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Photonic Inverse Opal-Enabled Seamless Interface of Bilayer Structure for Color Regulation and Robust Passive

Jia-Bin Wei1, Bo Tang1, Xin-Jun Li1

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Advanced Materials (Deerfield Beach, Fla.)
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Summary

New colorful cooling materials offer efficient, durable, and aesthetically pleasing zero-energy cooling. This technology integrates passive daytime radiative cooling (PDRC) with structural coloration for broad applications.

Keywords:
inverse opal structureradiative coolingsize‐exclusionstructural color

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Science

Background:

  • Passive daytime radiative cooling (PDRC) is a promising zero-energy cooling technology, but challenges remain in achieving both high cooling efficiency and mechanical robustness.
  • Existing PDRC materials often suffer from limited spectral selectivity, narrow bandwidth, or structural instability.

Purpose of the Study:

  • To develop structurally colored daytime radiative cooling (SCDRC) sheets with enhanced cooling efficiency, durability, and aesthetic appeal.
  • To overcome limitations of monolayer photonic structures and multilayer architectures in PDRC applications.

Main Methods:

  • A size-exclusion-assisted selective infiltration strategy was employed to fabricate SCDRC sheets.
  • A polymer with low solar absorption and high infrared emissivity was infiltrated into colloidal crystal templates, forming an inverse opal layer.
  • Microscale boron nitride platelets were used to create a packed solar-reflective microstructure, achieving selective exclusion from the template.

Main Results:

  • The fabricated SCDRC sheets exhibited tunable colors via pore geometry control.
  • Achieved >96% solar reflectance and >94% mid-infrared emissivity.
  • Demonstrated a 7°C sub-ambient temperature reduction outdoors and a 20.7% average cooling power reduction across diverse climates.
  • The photonic framework showed exceptional stability under prolonged thermal and humidity exposure.

Conclusions:

  • The seamless-interface bilayer fabrication strategy enables the development of durable colored cooling materials.
  • The SCDRC sheets integrate aesthetic appeal with energy-saving functionality.
  • This technology holds significant potential for architectural and industrial applications requiring advanced cooling solutions.