Park, Hyunho Joo, Beom Soo Kang, Gumin Ko, Hyungduk Kim, Jin Hong 2025-01-23T07:30:33Z 2025-01-23T07:30:33Z 2025-01-23 2025-02 2050-7488 https://pubs.kist.re.kr/handle/201004/151654 Passive daytime radiative cooling (PDRC) offers a sustainable cooling strategy by reflecting sunlight and emitting thermal radiation through the atmospheric window. However, conventional polymers used in PDRC composites often exhibit suboptimal optical properties due to detrimental chemical bonds like C？H and C[double bond, length as m-dash]O. Herein, theoretical and experimental comparative analyses are performed, demonstrating that an amorphous perfluoropolymer (CYTOP) composed solely of C？F and C？O？C bonds can enhance the cooling performance compared to conventional PDRC polymers. Leveraging the chemically near-ideal properties of CYTOP, a nanovoid-Al2O3 dual-scatter PDRC paint has been developed, achieving an outstanding solar reflectance of 98.2% and an infrared emittance of 96.4% at 80 μm thickness. This results in surface temperatures 5.4 °C below ambient and internal space temperatures in mini buildings, approximately 5 °C lower than those with commercial paints. This work offers strategic insights into materials and nanostructure design for efficient subambient radiative cooling applications. English Royal Society of Chemistry A hierarchically engineered polymer composite with a dual-scatter structure for enhanced passive radiative cooling Article 10.1039/d4ta07793h 1 Journal of Materials Chemistry A, v.13, no.7, pp.4870 - 4880 Journal of Materials Chemistry A 13 7 4870 4880 N scie scopus 001396868700001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article PAINTS FILMS PHOTONIC STRUCTURES MORPHOLOGY