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Time-Temperature Integrating Optical Sensors Based on Gradient Colloidal Crystals.

Marius Schöttle1, Thomas Tran1, Tanja Feller1

  • 1Department of Chemistry, Physical Chemistry I, University of Bayreuth, Universitätsstr. 30, 95447, Bayreuth, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|August 21, 2021
PubMed
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New colloidal crystal-based time-temperature integrators offer autonomous, manipulation-free temperature monitoring. This optical readout technology is ideal for food spoilage and battery safety, enabling long-term tracing and threshold applications.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Autonomous temperature monitoring is crucial for food safety and battery integrity.
  • Optical readout methods are desirable for simple, low-tech visual inspection.

Purpose of the Study:

  • To introduce a novel concept for time-temperature integrators using colloidal crystals.
  • To combine controllable film-formation kinetics with linear gradient-based local readout.

Main Methods:

  • Utilizing tailor-made latex particles of identical size but varying glass transition temperatures.
  • Creating colloidal crystals with a gradual variation in particle mixture along a linear gradient.
  • Observing the disappearance of photonic stopband opalescence as an indicator of temperature exposure.
Keywords:
binary mixturesfilm formation kineticsinfusion withdrawal coatingphotonic crystalsstructural colors

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Main Results:

  • Demonstrated control over film-formation kinetics by orders of magnitude.
  • Established a direct correlation between local particle ratio, temperature, and time exposure.
  • Developed a sensing material capable of reporting both extended intermediate and short excessive temperature events.

Conclusions:

  • The colloidal crystal-based time-temperature integrators provide a versatile platform for autonomous temperature recording.
  • This technology is suitable for long-term tracing and threshold applications in food and battery safety.
  • The optical readout offers a low-tech solution for visual inspection of temperature history.