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Related Concept Videos

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Crystal Field Theory
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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Liquid Crystal Elastomer Waveguide Actuators.

Alexa S Kuenstler1, Hyunki Kim1, Ryan C Hayward1

  • 1Department of Polymer Science and Engineering, University of Massachusetts, Amherst, MA, 01003, USA.

Advanced Materials (Deerfield Beach, Fla.)
|April 24, 2019
PubMed
Summary
This summary is machine-generated.

Researchers used waveguided light to actuate liquid crystal elastomer (LCE) nanocomposites. This novel approach enables precise, multi-axis bending in LCEs without direct illumination, overcoming limitations of free-space light strategies.

Keywords:
actuatorsliquid crystal elastomersphotoresponsive materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Photomechanical actuation typically requires free-space illumination, limiting applications where direct line-of-sight is obstructed.
  • Liquid Crystal Elastomers (LCEs) are promising materials for light-driven actuators but face challenges in controlled actuation without direct light access.

Purpose of the Study:

  • To develop a method for actuating LCE nanocomposites using waveguided light.
  • To demonstrate precise control over the location and direction of actuation within LCE fibers.
  • To overcome the limitations of free-space illumination for photomechanical actuation.

Main Methods:

  • Synthesizing LCE nanocomposites incorporating plasmonic nanoparticles via photo-chemical reduction of gold salts.
  • Prescribing photoresponsive regions within mono-domain LCE fibers using controlled light delivery.
  • Utilizing localized photothermal heating from plasmonic nanoparticles absorbing waveguided light to induce inhomogeneous deformation.

Main Results:

  • Demonstrated the ability to create photoresponsive regions along the fiber axis and in the azimuthal direction within LCEs.
  • Achieved reversible, multi-axis bending actuation in LCE nanocomposites driven by waveguided light.
  • Showcased a novel actuation mechanism based on localized photothermal effects induced by plasmonic nanoparticles.

Conclusions:

  • Waveguided light can effectively drive actuation in LCE nanocomposites, offering a versatile alternative to free-space illumination.
  • The developed method allows for precise spatial control over light-induced deformation in LCEs.
  • This research expands the potential applications of LCEs in areas requiring remote or confined actuation.