Конформацiйнi ефекти i спектри фотолюмiнесценцiї нанокомпозитiв рiдкий кристал 5CB–вуглецевi нанотрубки

Автор(и)

  • G. V. Klishevich Institute of Physics, Nat. Acad. of Sci. of Ukraine
  • N. D. Curmei Institute of Physics, Nat. Acad. of Sci. of Ukraine
  • N. I. Lebovka Institute for Biocolloidal Chemistry, Nat. Acad. of Sci. of Ukraine
  • V. I. Melnyk Institute of Physics, Nat. Acad. of Sci. of Ukraine

DOI:

https://doi.org/10.15407/ujpe61.11.0968

Ключові слова:

liquid crystals, luminescence, carbon nanotube, conformational changes

Анотація

У спектрах люмiнесценцiї рiдких кристалiв 5СВ i гетерокомпозитiв 5СВ–карбоновi нанотрубки виявленi характернi температурнi (10–300 К) залежностi змiщень максимумiв смуг, їх пiвширин та вiдносних iнтенсивностей. На основi комплексного аналiзу даних з люмiнесценцiї та вимiрiв диференцiальної скануючої калориметрiї показано, що особливостi, якi спостерiгаються, пов’язанi з полiморфними перетвореннями та конформацiйними змiнами молекул 5СВ.

Посилання

S.S. Minenko, L.N. Lisetski, A.I. Goncharuk, N.I. Lebovka, V.V. Ponevchinsky, M.S. Soskin. Aggregates of multiwalled carbon nanotubes in nematic liquid crystal dispersions: Experimental evidence and a physical picture. Functional Materials 17, No. 4, 454 (2010).

L.N. Lisetski, S.S. Minenko, V.V. Ponevchinsky, M.S. Soskin, A.I. Goncharuk, N.I. Lebovka. Microstructure and incubation processes in composite liquid crystalline material (5CB) filled with multiwalled carbon nanotubes. Materialwissenschaft und Werkstofftechnik 42, No. 1, 5 (2011) [DOI: 10.1002/mawe.201100721

K.P. Sigdel, G.S. Iannacchione. Effect of carbon nanotubes on the isotropic to nematic and the nematic to smectic – A phase transitions in liquid crystal and carbon nanotubes composites. Eur. Phys. J. E 34 (4), 1 (2011) https://doi.org/10.1140/epje/i2011-11034-7

V.V. Ponevchinsky, A.I. Goncharuk, V.I. Vasilyev, N.I. Lebovka, M.S. Soskin. Cluster self-organization of nanotubes in a nematic phase: The percolation behavior and appearance of optical singularities. JETP Lett. 91 (5), 241 (2010) https://doi.org/10.1134/S0021364010050085

C. David, D. Baeyens-Vobant. Absorption and fluorescence spectra of 4-cyanobiphenyl and 4-alkyl- or 4-alkoxysubstituted liquid crystalline derivatives. Mol. Cryst. Liq. Cryst. 59, 181 (1980) https://doi.org/10.1080/00268948008071422

T. Ikeda, S. Kurihara, S. Taruke. Excimer formation kinetics in liquid-crystalline alkylcyanobiphenyls. J. Phys. Chem. 94, 6550 (1990) [DOI: 10.1021/j100380a008

A.M. Klock, W Retting, J. Hofkens, M. van Damme, F.C. Schryrer. Excited state relaxation channels of liquidcrystalline cyanobiphenyls and a ring-bridged model compound. Comparison of bulk and dilute solution properties. J. of Photochem. and Photobiol. 85, 11 (1995) https://doi.org/10.1016/1010-6030(94)03881-T

K. Abe, A. Usami, K. Ishida, Y. Fukushima, T. Shigenari. Dielectric and fluorescence study on phase transitions in liquid crystal 5CB and 8CB. J. Korean Phys. Soc. 46, 220 (2005) https://doi.org/10.3938/jkps.46.220

S. Kato, B. Lee, C. Pac. Fluorescence behaviour of cyanobiphenyl liquid crystal molecules in liquid crystal/polymer composite films. Liq. Cryst. 22, 595 (1997) https://doi.org/10.1080/026782997209009

J.I. Kukielski. Molecular interactions of 4-n-alkyl-4-cyanobiphenyl detected in vibronic and vibrational spectra. J. Mol. Struct. 1–8, 478 (1998) https://doi.org/10.1016/S0022-2860(98)00760-1

Yu. Piryatinski, O. Yaroshchuk. Photoluminescence of pentyl-cyanobiphenyl in liquid-crystal and solid-crystal states. Opt. Spectrosc. 89, 860 (2000) https://doi.org/10.1134/1.1335034

O. Yaroshchuk, Yu. Piryatinski, L.A. Dolgov, T.V. Bednaja, D. Enke. Fluorescence of the nematic liquid crystal 5CB in nanoporous glasses. Opt. Spectrosc. 100, 394 (2006) https://doi.org/10.1134/S0030400X06030143

G.V. Klimusheva. Physical phenomena in liquid crystals at interaction with light fluxes of various intensities (in Russian). Ukr. J. Phys. 37, 1840 (1992).

T. Bezrodna, V. Melnyk, V.Vorobjov, G. Puchkovska. Low-temperature photoluminescence of 5CB liquid crystal. J. Lumin. 130, 1134 (2010) https://doi.org/10.1016/j.jlumin.2010.02.009

E.M. Aver’yanov, V.A. Zyikov, A.J. Korets, V.F. Shabanov, P.V. Adomenas. Critical increase of the bending fluctuations of molecules and the nematic-to-isotropic liquid phase transition. JETP Lett. 31, 480 (1980).

E.M. Aver’yanov, V.A. Zyikov, P.V. Adomenas. Conformational change induced in mesomolecules by smectic A-nematic-isotropic liquid phase transitions. JETP Lett. 33 (5), 248 (1981).

T. Mansar?e, R. Decressan, C. Gors, V. Dolganov. Phase transformations and dynamics of 4-cyano-4-pentylbiphenyl (5CB) by nuclear magnetic resonance, analysis differential scanning calorimetry, and wideangle X-ray diffraction analysis. Mol. Cryst. Liq. Cryst. 97, 382 (2002) https://doi.org/10.1080/713738756

S.C. Jain, S.A. Agnihotry, V.G. Bhide. Solid crystalline polymorphism in M-24. Mol. Cryst. Liq. Cryst. 88, 281 (1982) https://doi.org/10.1080/00268948208072599

N. Lebovka, V. Melnyk, Ye. Mamunya, G. Klishevich, A. Goncharuk, N. Pivovarova. Low temperature phase transformations in 4-cyano-4-pentylbiphenyl (5CB) filled by multiwalled carbon nanotubes. Physica E 52, 65 (2013) https://doi.org/10.1016/j.physe.2013.03.029

Завантаження

Опубліковано

2019-01-04

Номер

Розділ

М'яка речовина

Як цитувати

Статті цього автора (цих авторів), які найбільше читають