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Procedure for the Transfer of Polymer Films Onto Porous Substrates with Minimized Defects

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Published on: June 22, 2019

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

This summary is machine-generated.

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.

Keywords:

daytime radiative cooling high emittance high solar reflectance nanoporous polymer film

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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.