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Correlating Mid-Infrared Absorption With Radiative Efficiency in Passive Daytime Radiative Cooling Systems.

Emma Spotorno1, Paola Stagnaro2, Lucia Conzatti2

  • 1OptMatLab, Dipartimento di Fisica, Università di Genova, Genova, Italy.

Macromolecular Rapid Communications
|June 18, 2026
PubMed
Summary
This summary is machine-generated.

Passive daytime radiative coolers (PDRCs) achieve cooling by emitting heat to space. This study shows that strong mid-infrared emission is key to efficient PDRC performance, providing a new assessment criterion.

Keywords:
optical propertiespolymer compositesradiative cooling

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Area of Science:

  • Materials Science
  • Optics
  • Thermodynamics

Background:

  • Passive daytime radiative coolers (PDRCs) enable cooling by reflecting sunlight and emitting thermal radiation to space.
  • Optimizing PDRCs requires specific optical properties across UV to mid-infrared wavelengths.
  • Key requirements include high solar reflectivity and selective mid-infrared emittance.

Purpose of the Study:

  • To fabricate PDRCs using silica-loaded poly(4-methyl-1-pentene) thin films.
  • To correlate the photonic properties of PDRCs with their radiative cooling efficiency.
  • To establish a quantitative criterion for assessing PDRC performance.

Main Methods:

  • Fabrication of PDRCs via hot-pressing silica-loaded poly(4-methyl-1-pentene) films onto silver-coated stainless-steel slabs.
  • Characterization of the photonic response (reflectivity and emittance) of the fabricated PDRCs.
  • Measurement and correlation of thermodynamic radiative efficiency with optical properties.

Main Results:

  • Demonstrated fabrication of PDRCs with tailored photonic properties.
  • Established a direct correlation between mid-infrared emittance and radiative power.
  • Showcased that strong mid-IR emittance leads to higher radiative efficiency at room temperature.

Conclusions:

  • The study provides a clear quantitative criterion for evaluating PDRC performance based on mid-infrared emittance.
  • Optimized photonic properties, particularly in the mid-IR, are crucial for effective passive cooling.
  • This research advances the development and assessment of efficient passive daytime radiative cooling technologies.