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Triple-Scale Structure-Induced Efficient Passive Radiative Cooling Combining Robust Anticondensation.

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Summary
This summary is machine-generated.

This study presents a novel triple-scale structure for passive radiative cooling, achieving significant subambient temperatures even in high humidity. The design enhances cooling efficiency and prevents condensation, offering durable thermal management solutions.

Keywords:
anticondensationdroplet dynamicspassive radiative coolingself-cleaningtriple-scale structure

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Optics

Background:

  • Passive radiative cooling offers energy-free subambient cooling by emitting thermal radiation to space.
  • Existing methods face challenges with anticondensation, limiting use in humid conditions.

Purpose of the Study:

  • To develop a passive radiative cooling design with robust anticondensation performance.
  • To investigate the effect of a triple-scale structure on cooling efficiency and durability.

Main Methods:

  • Fabrication of a triple-scale structure using microscale polymer particles, submicrometer gaps, and nanoscale pores.
  • Characterization of optical properties (reflectance, emissivity) and thermal performance under varying humidity.
  • Evaluation of anticondensation properties (droplet shedding, coverage) and material durability.

Main Results:

  • Achieved 10.9 °C subambient cooling at 40% relative humidity with high sunlight reflectance (0.98) and mid-infrared emissivity (0.91).
  • Demonstrated significant cooling (~4 °C) at 70% relative humidity, outperforming traditional materials.
  • Exhibited robust anticondensation with efficient droplet shedding and reduced coverage due to the triple-scale structure.

Conclusions:

  • The triple-scale structure effectively enhances passive radiative cooling and anticondensation performance.
  • This design shows potential for reliable thermal management in diverse and extreme environments.
  • The material exhibits excellent durability, including self-cleaning, thermal, and UV resistance.