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Scalable-Designed Photonic Metamaterial for Color-Regulating Passive Daytime Radiative Cooling.

Xiao-Qing Yu1, Fucheng Li1, Jiawei Wang1

  • 1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009, People's Republic of China.

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This study presents a scalable, color-regulating passive daytime radiative cooling (PDRC) coating. The high-performance PDRC material offers significant cooling power and temperature reduction, promoting energy efficiency and sustainability.

Keywords:
Assembly regulationMonodispersed latexesPassive daytime radiative coolingPhotonic crystalSub-ambient cooling

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive daytime radiative cooling (PDRC) methods are crucial for energy-efficient cooling.
  • Scalable and cost-effective PDRC solutions are needed to overcome current limitations.

Purpose of the Study:

  • To develop a sustainable, scalable, and color-regulating PDRC coating.
  • To address challenges in PDRC construction, appearance, cost, and efficiency.

Main Methods:

  • Fabrication of a high-crystallinity photonic metamaterial PDRC coating using poly(methyl methacrylate-butyl acrylate-methacrylic acid) latexes.
  • Construction of meter-scale PDRC coatings using industrial modes on diverse surfaces.

Main Results:

  • Achieved high solar reflectance (~0.94) and long-wave infrared emittance (~0.97).
  • Demonstrated a cooling power of ~95.5 W m⁻² and an average sub-ambient temperature drop of 5.3 °C.
  • Showcased leading performance in cooling, scalability, and cost-effectiveness compared to existing PDRC technologies.

Conclusions:

  • The developed PDRC coating offers a promising route for reducing carbon emissions and energy consumption.
  • This work enables practical, large-scale application of PDRC for sustainable cooling solutions.