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Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition
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Self-Stratifying Colored Radiative Cooling Paints Through Narrow-Band Color Preservation Scheme.

Dudong Feng1, Andrew S Witty1, Fletcher I Birnbaum1

  • 1School of Mechanical Engineering and the Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA.

Advanced Materials (Deerfield Beach, Fla.)
|August 20, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel self-stratifying paint for colored passive daytime radiative cooling. The paint achieves vibrant colors and efficient cooling, overcoming previous scalability challenges.

Keywords:
color customizationcolored radiative cooling paintcool black paintnarrow‐band absorption dyesself‐stratifying

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermodynamics

Background:

  • Passive daytime radiative cooling (PDRC) offers significant energy-saving potential.
  • Current PDRC technologies often rely on white or reflective surfaces, limiting aesthetic and functional applications.
  • Achieving colored PDRC surfaces faces scalability challenges in processing.

Purpose of the Study:

  • To develop a novel, general, and scalable self-stratifying approach for creating colored radiative cooling paints.
  • To demonstrate the feasibility of producing various colors with efficient cooling performance.
  • To address the trade-off between color and cooling performance in PDRC materials.

Main Methods:

  • A self-stratifying paint formulation utilizing narrow-band absorption dyes.
  • Single-coat application leading to spontaneous formation of an absorption-scattering dual-layer structure.
  • Characterization of optical properties (solar reflectance, emissivity), cooling performance, and mechanical properties (abrasion, adhesion, contact angle).

Main Results:

  • Demonstrated cyan, magenta, and yellow paints achieving 93% solar reflectance and 0.94 sky window emissivity for subambient cooling.
  • Developed a black paint with 46.3% solar reflectance and a 25°C temperature drop.
  • Purple paint showcased color customization within the CMYK space.
  • Mechanical and surface properties matched or exceeded commercial products.

Conclusions:

  • The self-stratifying paint approach enables efficient colored passive daytime radiative cooling with enhanced properties.
  • This method overcomes scalability limitations and offers a pathway for diverse applications.
  • The findings provide insights for developing advanced paints for cooling and water harvesting.