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Layered liquid crystal elastomer actuators.

Tyler Guin1,2, Michael J Settle3,4, Benjamin A Kowalski1,2

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

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|June 30, 2018
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Summary
This summary is machine-generated.

Researchers developed a new method to significantly boost the work capacity of liquid crystalline elastomers (LCEs), achieving nearly 20 J/kg. This advancement enables LCE actuators to lift over 2500 times their own weight.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Soft Robotics

Background:

  • Liquid crystalline elastomers (LCEs) are stimuli-responsive soft materials known for large shape changes.
  • Their out-of-plane work capacity has been a limiting factor for many actuator applications.
  • Developing methods to enhance LCE performance is crucial for advancing soft robotics and artificial muscles.

Purpose of the Study:

  • To develop a facile approach for enhancing the out-of-plane work capacity of LCEs.
  • To achieve a significant increase in the force output of LCE-based actuators.
  • To demonstrate the potential of these enhanced LCEs in lifting heavy loads.

Main Methods:

  • A room-temperature polymerizable composition was developed for LCE preparation.
  • Directed self-assembly was employed to organize LCE films with topological defect profiles.
  • LCE films were combined using the same composition as an adhesive.

Main Results:

  • The out-of-plane work capacity of LCEs was enhanced by an order of magnitude, reaching nearly 20 J/kg.
  • The developed LCE actuator demonstrated the ability to displace a load over 2500 times its own weight.
  • A displacement of nearly 0.5 mm was achieved with the enhanced LCE actuator.

Conclusions:

  • The facile approach significantly enhances the work capacity and force output of LCEs.
  • The developed LCE material and fabrication method show great promise for high-performance soft actuators.
  • This work paves the way for LCEs in applications requiring substantial force generation and heavy load displacement.