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Related Experiment Videos

Trans-cis isomerization and the blue phases.

Andro Chanishvili1, Guram Chilaya, Gia Petriashvili

  • 1Institute of Cybernetics of the Georgian Academy of Sciences, Euli Str. 5, 0186 Tbilisi, Georgia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
Summary

Photoactive chiral liquid crystals exhibit unique blue phase behaviors under UV light, including wavelength modulation and phase transitions. These changes are linked to light-induced molecular isomerization.

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Area of Science:

  • Liquid Crystal Physics
  • Photochemistry
  • Materials Science

Background:

  • Blue phases are temperature-sensitive liquid crystal phases.
  • Photoactive materials can undergo reversible structural changes upon light exposure.
  • Chiral dopants influence liquid crystal phase behavior.

Purpose of the Study:

  • To investigate the impact of photoinduced trans-cis isomerization on blue phases in liquid crystals.
  • To explore the modulation and induction of blue phases using UV and visible light.
  • To understand the role of molecular isomer ratios in observed phenomena.

Main Methods:

  • Utilized a novel class of photoactive chiral liquid crystals (nematic host + chiral dopant).
  • Exposed liquid crystal mixtures to UV and visible light.

Related Experiment Videos

  • Analyzed changes in selective reflection wavelength and phase transitions.
  • Investigated four different mixtures, including supercooled blue phases.

    • Main Results:

    • Observed modulation of blue phase selective reflection wavelength with light.
    • Demonstrated conversion between different blue phases upon UV irradiation.
    • Induced blue phases via UV light even when thermodynamically unstable.
    • Noted distinct behavior of the supercooled blue phase.

    Conclusions:

    • The behavior of blue phases under photoirradiation is sensitive to external parameters.
    • Results are qualitatively explained by the ratio of cis (non-nematogenic) to trans (nematogenic) isomers.
    • Photoactive liquid crystals offer tunable control over blue phase properties.