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Light-Actuated Liquid Crystal Elastomer Prepared by Projection Display.

Juan Chen1, Oluwafemi Isaac Akomolafe1, Jinghua Jiang1

  • 1Department of Physics and Materials Science, The University of Memphis, Memphis, TN 38152, USA.

Materials (Basel, Switzerland)
|December 10, 2021
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Summary

Researchers developed a simple photopatterning technique to precisely control molecular orientations in liquid crystal elastomers (LCEs). This method enables programmable 3D shape morphing in LCE films for advanced applications.

Keywords:
director fieldlight-drivenliquid crystal elastomersphotopatterning

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Biomedical Engineering

Background:

  • Programmable soft materials are crucial for applications like drug delivery and tissue engineering.
  • Liquid crystal elastomers (LCEs) offer shape-morphing capabilities in response to stimuli.
  • Precise control over molecular orientation in LCEs is key for programming 2D to 3D transformations.

Purpose of the Study:

  • To introduce a simplified photopatterning method for creating spatially varying molecular orientations in LCE films.
  • To demonstrate the fabrication of diverse topological defect configurations in LCEs.
  • To showcase the programmable shape-morphing abilities of LCEs.

Main Methods:

  • Utilized a maskless projection display system for photopatterning LCE films.
  • Employed synchronized rotations of polarizers and projected images to control molecular alignment.
  • Fabricated various configurations of topological defects, including individual defects and 2D lattices.

Main Results:

  • Achieved precise control over molecular orientations within LCE films.
  • Successfully created diverse patterns of topological defects without masks or waveplates.
  • Demonstrated shape transformations into a cone and a truncated square pyramid.
  • Showcased functionality mimicking the responsive Mimosa Pudica.

Conclusions:

  • The proposed photopatterning technique offers a simplified approach to programming LCEs.
  • Programmable LCE morphing behaviors open new avenues for soft robotics and smart devices.
  • This method facilitates the creation of complex 3D structures from 2D LCE sheets.