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A Liquid Crystal Elastomer-Based Unprecedented Two-Way Shape-Memory Aerogel.

Meng Wang1, Ying Song1, Hari Krishna Bisoyi2

  • 1Institute of Advanced Materials, School of Chemistry and Chemical Engineering, and Jiangsu Hi-Tech Key Laboratory for Biomedical Research, Southeast University, Nanjing, 211189, China.

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Summary

This study introduces the first two-way shape-memory aerogel using liquid crystal elastomers (LCEs). This novel material exhibits reversible shape deformation, paving the way for advanced actuators and sensors.

Keywords:
aerogelsliquid crystal elastomersshape-morphing materialstwo-way shape-memory aerogels

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Two-way shape-memory aerogels offer reversible shape-morphing capabilities for advanced applications.
  • Existing polymer aerogels typically exhibit one-way shape deformation.

Purpose of the Study:

  • To develop the first two-way shape-memory aerogel based on liquid crystal elastomers (LCEs).
  • To investigate the material's properties and potential applications in actuators and sensors.

Main Methods:

  • An orthogonal heat and light curing strategy was employed.
  • An intermediate mechanical stretching step was utilized.
  • Characterization included differential scanning calorimetry, temperature-varied wide-angle X-ray scattering, and polarizing optical microscopy.

Main Results:

  • The LCE-based aerogel exhibits a liquid crystal phase with well-oriented mesogens.
  • The material demonstrates superior compressibility and excellent shape stability.
  • A reversible shape deformation with a 37% shrinkage ratio was achieved during heating/cooling cycles.

Conclusions:

  • This work presents a novel LCE-based aerogel with true two-way shape-memory behavior.
  • The material's properties support potential applications in control devices and soft actuators.