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Ordered-Porous-Array Polymethyl Methacrylate Films for Radiative Cooling.

Guiguang Qi1, Xinyu Tan1, Yiteng Tu1

  • 1Collaborative Innovation Center for New Energy Microgrid, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Electrical Engineering & New Energy, China Three Gorges University, Yichang, Hubei 443002, P. R. China.

ACS Applied Materials & Interfaces
|June 30, 2022
PubMed
Summary
This summary is machine-generated.

This study presents an ordered-porous-array polymethyl methacrylate (OPA-PMMA) film for passive radiative cooling. The material achieves significant cooling by reflecting sunlight and emitting heat, offering a low-cost solution.

Keywords:
atmosphere transparent windowsordered porous arraypassive radiative coolingpolymethyl methacrylatereflectivity and emissivity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermodynamics

Background:

  • Passive radiative cooling leverages atmospheric transparency windows to dissipate heat.
  • Developing efficient materials for radiative cooling is crucial for sustainable thermal management.

Purpose of the Study:

  • To design and investigate an ordered-porous-array polymethyl methacrylate (OPA-PMMA) film for enhanced passive radiative cooling.
  • To evaluate the optical properties and cooling performance of the developed OPA-PMMA film.

Main Methods:

  • Fabrication of OPA-PMMA films using a one-step, low-cost process.
  • Characterization of optical properties, including solar reflectance and mid-infrared emissivity.
  • Outdoor testing to measure surface temperature reduction compared to control samples.

Main Results:

  • Achieved ultra-high emissivity (98.4%) in the 3-25 μm range and good solar reflectance (85%) in the 0.2-2.5 μm range.
  • Demonstrated significant surface temperature reduction: 16 °C below smooth PMMA and 8.6 °C below commercial white paint.
  • The ordered-porous-array structure was identified as key to improved performance.

Conclusions:

  • The OPA-PMMA film exhibits excellent passive radiative cooling properties.
  • The low-cost, scalable fabrication process makes it suitable for practical applications.
  • This technology holds promise for energy-efficient cooling in buildings, textiles, and equipment.