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Related Concept Videos

Thermosensation01:43

Thermosensation

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Bidirectional Thermochromic Hydrogel with Wide Response Temperature Regulation for Smart Windows.

Yong Hu1, Qiaoyu Huang1, Hong Chen1

  • 1Ministry-of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei Key Laboratory for Precision Synthesis of Small Molecule Pharmaceuticals, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China.

ACS Applied Materials & Interfaces
|August 7, 2025
PubMed
Summary

New composite hydrogels create dual-responsive smart windows. These advanced thermochromic windows adjust to both cold and warm temperatures, enhancing energy efficiency and privacy for buildings in diverse climates.

Keywords:
bidirectional temperature responseenergy savingprivacy protectionsmart windowswide response temperature regulations

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Area of Science:

  • Materials Science
  • Energy Science
  • Building Technology

Background:

  • Thermochromic smart windows are crucial for building energy management but typically respond to a single temperature.
  • Existing smart windows struggle to meet simultaneous energy-saving and privacy requirements due to fixed temperature responses.

Purpose of the Study:

  • To develop novel composite hydrogels with bidirectional temperature-responsive properties for advanced smart windows.
  • To create climatic-adaptable smart windows capable of meeting diverse energy-saving and privacy needs across various climates.

Main Methods:

  • Synthesized composite hydrogels (KNSG) using poly(N-isopropylacrylamide/glycerol) matrix with sodium dodecyl sulfate/sodium chloride micelles and κ-carrageenan.
  • Encapsulated hydrogels between glass panes to create smart window prototypes.
  • Optimized material composition to tune upper critical solution temperature (UCST) and lower critical solution temperature (LCST).

Main Results:

  • Achieved tunable UCST (0.8-17.4 °C) and LCST (19.5-50.4 °C) for broad climate adaptability.
  • Demonstrated excellent solar modulation (ΔTSol, UCST = 76.17%, ΔTSol, LCST = 76.29%) with high transparency (94.90%).
  • Exhibited remarkable stability and antifreezing properties down to -28 °C.

Conclusions:

  • Developed dual-responsive smart windows offer a promising solution for balancing solar modulation and natural light.
  • These windows provide effective energy efficiency, privacy control, and potential applications in information encryption and temperature monitoring.
  • The tunable nature of the hydrogels ensures long-term usability and adaptability to human thermal comfort zones and global climates.