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Colorimetric Sensor Based on Hydroxypropyl Cellulose for Wide Temperature Sensing Range.

Hoon Yi1, Sang-Hyeon Lee1, Dana Kim2

  • 1Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea.

Sensors (Basel, Switzerland)
|February 15, 2022
PubMed
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A new colorimetric temperature sensor uses hydroxypropyl cellulose and ethylene glycol for reliable, power-free temperature monitoring. This sensor works effectively at subzero temperatures, visualizing changes from -20 to 25 °C.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Colorimetric sensors offer power-free, direct visualization of surface temperatures.
  • Existing sensors are limited in their operational range, particularly at subzero temperatures.
  • A need exists for robust, wide-ranging temperature sensors for real-world applications.

Purpose of the Study:

  • To develop a novel colorimetric sensory system for wide-range temperature detection, including subzero conditions.
  • To create a simple, affordable, and reliable temperature monitoring solution.

Main Methods:

  • Fabrication of a sensory system using hydroxypropyl cellulose (HPC) and ethylene glycol.
  • Utilizing HPC's self-assembly into a temperature-responsive cholesteric liquid crystalline mesophase.
Keywords:
cholesteric liquid crystalcolorimetric sensorethylene glycolhydroxypropyl cellulose

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  • Employing ethylene glycol to prevent mesophase freezing at low temperatures.

    • Main Results:

    • The developed system quantitatively visualizes temperature changes across a wide range (-20 to 25 °C).
    • The sensor demonstrates repeatability in its temperature response.
    • The system operates effectively even below 0 °C without external power.

    Conclusions:

    • A simple, affordable, and reliable colorimetric temperature sensor has been successfully developed.
    • The sensor is suitable for monitoring temperatures in real-world environments, including subzero conditions.
    • This technology holds significant potential for various structural temperature-monitoring applications.