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Bionic dual-scale structured films for efficient passive radiative cooling accompanied by robust durability.

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Researchers developed durable bionic films for passive radiative cooling (PRC) inspired by scallop shells. These films efficiently reflect sunlight and emit heat, achieving significant sub-ambient cooling even in harsh conditions.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomimetics

Background:

  • Passive radiative cooling (PRC) offers an energy-free method for cooling, inspired by natural organisms. Achieving durable materials for practical PRC applications remains a challenge.
  • The inner surface of Hawaiian scallop shells exhibits remarkable thermoregulatory properties, offering a blueprint for advanced cooling materials.

Purpose of the Study:

  • To develop highly efficient and durable bionic dual-scale structured (BDSS) films for passive radiative cooling.
  • To mimic the natural thermoregulatory principles found in scallop shells for enhanced cooling performance.

Main Methods:

  • Investigated the micro/nanostructure of Hawaiian scallop shell inner surfaces to understand their thermoregulatory mechanisms.
  • Fabricated BDSS films by replicating the dual-scale structure (large triangular ridges with small terrace steps).
  • Characterized the optical properties (solar reflectivity, mid-infrared emissivity) and cooling performance of the fabricated films.

Main Results:

  • The BDSS films achieved a high solar spectrum reflectivity of 0.95 and a mid-infrared emissivity of 0.98.
  • Demonstrated a sub-ambient cooling of 10.8 °C under direct sunlight.
  • The films exhibited excellent durability, including self-cleaning, flexibility, mechanical strength, chemical stability, and UV resistance.

Conclusions:

  • Bionic dual-scale structures inspired by scallop shells can significantly enhance passive radiative cooling efficiency and durability.
  • The developed BDSS films show great potential for thermal management in diverse and challenging environments.
  • This study highlights the effectiveness of biomimicry in designing advanced materials for energy-free cooling solutions.