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Updated: Jun 2, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Published on: July 18, 2015

Spectrally Selective Daytime Radiative Cooling Coating.

Siyuan Jia1, Ronghui Wu2, Syeda Mishal Zahra1

  • 1Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, State Key Laboratory of Mechanics and Control for Aerospace Structures, and Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics, Nanjing, China.

Advanced Materials (Deerfield Beach, Fla.)
|June 1, 2026
PubMed
Summary
This summary is machine-generated.

A novel radiative cooling coating minimizes urban heat by reflecting sunlight and emitting heat within the atmospheric window. This spectrally selective material significantly reduces heat gain in urban environments, offering a sustainable cooling solution.

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Published on: July 2, 2012

Area of Science:

  • Materials Science
  • Sustainable Energy
  • Environmental Engineering

Background:

  • Passive daytime radiative cooling (PDRC) is a promising carbon-free technology for urban heat island mitigation and building energy reduction.
  • Conventional PDRC emitters struggle in urban settings due to parasitic absorption of ambient thermal radiation, limiting their effectiveness.

Purpose of the Study:

  • To develop a scalable, spectrally selective radiative cooling coating that overcomes the urban penalty.
  • To demonstrate enhanced cooling performance in simulated urban environments.

Main Methods:

  • Fabrication of a micro-nano porous poly(vinyl fluoride) (PVF) layer via phase inversion, combined with a silver substrate.
  • Characterization of spectral selectivity, solar reflectance, and mid-infrared emittance within the atmospheric window (8-13 µm).
  • Testing in simulated urban canyon conditions to evaluate cooling performance against broadband emitters.

Main Results:

  • Achieved record spectral selectivity of 1.37.
  • Demonstrated 97.5% solar reflectance and 94.4% mid-infrared emittance confined to the atmospheric window.
  • The selective emitter performed 1.9°C cooler than a broadband emitter in urban canyon simulations, neutralizing heat gain.

Conclusions:

  • The developed spectrally selective coating effectively mitigates urban heat gain, outperforming broadband emitters.
  • The coating exhibits excellent scalability, adhesion, self-cleaning, and durability, making it suitable for practical applications.
  • This technology presents a viable pathway for integrating radiative cooling into sustainable urban development.