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Wyszukujesz frazę "Bauman, D." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Optical Order Parameter of Dichroic Azo-Dyes in Liquid Crystalline Side-Chain Polysiloxanes
    Autorzy:
    Chrzumnicka, E.
    Bauman, D.
    Jadżyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035645.pdf
    Data publikacji:
    2002-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.41.+e
    61.30.Gd
    64.70.Md
    Opis:
    Polarized light absorption spectra of seven dichroic azo-dyes dissolved in mesogenic side-chain polysiloxanes were recorded as a function of temperature. On the basis of the spectra the optical order parameter of the dyes was determined. The influence of the dye on the phase transition temperatures of polysiloxanes was examined. The results obtained for polysiloxanes were compared with the data for low molecular weight liquid crystal.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 6; 767-780
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Guest Effect on Nematic-Isotropic Phase Transition Temperature of Liquid Crystal 6CHBT
    Autorzy:
    Bauman, D.
    Solczyński, J.
    Chrzumnicka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968468.pdf
    Data publikacji:
    1997-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    64.70.Md
    Opis:
    The polarized absorption spectra of seven dichroic azo dyes dissolved in the nematogenic liquid crystal host 6CHBT have been recorded as a function of temperature. On the basis of these spectra, the guest order parameter has been determined. Moreover, the influence of the dye addition on the behaviour of the guest-host mixture in the vicinity of the nematic- isotropic phase transition has been examined. The experimental results have been compared in some details with the calculations done on the basis of the mean field theory for binary mixtures.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 6; 1151-1161
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Orientational Behaviour of the Guest-Host Systems in the Smectic A and Nematic Phases
    Autorzy:
    Bauman, D.
    Moryson, H.
    Wolarz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920664.pdf
    Data publikacji:
    1992-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    64.70.Ew
    Opis:
    The measurements of the polarized absorption and fluorescence components spectra for the guest-host mixtures have been used to study the long orientational order in the uniaxial phases of the liquid crystal. The temperature dependence of the order parameters, ⟨P$\text{}_{2}$⟩ and ⟨P$\text{}_{4}$⟩, has been investigated and the molecular distribution function has been determined. On the basis of the ⟨P$\text{}_{2}$⟩ and ⟨P$\text{}_{4}$⟩, values some conclusions about the molecular orientation in the smectic A and nematic phases of the liquid crystalline samples have been drawn. It has been also found that the fluorescence spectroscopy is a sensitive method for determination of the phase transition temperatures of the liquid crystal doped with the fluorescent dye.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 4-5; 559-570
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Guest-Host Interactions in Nematic p-Cyano-p-Alkylphenylcyclohexanes
    Autorzy:
    Bauman, D.
    Moryson, H.
    Jadżyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930624.pdf
    Data publikacji:
    1994-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    64.70.Md
    Opis:
    Studies of the temperature dependence of the guest order parameter for binary mixtures of the dichroic azo dye in the homologous series of the p-cyano-p'-alkylphenylcyclohexane were performed. Odd-even effect for the order parameter value was observed. A correlation between the shift in the nematic-isotropic transition temperature after dye addition and the orientation of the guest molecules in the nematic host was discussed.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 3; 553-562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces
    Autorzy:
    Bauman, D.
    Płóciennik, A.
    Inglot, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807783.pdf
    Data publikacji:
    2009-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.18.-g
    68.47.Pe
    61.30.Gd
    33.20.-t
    Opis:
    A study of azo dye/liquid crystal mixtures in monolayers formed at an air-water interface (the Langmuir films) and at a solid surface (the Langmuir-Blodgett films) has been performed. Five azo dyes with various molecular structure and the liquid crystal 4-octyl-4'-cyanobiphenyl (8CB) have been used. The dyes have been added to the liquid crystal at various molar fractions. Surface pressure and surface potential versus mean molecular area isotherms for the Langmuir films have been recorded and information about intermolecular interactions at the air-water interface has been obtained. On the basis of electronic absorption measurements for the Langmuir and Langmuir-Blodgett films the conclusions about the ability of dyes molecules to form self-aggregates at the interfaces have been drawn. The influence of the dye molecular structure and its concentration on aggregates' geometry has been found.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 2; 203-210
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Guest Influence on the Dipolar Association of the Nematic Liquid Crystal Host
    Autorzy:
    Bauman, D.
    Fan, Zhong-Xiao
    Haase, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891637.pdf
    Data publikacji:
    1991-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    61.10.
