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  • Optical switching of bent-core liquid crystals with azocinnamoyl units [Elektronski vir]
    Cmok, Luka, 1984- ...
    We report on observations of optical switching in bent-core liquid crystals possessing azocinnamoyl groups in both elongated side arms. UV-activated switching was observed in two of the synthesised ... materials, both of which were studied optically and with dielectric spectroscopy. Polarising microscopy was used to measure the changes in optical transmittance, and while no illumination effect was seen in the nematic phase, visible changes were observed in the smectic phase, most pronounced in the close vicinity of the smectic to nematic-phase transition. Switching dynamics was characterised, and we found that the average switching time varies strongly with temperature. The relaxation process is faster (below 200ms) and exhibits no significant temperature dependence. Dielectric measurements have shown that the observed smectic C phases were not polar with the molecules possessing a rather small electric dipole moment. Upon illumination, small differences in the dielectric permittivity were observed only in the smectic phase, suggesting that the illumination effect can be attributed to changes in the molecular conformational and orientational order.
    Vir: Liquid crystals [Elektronski vir]. - ISSN 1366-5855 (Vol. 50, iss. 7/10, 2023, str. 1599-1607)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 142935299

    Povezava(-e):

    https://www.tandfonline.com/doi/full/10.1080/02678292.2023.2179120
    Repozitorij Univerze v Ljubljani – RUL
    DOI

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