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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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A solution-processed radiative cooling glass.

Xinpeng Zhao1, Tangyuan Li1, Hua Xie1

  • 1Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.

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|November 9, 2023
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Summary
This summary is machine-generated.

New radiative cooling materials offer significant energy savings for buildings. This innovative "cooling glass" coating provides effective temperature reduction even in humid conditions and harsh environments.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive daytime radiative cooling (PDRC) materials reduce building energy consumption by reflecting sunlight and emitting long-wave infrared (LWIR) radiation.
  • Developing PDRC structures with manufacturing practicality, applicability, and long-term environmental stability remains a challenge.

Purpose of the Study:

  • To develop a novel passive cooling material with enhanced performance and durability.
  • To address the limitations of existing PDRC technologies.

Main Methods:

  • Fabrication of a randomized photonic composite using a microporous glass framework and aluminum oxide particles.
  • Characterization of the material's optical properties (solar reflectance and LWIR emissivity).
  • Testing of the material's cooling performance under various environmental conditions, including high humidity, water exposure, UV radiation, soiling, and high temperatures.

Main Results:

  • The developed microporous glass coating exhibits selective LWIR emission and high solar reflectance.
  • Achieved a temperature drop of approximately 3.5°C during midday and 4°C during nighttime, even under 80% humidity.
  • The radiative cooling glass coating demonstrated sustained high solar reflectance after exposure to harsh conditions.

Conclusions:

  • The novel microporous glass composite is a practical and stable solution for passive daytime radiative cooling.
  • This technology offers a promising pathway to significantly reduce building cooling energy demands.
  • The material's resilience to environmental factors ensures long-term effectiveness for sustainable cooling applications.