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All-Optical Control of Shape.

Brian R Donovan1,2, Valentina M Matavulj1,2, Suk-Kyun Ahn1,2

  • 1Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Dayton, OH, 45433-7750, USA.

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Summary
This summary is machine-generated.

Photoresponsive liquid crystal elastomers (LCEs) achieve persistent shape deformation using a novel o-fluorinated azobenzene monomer. This breakthrough enables long-lasting, light-controlled shape changes in advanced materials.

Keywords:
azobenzeneliquid crystal elastomersphotoresponsiveshape change

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optics

Background:

  • Photoresponsive liquid crystal elastomers (LCEs) are anisotropic materials.
  • LCEs exhibit large-scale deformations upon light exposure.
  • Azobenzene derivatives are commonly used photo-switchable units in LCEs.

Purpose of the Study:

  • To develop LCEs with persistent, light-induced shape deformations.
  • To investigate the influence of azobenzene functionalization on LCE photomechanics.
  • To achieve all-optical control over LCE shape changes.

Main Methods:

  • Preparation of surface-aligned, azobenzene-functionalized LCEs.
  • Utilizing a radical-mediated, thiol-acrylate chain transfer reaction.
  • Synthesis of LCEs with o-fluorinated, m-fluorinated, and classical azobenzene monomers.

Main Results:

  • An o-fluorinated azobenzene (oF-azo) LCE demonstrated persistent shape deformation exceeding 72 hours under UV irradiation.
  • The persistent deformation was attributed to the positional functionalization of the azobenzene monomer influencing isomerization kinetics.
  • Comparison with other azobenzene derivatives highlighted the unique properties of the oF-azo LCE.

Conclusions:

  • Positional functionalization of azobenzene monomers is critical for achieving persistent photomechanical responses in LCEs.
  • oF-azo LCEs offer a novel platform for long-lived, light-controlled shape deformations.
  • These materials enable all-optical control of shape deformation and restoration.