Sustainable and self-cleaning bilayer coatings for high-efficiency daytime radiative cooling

Abstract

Passive daytime radiative cooling (PDRC) without additional energy input to cool objects by directly radiating energy into outer space and reflecting sunlight provides a promising pathway to replace current compression-based...

Superhydrophobic Designs for Durable Radiative Cooling

“…(G) Schematic showing the preparation process and SEM images of the bilayer porous coating. Reproduced with permission from ref . Copyright 2022 Royal Society of Chemistry.…”

“…The purpose of this separation is to enable superhydrophobicity, while ensuring that the radiative cooling function remains unaffected. Chen et al developed a bilayer PDMS coating to achieve long-term outdoor cooling (Figure G) . This coating is produced by using an optimized sodium chloride (NaCl) sacrificial template, which is ready for scalable production and can be easily recycled.…”

“…Chen et al developed a bilayer PDMS coating to achieve long-term outdoor cooling (Figure 3G). 15 This coating is produced by using an optimized sodium chloride (NaCl) sacrificial template, which is ready for scalable production and can be easily recycled. In this regard, the upper microporous layer is designed to achieve superhydrophobicity, while the lower nanoporous layer is responsible for high solar reflectivity.…”

Oil-paper-umbrella-inspired passive radiative cooling using recycled packaging foam

“…1,2 Passive daytime radiative cooling (PDRC) is a promising future technology for building cooling and renewable energy harvesting, which can realize subambient cooling performance under direct sunlight by simultaneously reecting sunlight (0.3-2.5 mm) and emitting infrared thermal radiation to the cold outer space (∼3 K) 3 through the mid-infrared (MIR) atmospheric transparent window (8-13 mm). [4][5][6][7][8][9] Recently, researchers have successfully designed numerous PDRC materials and structures with both high solar reectance R solar and high infrared thermal emissivity 3 IR through the atmospheric window, such as photonic structures, 10-14 metamaterials, [15][16][17] nanoparticles, 10,[18][19][20][21][22] porous structures, [23][24][25][26] and bio-inspired materials. [27][28][29] Although these PDRC structures have good radiative cooling performance, their designs and approaches are either complicated or expensive, which makes them unsuitable for widespread eld applications in infrastructure.…”

Self-cleaning and fully polymer-based super-moisture-resistant gas barrier coating films with 2D polymers for flexible electronic devices and packaging applications

“…Introducing self-cleaning and self-healing properties to next-generation GDBFs can be very useful in the packaging of optoelectronic devices (such as OLEDs and solar cells), as these functionalities will assist efficient device performance under diverse environmental conditions. 48 Water or solvent droplets tend to roll off the self-cleaning coating film, so dust and dirt particles can be easily removed from self-cleaning surfaces. 49 Self-healing materials can heal and protect the film surfaces from mechanical damage, such as cuts, tears, or scratches.…”