule. During electric transport the molecule reversibly transforms from neutral state to cation when hole conductivity occurs or to anion when electron conductivity occurs. The energies of orbitals HOMO and HOMO1 of anthrone and anthrachinone are always negative, what allows for holes transport. Positive energies of LUMO and LUMO+1 orbitals of anion of anthrone and anthraquinone in structure of anion or neutral molecule make electron transport difficult.Pozycja Electrical and thermal properties of anthraquinone layers(Lodz University of Technology Press, 2019) Kania, Sylwester; Kuliński, Janusz; Sikorski, DominikQuantum-chemical calculations indicate that the bond lengths in the anthraquinone anthracene backbone are shorter than the corresponding bonds in unsubstituted anthracene. The shape of the frontier molecular orbitals (FMO) indicates the possibility of more efficient electron capture by the anthraquinone molecule than by the anthracene molecule while maintaining stability in the conditions prevailing in electrochemical cells. Differential scanning calorimetry (DSC) studies indicate the temperature stability of anthraquinone above the melting point up to 300C. The glass transition is determined at about 100°C.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, DominikHole 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, KrzysztofAb 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 Sensitivity of tetracene layer as an effect of entanglement(Wydawnictwo Politechniki Łódzkiej, 2017) Kania, Sylwester; Kościelniak-Mucha, Barbara; Kuliński, Janusz; Słoma, Piotr; Wojciechowski, KrzysztofApplication of the method of quantum-mechanical calculations allowed for studies of variability of interactions between molecules of ethanol and tetracene. Entanglement of quantum states is seen during calculations in two ways: as a change of electric dipole moment and as an increase of the basis set superposition error (BSSE) with decreasing distance between molecules under study. There are observed the dependences of the total energy of the system due to the mutual arrangement of the long axes of the molecules and due to the orientation of the bond of the oxygen atom to the carbon atom with respect to the plane of benzene skeleton of tetracene molecule.Pozycja The effect of the dipole moment on hole conductivity of polycrystalline films of two anthracene derivatives(Wydawnictwo Politechniki Łódzkiej, 2017) Kania, Sylwester; Kościelniak-Mucha, Barbara; Kuliński, Janusz; Słoma, Piotr; Wojciechowski, KrzysztofHole mobility in the polycrystalline layers of anthrone and anthraquinone differs in one order of magnitude in spite of nearly the same crystalline structure. The origin of this difference was determined with use of the quantum-mechanical calculations carried out at the density functional theory level using the B3lYP functional in conjunction with the 6-311++G(d,p) basis set. Based on theses calculations, we suppose that these difference can result from the presence of the dipol moment in the anthrone molecules.Pozycja Comparative study of the influence of the reorganization energy on the hole transport of two four-cyclic arenes(Wydawnictwo Politechniki Łódzkiej, 2017) Kania, Sylwester; Kuliński, Janusz; Sikorski, DominikApplication of the method of quantum-mechanical calculations allowed the determination of the reorganization energy of the molecules of tetracene and p-quaterphenyl and the estimation of the transfer rate integral between neighbouring molecules present in the solid state. Comparison of the transfer rates for holes with the values of the mobility, obtained experimentally for the polycrystalline tetracene layers and p-quaterphenyl layers vaporized in the vacuum in the similar conditions indicate that the molecule’s structure possess the dominate impact on the conductivity of the thin layers of these compounds.Pozycja Elimination of the impact of rc constant on transient photocurrents measured in organic layers.(Wydawnictwo Politechniki Łódzkiej, 2016) Kania, Sylwester; Kuliński, JanuszWe present a calculation method for elimination of the effect of the RC constant of the measuring circuit in the time-of-flight (TOF) measurements where a pulse generation of the photocurrent in a thin layer of low-molecular organic material is exploited. Presented method allows to eliminate the influence of the component of displacement current related to dielectric losses and obtaining the actual conduction current time dependence. The method was tested on the thin layers of 1,5-dihydroxynaphthalene.Pozycja The effect of symmetry of a molecule electronic density on the dipole moment of unit cell and hole conductivity of thin polycrystalline films of anthrone and anthraquinone.(Wydawnictwo Politechniki Łódzkiej, 2016) Kania, Sylwester; Kościelniak-Mucha, Barbara; Kuliński, Janusz; Słoma, Piotr; Wojciechowski, KrzysztofThe electronic structure of anthrone and anthraquinone molecules in the gas state and in the simulated crystal unit cell were calculated with time dependent-density functional theory (TD-DFT) method. The values of dipole moment of single molecule and of single crystal unit cell were also determined with TD-DFT method. The results of TD-DFT were compared with known crystal structures of both compounds [1,2]. For both molecules it was observed improvement of matching the length of corresponding bonds when calculated for the unit cell. Unexpectedly high value of dipole moment was calculated for the single unit cell of anthrone. This fact can be responsible for the nano-dimension properties of anthrone as the carriers mobility or high boiling point.Pozycja Dielectric properties of ferroelectric liquid crystalline material with chiral nematic phase.(Wydawnictwo Politechniki Łódzkiej, 2015) Wojciechowski, Marek; Bąk, Grzegorz W.; Tykarska, MarzenaThe ferroelectric liquid crystal with nematic N* phase has been investigated using broadband low frequency dielectric spectroscopy. The dielectric relaxation modes related to a ferroelectric Goldstone mode were detected only in a narrow temperature range. Well defined relaxation process was detected in the SmB* phase at about 90 Hz.