PL EN


Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników
Tytuł artykułu

Orientational behaviour of some homologues of 4-n-pentyl-phenylthio-4'-n-alkoxybenzoate doped with dichroic dye

Wybrane pełne teksty z tego czasopisma
Identyfikatory
Warianty tytułu
Konferencja
Thw 17th Conference on Liquid Crystals : Chemistry Physics and Applications ; (17 ; 09.2007 ; Augustów, Poland)
Języki publikacji
EN
Abstrakty
EN
The long-range orientational order of three members of 4-n-pentylphenylthio-4'-n-alkoxybenzoate (nS5) series doped with a dichroic dye was studied by means of electronic absorption and fluorescence measurements. The order parameters and as well as the orientational distribution function were determined on the basis of absorption and emission spectra of linearly polarized light recorded as a function of temperature in the nematic, smectic A, and smectic C phases. An influence of the dye molecular structure on the orientational order of the dye/liquid crystal mixture was observed. Moreover, the dependence of the order parameter values on the length of the alkoxy chain in liquid crystal molecules was found. It was shown that the order parameter , obtained from fluorescence measurements, can be helpful in recognizing the second-order or weakly first-order transitions between various liquid crystalline phases.
Twórcy
autor
autor
autor
Bibliografia
  • 1. P.G. De Gennes and J. Prost, The Physics of Liquid Crystals, Science Publication, Oxford, 1993.
  • 2. J.W. Goodby and G.W. Gray, “Guide to the nomenclature and classification of liquid crystals”, in Physical Properties of Liquid Crystals, pp. 17-23, edited by D. Demus, J. Goodby, G.W. Gray, H.W. Spiess, and V. Vill, Wiley-VCH, Weinheim, 1999.
  • 3. D. Dunmur and K. Toriyama, “Tensor properties of anisotropic materials”, in Physical Properties of Liquid Crystals, pp. 87-101, edited by D. Demus, J. Goodby, G.W. Gray, H.-W. Spiess, and V. Vill, Wiley-VCH, Weinheim, 1999.
  • 4. J. Charvolin and B. Deloche, “Nuclear magnetic resonance studies of molecular behaviour”, in The Molecular Physics of Liquid Crystals, pp. 342-366, edited by G.R. Luckhurst and G.W. Gray, Academic Press, London, New York, San Francisco, 1979.
  • 5. P.L. Nordio and U. Segre, “Magnetic resonance spectroscopy - static behaviour”, in The Molecular Physics of Liquid Crystals, pp. 367-384, edited by G.R. Luckhurst and G.W. Gray, Academic Press, London, New York, San Francisco, 1979.
  • 6. S. Jen, N.A. Clark, P.S. Pershan, and E.B. Priestley, “Polarized Raman scattering studies of orientational order in uniaxial liquid crystalline phases”, J. Chem. Phys. 66, 4635- 4661 (1977).
  • 7. L.L. Chapoy, D.B. du Pre, and E.T. Samulski, “The determination of moments of the orientational distribution function in liquid crystals by the depolarization of fluorescence of probe molecules”, in Liquid Crystals and Ordered Fluids, pp. 177-189, edited by J.F. Johnson and R.S. Porter, Plenum Press, New York, London, 1978.
  • 8. C. Zannoni, “Theory of time dependent fluorescence depolarization in liquid crystals”, Mol. Phys. 38, 1813-1827 (1979).
  • 9. D. Bauman, “The study of the guest effect on the nematic phase stabilization”, Mol. Cryst. Liq. Cryst. 159, 197-218 (1988).
  • 10. H.G. Kuball, R. Memmer, A. Strauss, M. Junge, G. Scherowsky, and A. Schönhofer, “Order parameter from UV spectra with incompletely polarized absorption bands”, Liq. Cryst. 5, 969-986 (1989).
  • 11. E. Wolarz and D. Bauman, “Polarized fluorescence studies of orientational order in some nematic liquid crystals doped with stilbene dye”, Mol. Cryst. Liq. Cryst. 197, 1-13 (1991).
  • 12. N. Bielejewska, E. Chrzumnicka, E. Mykowska, R. Przybylski, M. Szybowicz, K. Władysiak, and D. Bauman, “Comparative study of orientational order of some liquid crystals from various homologous series”, Acta Phys. Pol. A, 110, 777-793 (2006).
  • 13. D. Bauman, E. Chrzumnicka, and E. Wolarz, “Molecular orientation in liquid crystalline side chain polymers doped with dichroic dye as studied by optical spectroscopy methods”, Mol. Cryst. Liq. Cryst. 352, 67-76 (2000).
  • 14. J. Michl and E.W. Thulstrup, Spectroscopy with Polarized Light, VCH Publishers, Inc., New York, 1986.
  • 15. D.L. White and G.N. Taylor, “New absorptive mode reflective liquid-crystal display device”, J. Appl. Phys. 45, 4718-4723 (1974).
