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Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
07:56

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Published on: September 20, 2017

Nonequilibrium liquid crystalline layered phase stabilized by light.

S Krishna Prasad1, Geetha G Nair, Gurumurthy Hegde

  • 1Centre for Liquid Crystal Research, Jalahalli, Bangalore 560013, India. skpras@gmail.com

The Journal of Physical Chemistry. B
|January 12, 2007
PubMed
Summary

Researchers discovered that UV light can induce a stable liquid crystal phase not found in thermal cycles. This photoinduced phase transition in liquid crystals offers new possibilities for photonic devices and understanding material behavior.

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Area of Science:

  • Condensed matter physics
  • Photonic materials science
  • Liquid crystal research

Background:

  • Photoinduced phase transitions are crucial for understanding condensed matter.
  • Liquid crystals are ideal for studying light-driven transitions due to their soft elasticity and birefringence.
  • Previously, light-induced phases always existed within the material's thermal phase diagram.

Purpose of the Study:

  • To investigate the induction and stabilization of a liquid crystal phase solely by UV light.
  • To explore temperature-UV intensity phase diagrams for photoactive liquid crystal mixtures.
  • To demonstrate light as a tunable parameter mimicking thermodynamic variables.

Main Methods:

  • Fabrication of guest-host ternary liquid crystal mixtures with photoactive azobenzene guests.
  • Mapping of temperature versus UV intensity phase diagrams.
  • Analysis of UV intensity thresholds for phase induction and concentration dependence.

Main Results:

  • A smectic A phase was induced and stabilized exclusively by UV light in a ternary mixture, an exception to previous findings.
  • Phase diagrams reveal UV intensity acting analogously to thermodynamic parameters like pressure.
  • The threshold UV intensity for the smectic A phase induction shows significant concentration dependence.

Conclusions:

  • This study presents the first documented instance of a photoinduced phase not present in the thermal cycle.
  • UV intensity can be utilized as a fine-tuning parameter, potentially leading to the observation of a double critical point.
  • The findings open new avenues for photonic device development and fundamental condensed matter research.