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

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.