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Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Structurally Colored Photonic Janus Films for Switchable Radiative Cooling and Solar Heating.

Wei Wei1, Hengrui Gu1, Xingchen Zhao1

  • 1State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

Nanomaterials (Basel, Switzerland)
|May 26, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a photonic Janus film for personal thermal management. The innovative material offers switchable radiative cooling and solar heating, adapting to changing environments while maintaining tunable visual appearance.

Keywords:
photonic Janus filmsradiative coolingsolar heatingstructural colorswitchable thermal regulation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Personal thermal management (PTM) systems often lack adaptability and tunable optical properties.
  • Existing PTM solutions are typically limited to single-mode (cooling or heating) operation.

Purpose of the Study:

  • To develop a dual-mode material for PTM with switchable cooling and heating capabilities.
  • To integrate tunable optical appearance with thermal regulation in a single platform.

Main Methods:

  • Fabrication of a Janus film using cellulose nanocrystal (CNC) photonic structures for cooling and a carbon nanotube (CNT) layer for heating.
  • Utilizing pitch modulation in CNC structures for tunable structural color and mid-infrared emissivity.
  • Employing CNTs for high solar absorptivity and incorporating Joule heating.

Main Results:

  • The film demonstrates switchable radiative cooling (high mid-infrared emissivity up to 0.91) and efficient solar heating (~92% absorptivity).
  • Tunable structural color was achieved on the cooling side without compromising performance.
  • Reversible switching between cooling and heating modes was accomplished by flipping the film.

Conclusions:

  • The developed photonic Janus film offers a viable solution for wearable microclimate control.
  • This dual-mode system integrates optical tunability with switchable thermal regulation for adaptive PTM.
  • The material's compatibility with continuous fabrication enables scalable production.