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Flexible Janus Patch with Reversible Adhesion, Self-Cleaning, and Enhanced Solar Reflection for Deployable Radiative

Sangah Park1, Junyong Park1

  • 1School of Materials Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 39177, Republic of Korea.

ACS Nano
|February 20, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a flexible, patchable radiative cooling platform. This innovative material offers sustainable cooling by reflecting sunlight and releasing heat, reducing indoor temperatures by up to 8.5 °C.

Keywords:
Janus microstructurebiomimeticsdry adhesionpatchradiative cooling

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Area of Science:

  • Materials Science
  • Sustainable Energy
  • Nanotechnology

Background:

  • Passive daytime radiative cooling (PDRC) offers sustainable energy reduction by reflecting solar radiation and dissipating heat.
  • Existing polymer films face challenges in installation, durability, and seasonal adaptability.

Purpose of the Study:

  • To develop a flexible and patchable PDRC platform overcoming limitations of current technologies.
  • To enhance PDRC performance through biomimetic Janus microstructures and improved material properties.

Main Methods:

  • Fabrication of a monolithic silicone elastomer patch with bifacially engineered surfaces.
  • Integration of reversible self-adhesion via micropillars and self-cleaning capabilities.
  • Creation of a hierarchically porous structure with oxide nanoparticles for maximized solar reflection.

Main Results:

  • The patch demonstrated reversible dry adhesion strength of ~3 N cm⁻² over 40 cycles.
  • The platform exhibited self-cleaning properties, resisting surface fouling.
  • Outdoor experiments showed a maximum indoor temperature reduction of 8.5 °C under direct sunlight.

Conclusions:

  • The developed platform is versatile, reusable, and seasonally adaptive for high-performance radiative cooling.
  • This technology shows significant potential for real-world implementation in sustainable cooling solutions.