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A cold-responsive liquid crystal elastomer provides visual signals for monitoring a critical temperature decrease.

Yuanyuan Zhan1,2, Dirk J Broer1,2, Junyu Li3

  • 1Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Groene Loper 3, 5612 AE Eindhoven, The Netherlands. D.Liu1@tue.nl.

Materials Horizons
|April 26, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel cold-responsive material to monitor temperature decreases, crucial for cold-chain logistics. This new low critical temperature indicator helps prevent spoilage in food and medical supplies.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Temperature indicators are vital in healthcare and food safety, but most monitor high temperatures.
  • Low critical temperature indicators are scarce, despite their importance for preserving sensitive goods.

Purpose of the Study:

  • To develop a novel material system for monitoring temperature decreases, particularly for cold-chain applications.
  • To create a reliable low critical temperature indicator for perishable goods.

Main Methods:

  • Fabrication of a dynamic membrane using a gold-liquid crystal elastomer (Au-LCE) bilayer.
  • Utilizing a cold-responsive LCE that deforms upon cooling, causing stress and fracture in the gold layer.
  • Implementing material transport through cracks to trigger a visible signal, such as a pH indicator.

Main Results:

  • Demonstrated a functional Au-LCE membrane that fractures at a critical low temperature.
  • Enabled visible signal generation triggered by temperature decrease via material transport.
  • Successfully applied the system as a low critical temperature/time indicator for cold-chain monitoring.

Conclusions:

  • The developed Au-LCE membrane serves as an effective low critical temperature indicator.
  • This technology has significant potential for implementation in supply chains to reduce waste of perishable goods.
  • The cold-responsive nature of the LCE offers a unique approach to temperature monitoring.