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Designing Nanoporous Polymer Films for High-Performance Passive Daytime Radiative Cooling
Liao Huang1, Yaoxin Hu1, Xupei Yao2
1Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia.
ACS Applied Materials & Interfaces
|September 6, 2024
Summary
Researchers developed a novel nanoporous polymer coating for energy-free passive daytime radiative cooling (PDRC). This material achieves significant subambient cooling by optimizing pore size and porosity for enhanced solar reflectance and infrared emission.
Area of Science:
- Materials Science
- Nanotechnology
- Sustainable Energy
Background:
- Passive daytime radiative cooling (PDRC) offers a sustainable solution to building energy demands and global warming.
- Spectrally selective porous polymers are promising for PDRC due to their cooling potential and scalability.
- Controlling nanopore uniformity and morphology is critical for optimizing PDRC material performance.
Purpose of the Study:
- To develop a high-performance PDRC material with uniform nanopores.
- To investigate the relationship between pore properties and radiative cooling performance.
- To demonstrate a scalable strategy for creating advanced PDRC coatings.
Main Methods:
- Utilized metal-organic framework (MOF) nanocrystals as sacrificial templates.
- Fabricated nanoporous poly(vinylidene fluoride) (PVDF) coating films.
- Characterized pore size, porosity, solar reflectance, and infrared emissivity.
Main Results:
- Achieved uniform nanopores (approx. 400 nm) and 37% porosity in PVDF films.
- Demonstrated high solar reflectance (94.9%) and long-wave infrared emission (92.8%).
- Obtained subambient cooling of ~9.5 °C with a net cooling power of 137 W/m².
Conclusions:
- The MOF-templated strategy effectively creates high-performance PDRC materials.
- Optimized nanoporous structures significantly enhance radiative cooling efficiency.
- This approach offers a new pathway for developing advanced materials for PDRC applications.
