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Hierarchically structured passive radiative cooling ceramic with high solar reflectivity.

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A novel cellular ceramic achieves passive radiative cooling with 99.6% solar reflectivity and high thermal emissivity. This durable material offers significant energy-saving potential for widespread applications, especially in building construction.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermodynamics

Background:

  • Passive radiative cooling technologies face limitations in cost, compatibility, weather resistance, and solar reflection.
  • Existing nanophotonic structures are expensive and difficult to integrate, while polymeric alternatives degrade and reflect poorly.

Purpose of the Study:

  • To develop a novel passive radiative cooling material with enhanced performance and durability.
  • To overcome the limitations of current radiative cooling technologies for practical applications.

Main Methods:

  • Development of a cellular ceramic structure engineered for high light scattering.
  • Characterization of the ceramic's solar reflectivity, thermal emissivity, and cooling performance.
  • Evaluation of material properties including color, weather resistance, mechanical robustness, and Leidenfrost effect suppression.

Main Results:

  • The developed cellular ceramic exhibits near-perfect solar reflectivity (99.6%) and high thermal emissivity.
  • Achieved continuous subambient cooling with a cooling power exceeding 130 W/m² under direct sunlight.
  • Demonstrated excellent weather resistance, mechanical robustness, and suppressed the Leidenfrost effect.

Conclusions:

  • The cellular ceramic offers a durable and versatile solution for passive radiative cooling.
  • The material's performance and properties facilitate commercialization, particularly for building construction.
  • This technology presents significant global energy-saving potential through efficient cooling solutions.