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Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
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Published on: May 20, 2018

Azophenol-based liquid-crystalline elastomers for light-driven actuators.

Jaume Garcia-Amorós1, Alexandra Piñol, Heino Finkelmann

  • 1Grup de Materials Orgànics, Institut de Nanociència i Nanotecnologia, Departament de Química Orgànica, Universitat de Barcelona , Martí i Franqués 1-11, E-08028, Barcelona, Spain.

Organic Letters
|April 9, 2011
PubMed
Summary
This summary is machine-generated.

Para-substituted azophenols demonstrate rapid cis-to-trans isomerization, enabling light-controlled actuators. These azophenol liquid crystal elastomers show fast 1-second relaxation times, useful for opto-mechanical applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optoelectronics

Background:

  • Para-substituted azophenols are known for fast thermal cis-to-trans isomerization in solution.
  • Transferring this photo-isomerization behavior to the solid state is crucial for developing advanced materials.

Purpose of the Study:

  • To investigate the potential of azophenol-containing liquid crystal elastomers for light-controlled actuation.
  • To explore the mechanism of isomerization in the solid state, compensating for the absence of protic solvents.

Main Methods:

  • Synthesis of liquid-crystalline elastomeric systems incorporating para-substituted azophenols.
  • Opto-mechanical experiments to evaluate actuation performance and relaxation times.
  • Analysis of hydrogen bonding interactions between azophenol monomers in the solid state.

Main Results:

  • Azophenol-based liquid single-crystal elastomers exhibit efficient light-controlled actuation.
  • Fast relaxation times of 1 second at room temperature were achieved.
  • Hydrogen bonding between azophenol monomers effectively compensates for the lack of protic solvents, enabling solid-state isomerization.

Conclusions:

  • Azophenol-containing liquid crystal elastomers are promising materials for light-controlled actuators.
  • The established hydrogen bonding network is key to achieving fast photo-mechanical responses in the solid state.
  • These materials offer a viable platform for developing responsive opto-mechanical devices.