Abstract
Radiative cooling technologies are being actively researched to achieve a more sustainable society by reducing greenhouse gas emissions due to the lack of energy input. A typical approach to improve radiative cooling performance is to deploy metamaterials as porous polymers with high reflectivity and high long-wave infrared emissivity. There is also a demand for research on coating materials for simple coating processes, but they have not been sufficiently studied as materials for radiative cooling. In this work, a hybrid radiative cooling material was fabricated using polydimethylsiloxane (PDMS) as a binder and mixed with hollow silica (SiO2) spheres. The fabricated hollow particles were compared to commercial hollow particles in film (radius 1.5 cm, thickness 2 mm) form for radiative cooling performance. The average solar reflectivity of the fabricated hollow particle film is 0.90, while the commercial hollow particle is 0.84, which realizes high-performance passive radiative cooling. In addition, the radiative cooling power of 122.66 and 98.89 W·m-2 is achieved under direct sunlight, which is 7.6 ℃ and 3.3 ℃ lower than the ambient temperature. This study finds that the hollow silica film with uniform particles of 3 um size outperforms the commercial hollow silica film in radiative cooling performance and offers the possibility of commercialization due to its light weight and easy fabrication process.
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