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Transparent Wood for Passive Radiative Cooling of Solar Absorbers.

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Transparent wood biocomposite coatings offer sustainable passive radiative cooling. These eco-friendly materials effectively reduce temperatures under sunlight by emitting heat, showcasing potential for solar cell and structural applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive radiative cooling utilizes Earth's atmospheric transparency window for sustainable heat emission.
  • Reducing energy consumption for cooling is crucial for environmental sustainability.
  • Developing advanced materials for efficient radiative cooling is an active research area.

Purpose of the Study:

  • To develop transparent, wood-based biocomposite coatings for passive radiative cooling.
  • To investigate the optical and thermal radiative properties of these novel coatings.
  • To assess the cooling performance of the coatings under direct sunlight.

Main Methods:

  • Fabrication of freestanding, micron-thick wood-based biocomposite coatings.
  • Functionalization of wood scaffolds with zinc oxide (ZnO) nanoparticles.
  • In situ thiol-ene polymerization for enhanced transparency and mechanical properties.
  • Measurement of visible transparency and mid-infrared emissivity.
  • Evaluation of substrate temperature reduction under direct sunlight.

Main Results:

  • The biocomposite coatings achieved high visible transparency.
  • Exceptional mid-infrared emissivity (around 0.95) was observed.
  • ZnO-functionalized coatings reduced substrate temperatures by approximately 6-7 °C under direct sunlight.
  • Enhanced thermal radiation was identified as the primary cooling mechanism.
  • Improved mechanical properties were achieved through thiol-ene polymerization.

Conclusions:

  • Transparent wood-based biocomposite coatings are a viable eco-friendly solution for passive radiative cooling.
  • These materials demonstrate significant potential for mitigating overheating in solar cells and other sunlight-exposed structures.
  • The developed biocomposites offer a cost-effective, bio-based alternative to conventional cooling technologies with versatile applications.