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Efficient Passive Daytime Radiative Cooling by Hierarchically Designed Films Integrating Robust Durability.

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A new passive daytime radiative cooling film (PDRC) uses cost-effective materials for efficient solar reflection and thermal radiation. This durable, self-cleaning film achieves significant subambient cooling, promising for thermal management.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Passive daytime radiative cooling (PDRC) surfaces aim to reflect sunlight and emit thermal radiation to space for cooling without energy input.
  • Current PDRC technologies face challenges in fabrication complexity, cost, durability, and contamination.

Purpose of the Study:

  • To develop a cost-effective, durable, and highly efficient passive daytime radiative cooling film (HPRF).
  • To investigate the underlying mechanisms for enhanced radiative cooling performance.

Main Methods:

  • Fabrication of a hierarchical PDRC film using aluminum oxide (Al2O3) particles and polydimethylsiloxane (PDMS) via phase separation.
  • Characterization of optical properties, including solar reflectance and mid-infrared emittance.
  • Evaluation of cooling performance under direct solar irradiation and assessment of durability features.

Main Results:

  • The HPRF achieved a high solar reflectance of ~0.96 and mid-infrared emittance of ~0.95.
  • A significant subambient cooling of ~12.4 °C was demonstrated under direct sunlight.
  • The film exhibited excellent self-cleaning, flexibility, and anti-ultraviolet radiation properties.

Conclusions:

  • The developed HPRF offers a promising solution for efficient and durable passive radiative cooling.
  • The combination of hierarchical micro-/nanostructures, PDMS vibrations, and Al2O3 phonon polaritons enhances cooling.
  • The film's properties suggest broad applications in thermal management for electronics and wearables.