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Electron beam irradiation induced changes in liquid-crystal compound 5CB

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Warianty tytułu
Konferencja
Conference on Liquid Crystals : Chemistry, Physics and Applications ; (17 ; 09.2007 ; Augustów, Poland)
Języki publikacji
EN
Abstrakty
EN
Electron beam irradiation studies on liquid crystal material 5CB have been carried out at a temperature where the compound exists in the isotropic liquid phase. In situ time-resolved spectroscopic characterization was carried out during the irradiation. Three different transients were observed during the 2-μs electron pulse. After about 50 μs, only one transient species was found to be present, which has an absorption peak at 360 nm. Radiolysed sample exhibits a broad absorption at ∼ 400 nm. The dielectric measurements show that even a low level of irradiation results in a dramatic increase in the component of dielectric permittivity normal to the long axes of the molecules ε ⊥', and a corresponding decrease in the dielectric anisotropy (Δ ε'=ε II — ε ⊥'). These studies show that 5CB is prone to substantial radiation damage on exposure to the beam of high-energy electrons.
Twórcy
autor
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autor
  • Bhabha Atomic Research Centre, Radiation & Photochemistry Division, Trombay, Mumbai, India
Bibliografia
  • 1. M.V. Kurik., O.D. Lavrentovich, B.A. Linev, and C.D. Shulga, “Change in phase diagram of LC under the effect of ionizing radiation”, J. Chem. Phys. (Russian) 61, 1634 (1987).
  • 2. S.L. Srivastava, R. Dhar, and M.V. Kurik, “Change in electrical and thermodynamical properties of cholestryl myristate on irradiation”, Mol. Mater. 02, 261-273 (1993).
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  • 4. S.L. Srivastava and R. Dhar, “Disordering by -irradiation on long range order of liquid crystalline phases of cholesteryl esters”, AIP Conf. Proc. 286, 282 (1994).
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  • 6. S.L. Srivastava, R. Dhar, and M.V. Kurik, “Change in optical and dielectric properties of cholesteryl myristate on -irradiation”, Mol. Mater. 12, 295-304 (2000).
  • 7. D.A. Dunmur, M.R. Manterfield, W.H. Miller, and J.K. Dunleavy, “The dielectric and optical properties of the homologous series of cyano-alkyl-biphenyl liquid crystals”, Mol. Cryst. Liq. Cryst. 45, 127-144 (1978); http://liqcryst.chemie.uni-hamburg.de/en/lc_data.php
  • 8. S.N. Guha, P.N. Moorthy, K. Kishore, D.B. Naik, and K.N. Rao, “One-electron reduction of thionine studied by pulse radiolysis”, Proc. Indian Acad. Sci. (Chem. Sci.) 99, 261 (1987).
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  • 12. R. Dhar, M. Gupta, V.K. Agrawal, and M.K. Singh, “Dielectric anisotropy and relaxation studies of the homologous series of N-(4-n-alkyloxy-2-hydroxy-benzylidene)-4-carbethoxyaniline”, Phase Transit. 81, 341-359 (2008).
  • 13. E. Hayon, “Yield of ions and excited states produced in the radiolysis of polar organic liquids”, J. Chem. Phys. 53, 2353 (1970).
  • 14. J.W.T. Spinks and R.J. Woods, An Introduction to Radiation Chemistry, John Wiley, New York, 1976.
  • 15. N. Kato, Y. Kawai, M. Matsushima, T. Miyazaki, and K. Fueki, “Phase effect on formation of intermediates in the pulse radiolysis of 4-cyano-4'-octylbiphenyl liquid crystals”, Radiat. Phys. Chem. 27, 13 (1986).
  • 16. R. Dhar, R. Verma, M.C. Rath, S.K. Sarkar, V.K. Wadhawan, R. Dąbrowski, and M. Tykarska, “Tuning of the electrical parameters of a twisted-nematic display material by using electron beam irradiation”, Appl. Phys. Lett. 92, 014108 (2008).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA0-0036-0009
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