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Efficient Thin Polymer Coating as a Selective Thermal Emitter for Passive Daytime Radiative Cooling.

Udayan Banik1, Ashutosh Agrawal1, Hosni Meddeb1

  • 1DLR Institute of Networked Energy Systems, 26129 Oldenburg, Germany.

ACS Applied Materials & Interfaces
|May 11, 2021
PubMed
Summary

Researchers developed a simple polysilazane polymer emitter for efficient passive daytime radiative cooling. This novel material achieves significant subambient temperatures under sunlight by selectively emitting heat.

Keywords:
organopolysilazanepolymer-derived coatingsilicon oxycarbonitride emittersubambient radiative coolerthin photonic emitter

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermodynamics

Background:

  • Passive daytime radiative cooling (PDRC) offers a sustainable method for subambient temperature control.
  • Current PDRC technologies often rely on complex and costly nanoengineered structures.
  • Spectral selectivity in the 8-13 μm atmospheric transparency window is crucial for efficient radiative cooling.

Purpose of the Study:

  • To demonstrate a simple, cost-effective, and highly selective radiative cooling emitter.
  • To investigate the potential of polysilazane-derived materials for PDRC applications.
  • To achieve significant subambient cooling under direct sunlight using a planar polymer structure.

Main Methods:

  • Fabrication of a thin (5 μm) polysilazane-derived silicon oxycarbonitride coating via dip-coating.
  • Characterization of the spectral emissivity of the coating, particularly within the 8-13 μm window.
  • Integration of the coating with a silver mirror to enhance solar reflectance.
  • Experimental measurement of temperature reduction and cooling power under direct sunlight.

Main Results:

  • The polysilazane coating exhibited a high emissivity of 0.86 in the 8-13 μm atmospheric transparency window.
  • The structure suppressed atmospheric heat absorption due to low emissivity outside the target spectral range.
  • The complete structure reflected 97% of incoming solar irradiation.
  • A temperature reduction of 6.8 °C below ambient temperature was achieved, with a cooling power of 93.7 W m-2.

Conclusions:

  • Polysilazane-derived materials offer a simple and effective solution for passive daytime radiative cooling.
  • The demonstrated planar polymer emitter exhibits high spectral selectivity and durability.
  • This approach presents a promising pathway for scalable and efficient radiative cooling technologies.