Phase effect on formation of intermediates in the pulse radiolysis of 4-cyano-4'- octylbiphenyl liquid crystals

Kato, Noriyuki; Kawai, Yukihiro; Matsushima, Masato; Miyazaki, Tsuyoshi; Fueki, Kenji

doi:10.1016/1359-0197(86)90005-6

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2008

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“…The initial 420 nm and 480 nm peaks vanish, along with a growth of the 360 nm absorption peak. The transient absorption spectra of 5CB obtained by us fairly match with those reported by Kato et al [15].…”

Section: Resultssupporting

confidence: 79%

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

Rath

Sarkar

Wadhawan

et al. 2008

Opto-Electronics Review

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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 (Δε′=ε∥′−ε⊥′ ). These studies show that 5CB is prone to substantial radiation damage on exposure to the beam of high-energy electrons.

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Section: Resultssupporting

confidence: 79%