  • 16. R. Hertmanowski, Ł. Chudziński, T. Martyński, P. Stempniewicz, E. Wolarz, and D. Bauman, “Spectroscopic studies of Langmuir-Blodgett films of 3,4,9,10-tetra(heptyloxycarbonyl)perylene and its mixtures with a liquid crystal”, Liq. Cryst. 31, 791-800 (2004).
  • 17. H. Finkelmann and D. Day, “Structure of mesomorphic polymer phase”, Macromol. Chem. 180, 2269-2274 (1979).
  • 18. D. Bauman, E. Mykowska, A. Zięba, E. Chrzumnicka, G. Czechowski, and J. Jadżyn, “Orientational order in nematic, smectic A, and smectic C phases of 8S5 doped with dichroic dye”, Phase Transit. 80, 599-613 (2007).
  • 19. D. Bauman, E. Mykowska, and A. Zięba, “Study of orientational order of 10S5 in nematic and smectic phases by means of optical spectroscopy methods”, Mol. Cryst. Liq. Cryst., (in press).
  • 20. F.C. Saunders, L. Wright, and M.G. Clark, “Intermolecular guest-host interactions and the optical order parameter of pleochroic dyes”, in Liquid Crystals and Ordered Fluids, Vol. 4, pp. 831-852, edited by A.C. Griffin and J.F. Johnson, Plenum Press, New York, 1984.
  • 21. D. Bauman, J. Solczyński, and E. Chrzumnicka, “Guest effect on nematic-isotropic phase transition temperature of liquid crystal 6CHBT”, Acta Phys. Pol. A, 92, 1151-1161 (1997).
  • 22. D. Bauman and H. Moryson, “Guest-host interactions in dichroic dye-liquid crystal mixture in smectic A and nematic phases”, J. Mol. Struct. 404, 113-118 (1997).
  • 23. T.E. Lockhart, E. Gelerinter, and M.E. Neubert, “Measurements of refractive indices and their relation to orientational order at smectic-A - smectic-C transitions”, Phys. Rev. A, 25 2262-2271 (1982).
  • 24. A. Żywociński, S.A. Wieczorek, and J. Stecki, “High resolution volumetric study of the smectic A to nematic transition in 4-(n-pentyl)phenylthiol-4'-(n-octyloxy)benzoate (8S5) and octyloxycyanobiphenyl (8OCB)”, Phys. Rev. A, 36, 1901-1907 (1987).
  • 25. J. Chruoeciel, Molecular Movements in Liquid Crystal Phases, Publisher - the Higher Agriculture and Teacher Education School in Siedlce, 1996. (in Polish)
  • 26. A. Żywociński and S.A. Wieczorek, “Critical exponents for thermal expansion and isothermal compressibility near the nematic to smectic-A transition”, J. Phys. Chem. B, 101, 6970-6976 (1997).
  • 27. W. Maier and A. Saupe, “Eine einfache molekular-statistische Theorie der nematischen kristallinfluessigen Phase. Teil I.”, Z. Naturforsch. 14a, 882-889 (1959). (in German)
  • 28. R.L. Humphries, P.G. James, and G.R. Luckhurst, “Molecular field treatment of nematic liquid crystals”, J. Chem. Soc. Farad. T. 2 68, 1031-1044 (1972).
  • 29. H. Moryson, D. Bauman, and J. Jadżyn, “Order parameters in some nematics determined from optical spectroscopy”, Mol. Cryst. Liq. Cryst. 250, 63-71 (1994).
  • 30. L.G.P. Dalmolen, S.J. Picken, A.F. de Jong, and W.H. de Jeu, “The order parameters and in nematic p-alkyl-p’-cyanobiphenyls: polarized Raman measurements and the influence of molecular association”, J. Phys. 46, 1443-1449 (1985).
  • 31. W.J. Jones, D.K. Thomas, D.W. Thomas, and G. Williams, “Raman scattering studies of homogeneous and twisted-nematic liquid crystal cells and the determination of and order parameters”, J. Mol. Structure 614, 75-85 (2002).
  • 32. E. Chrzumnicka, M. Szybowicz, and D. Bauman, “Studies of orientational order of some nematogens by means of Raman scattering spectroscopy”, Z. Naturforsch. 59a, 510-516 (2004).
  • 33. P.P. Karat and N.V. Madhusudana, “Elastic and optical properties of some 4'-n-alkyl-4-cyanobiphenyls”, Mol. Cryst. Liq. Cryst. 36, 51-64 (1976).
  • 34. B.R. Ratna and R. Shashidar, “Dielectric dispersion in 4'-n-alkyl-4-cyanobiphenyls”, Mol. Cryst. Liq. Cryst. 42, 185-192 (1977).
  • 35. P.P. Karat and V.H. Madhusudana, “Elasticity and orientational order in some 4'-n-alkyl-4-cyanobiphenyls: Part II”, Mol. Cryst. Liq. Cryst. 40, 239-245 (1979).
  • 36. D. Bauman, “Optical and thermodynamic properties of mixtures of pleochroic dye with some alkyl-cyanobiphenyl liquid crystals”, Mol. Cryst. Liq. Cryst. 172, 41-50 (1989).
  • 37. S. Marcelja, “Chain ordering in liquid crystals. I. Even-odd effect”, J. Chem. Phys. 60, 3599-3604 (1974).
  • 38. W.L. McMillan, “Simple molecular model for the smectic A phase of liquid crystals”, Phys. Rev. A, 4, 1238-1246 (1971).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWAK-0013-0005
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.