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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
Published on: April 25, 2020
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Thermomechanically active electrodes power work-dense soft actuators
Angel Martinez1, Arul Clement1, Junfeng Gao1
11025 Benedum Hall, Department of Industrial Engineering, Swanson School of Engineering, University of Pittsburgh, PA 15261, USA. ravishm@pitt.edu.
Soft Matter
|December 17, 2020
Summary
Researchers explored how chain extender structure impacts liquid crystal elastomer (LCE) properties. They developed a composite material for enhanced thermomechanical actuation, achieving significant work output with electrical heating.
Area of Science:
- Materials Science
- Polymer Chemistry
- Soft Robotics
Background:
- Liquid crystal elastomers (LCEs) exhibit unique thermomechanical properties.
- Controlling LCE actuation requires understanding structure-property relationships.
- Integrating heating elements with LCEs can enhance performance.
Purpose of the Study:
- To investigate the influence of chain extender structure and composition on LCE thermomechanical properties.
- To develop a composite material platform for efficient thermomechanical actuation.
- To explore the use of LCE-liquid metal composites as self-heating actuators.
Main Methods:
- Synthesis of LCEs using thiol-acrylate Michael addition with varying chain extenders.
- Fabrication of LCE-liquid metal (LM) composites with integrated eGaIn heaters.
- Characterization of thermomechanical properties, actuation strains, and work output under varying loads and electrical inputs.
Main Results:
- A non-linear relationship between chain extender concentration and thermomechanical sensitivity was observed.
- LCE-LM composites demonstrated efficient conversion of electrical power to heat for actuation.
- Peak specific work production of ~2 J/kg was achieved with ~115 mW electrical power.
- Actuator performance improved under increasing loads, peaking at ~260x the actuator weight.
Conclusions:
- Chain extender engineering is crucial for tuning LCE thermomechanical response.
- LCE-LM composites offer a promising route to self-heating, high-performance actuators.
- The developed composite platform enables efficient energy conversion and tunable actuation modes.
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