    64.70.Ew
    Opis:
    X-ray diffraction method has been used to study the molecular organization in 4-n-pentyl-4'-cyano-p-terphenyl doped with guest dye molecules. It has been found that the dye with strong polar end group affects significantly the monomer to dimer ratio in the nematic phase of the liquid crystal studied.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 4; 545-552
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prenematic Self-Assembling of Mesogenic Molecules in Isotropic Liquid and Orientational Order in Nematic Phase
    Autorzy:
    Wolarz, E.
    Bauman, D.
    Jadżyn, J.
    Dąbrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493609.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Df
    61.30.Gd
    77.22.Ch
    Opis:
    Dielectric relaxation study of nematogenic 4-n-alkyl-4'-cyanobiphenyls (nCB, n = 5, 6), 4-(trans-4'-n-alkylcyclohexyl)isothiocyanatobenzenes (nCHBT, n = 6, 8), 4-cyanophenyl-4'-n-alkylbenzoates (nCPB, n = 6, 8), 4-cyano-3-fluorophenyl-4'-n-octyloxybenzoate (8OCFPB), and 4-cyanophenyl-4'-n-octyloxy-3'-fluorobenzoate (8OCPFB) was performed in the frequency range from 50 kHz to 100 MHz in the nematic and isotropic phases. The static permittivity and the relaxation process related to the rotation of molecules around their short axis was analyzed. For some of these liquid crystals anomalous temperature dependence of static permittivity in the pretransitional region of the isotropic phase was observed. Based on the Meier-Saupe-Martin model of molecular diffusion in nematics, the orientational order parameter 〈$P_2$〉 was determined from dielectric relaxation times and retardation factor. The values of 〈$P_2$〉 calculated from the dielectric relaxation data were compared with the results obtained from measurements of polarized electronic absorption. Correlations between the magnitude of the dielectric pretransitional effect and the orientational order in the nematic phase were discussed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 447-454
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric and Optical Studies of Homologous Series of Bicyclo[2,2,2]octane Derivatives with -NCS Terminal Group
    Autorzy:
    Herba, H.
    Żywucki, B.
    Czechowski, G.
    Bauman, D.
    Wąsik, A.
    Jadżyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933452.pdf
    Data publikacji:
    1995-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    77.22.Ch
    78.20.Fm
    Opis:
    The static dielectric constants and the optical birefringence for four members of the homologous series of bicyclo[2,2,2]octane derivatives with -NCS terminal group (pentyl to octyl) have been measured as a function of temperature. From the dielectric anisotropy, the optical birefringence as well as the polarized absorption spectra of the dichroic dye dissolved in the liquid crystalline host the order parameter has been determined. The results obtained by using various experimental methods have been compared with those calculated from the Maier-Saupe mean field theory. It has been found that the order parameter for the successive homologues shows alternation similar to that exhibited for the nematic-isotropic transition temperature.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 6; 985-994
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Study of Orientational Order of Some Liquid Crystals from Various Homologous Series
    Autorzy:
    Bielejewska, N.
    Chrzumnicka, E.
    Mykowska, E.
    Przybylski, R.
    Szybowicz, M.
    Władysiak, K.
    Bauman, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047169.pdf
    Data publikacji:
    2006-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    33.20.Fb
    33.20.Kf
    33.50.Dq
    Opis:
    The long-range orientational order of liquid crystals from homologous series of 4-n-alkyl-4'-cyanobiphenyl, 4-n-alkoxy-4'-cyanobiphenyl, trans-4-n-alkyl(4'-cyano-phenyl)-hexane, and 4-(trans-4'-n -alkylcyclohexyl)-isothiocyanato-benzene was studied by means of classical methods of optical spectroscopy: absorption of the polarized light, fluorescence depolarization, and Raman scattering depolarization. The absorption, emission, and Raman scattering spectra of linearly polarized light were recorded as a function of temperature in the whole range of the mesophase. On the basis of these spectra the order parameters ⟨P$\text{}_{2}$⟩ and ⟨P$\text{}_{4}$⟩ as well as the orientational distribution function were determined. The results obtained for members of various series with the same number of carbon atom in the alkyl chain were compared. It was found that the orientational order of liquid crystal molecules depends on the structure of the rigid core, on the kind of the terminal group as well as on the alkyl chain length. The odd-even effect for the order parameters, explained as the alteration of interaction between alkyl chains, was observed.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 6; 777-793
    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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