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Scalable, Controlled Bimodal Pore-Structured Polymer Coating for Efficient Passive Daytime Radiative Cooling.

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A new polyurethane coating with nano-aluminum oxide particles provides efficient outdoor cooling. This material reflects solar heat and transmits thermal radiation, reducing temperatures by up to 11°C without high energy use.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Public Health

Background:

  • Outdoor thermal irritation and heat waves present significant public health challenges.
  • Achieving carbon neutrality necessitates energy-efficient, localized cooling solutions.
  • Developing advanced materials is crucial for sustainable societal development.

Purpose of the Study:

  • To develop a novel, rapidly formable coating for efficient outdoor cooling.
  • To enhance solar reflectance and thermal radiation transmission for passive cooling.
  • To create a comfortable thermal microclimate mitigating heat stress.

Main Methods:

  • Fabrication of a polyurethane-based coating with bimodal spherical micropores.
  • Incorporation of nano-aluminum oxide (Al2O3) particles to tune optical properties.
  • Characterization of solar reflectance and thermal radiation transmission.

Main Results:

  • The coating achieved 93% solar irradiance reflection and 95% thermal radiation transmission (8-13 μm).
  • Demonstrated localized cooling, reducing daytime temperatures by 6-11 °C.
  • The coating exhibits ultrawide material compatibility and adaptive mechanical strength.

Conclusions:

  • The developed polyurethane coating offers an energy-efficient solution for outdoor cooling.
  • This technology supports sustainable development goals by addressing heat stress and energy consumption.
  • Potential applications span public health, economics, and various industrial fields.