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Updated: Jun 4, 2025

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
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Hydrogen-bonded multi-mode liquid crystal elastomer actuators.

Roshan Nasare1, Hongshuang Guo1, Arri Priimagi1

  • 1Smart Photonic Materials, Faculty of Engineering and Natural Sciences, Tampere University, Tampere, P.O. Box 541, FI-33101, Finland. hongshuang.guo@tuni.fi.

Journal of Materials Chemistry. B
|January 3, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new liquid crystal elastomer (LCE) with shape memory, humidity sensitivity, and light-activated movement. This adaptable material offers versatile soft actuator applications in various environments.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Liquid crystal elastomers (LCEs) are advanced materials known for stimuli-responsive and reversible shape-changing properties.
  • Incorporating dynamic bonds into LCEs enhances programmable shape morphing and environmental adaptability.
  • Novel designs for dynamic LCEs are crucial for expanding their applications.

Purpose of the Study:

  • To develop a supramolecular LCE with integrated shape memory programming, humidity sensitivity, and photochemical actuation.
  • To explore the dual functionality of LCEs by manipulating supramolecular crosslinks.
  • To demonstrate versatile soft actuator capabilities in different environmental conditions.

Main Methods:

  • Fabrication of a supramolecular LCE utilizing hydrogen bonding crosslinks for shape memory and photochemical actuation.
  • Chemical treatment (base treatment) to break supramolecular crosslinks, inducing hygroscopic and humidity-sensitive properties.
  • Testing of soft actuator performance in both dry and wet conditions, under light stimulus.

Main Results:

  • The developed LCE exhibits shape memory functionality, allowing for programmable arbitrary shapes and photochemical actuation.
  • Base treatment reversibly transforms the LCE into a hygroscopic material sensitive to humidity changes, while retaining photochemical deformability.
  • Demonstrated distinct soft actuator behaviors in air and underwater, highlighting the material's versatility.

Conclusions:

  • The supramolecular LCE offers a unique combination of shape memory, humidity sensitivity, and photochemical control.
  • The ability to switch between different responsive states enhances the programmability and applicability of LCE-based soft actuators.
  • This work expands the design space for dynamic LCEs, paving the way for sophisticated biomimetic devices.