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Related Experiment Video

Updated: Jul 14, 2025

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method
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Bioinspired Switchable Passive Daytime Radiative Cooling Coatings.

Tiancheng Wang1, Yuzhe Xiao2,3, Jonathan L King2

  • 1Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

ACS Applied Materials & Interfaces
|October 9, 2023
PubMed
Summary

Researchers developed a novel bioinspired coating for passive daytime radiative cooling (PDRC). This thin, robust material mimics nature to reflect sunlight and emit heat, offering an eco-friendly alternative to air conditioning.

Keywords:
bijelsdisordered structureporous materialsspinodal decomposition

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive daytime radiative cooling (PDRC) offers an eco-friendly alternative to traditional electrical air conditioning (AC).
  • Optimizing PDRC coatings requires balancing multiple performance aspects for practical application.
  • Nature provides bio-inspired models for advanced material functionalities.

Purpose of the Study:

  • To develop a high-performance PDRC coating inspired by natural structures.
  • To achieve excellent solar reflectance, LWIR emissivity, and mechanical robustness in a thin coating.
  • To demonstrate the potential of bioinspired designs for scalable and tunable cooling solutions.

Main Methods:

  • Fabrication of a PDRC coating using bicontinuous interfacially jammed emulsion gels (bijels) as a template.
  • Characterization of the coating's optical properties (solar reflectance and LWIR emissivity).
  • Evaluation of the coating's thermal performance under direct sunlight and assessment of its mechanical properties.

Main Results:

  • The bioinspired bijel PDRC coating achieved high solar reflectance (≳0.97) and LWIR emissivity (≳0.93).
  • A thin coating (130 μm) demonstrated a significant subambient temperature drop of ~5.6 °C under direct sunlight.
  • The PDRC coating exhibited switchable cooling capabilities and mechanical robustness, inspired by beetle exoskeletons and spongy bone.

Conclusions:

  • Bioinspired PDRC coatings based on bijels offer a promising, high-performance solution for sustainable cooling.
  • The developed material demonstrates excellent optical and thermal properties, along with desirable mechanical characteristics.
  • This approach highlights the potential of biomimicry for creating advanced, scalable radiative cooling technologies.