Autor: Chrzumnicka, E. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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