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Coral-Inspired Multi-Scale Porous Particle-Nested Structure for Efficient Colored Radiative Cooling.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive daytime radiative cooling (PDRC) is crucial for energy conservation and achieving carbon neutrality.
  • Developing colored PDRC materials that balance cooling performance with aesthetics for outdoor use is a significant challenge.

Purpose of the Study:

  • To engineer a novel polymer-based material for efficient colored passive daytime radiative cooling.
  • To address the limitations of current PDRC materials in terms of color and outdoor applicability.

Main Methods:

  • Fabrication of a polymer framework with a hierarchical pore-particle-nested structure.
  • Characterization of optical properties (solar reflectance, thermal emissivity) of the material and its colored variants.
  • Evaluation of mechanical and hydrophobic properties for outdoor suitability.

Main Results:

  • Achieved a solar reflectance of 93.6% and thermal emissivity of 91.1% for the base material.
  • Colored variants (blue, pink, yellow) demonstrated high solar reflectance (80.6%-88.1%).
  • The pore-particle-nested structure effectively scatters sunlight, enhancing cooling performance.

Conclusions:

  • The engineered polymer structure enables efficient colored PDRC films with high solar reflectance and thermal emissivity.
  • Enhanced mechanical and hydrophobic properties make the material suitable for practical outdoor applications.
  • This study presents a cost-effective strategy for developing aesthetically pleasing and high-performance PDRC materials.