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A hierarchically structured self-cleaning energy-free polymer film for daytime radiative cooling.
- Source :
-
Chemical Engineering Journal . Aug2022:Part 2, Vol. 442, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- [Display omitted] • A hierarchically structured superhydrophobic radiative cooling film was fabricated. • The film integrates solar reflectance, infrared emittance and superhydrophobicity. • The film exhibits an average sub-ambient temperature drop of 12.3 °C under sunlight. • The superhydrophobicity makes the film maintain long-lasting cooling performance. • The film is promising for energy-free cooling materials towards applications. Radiative cooling without using electricity represents an ideal green solution for air-conditioning. Despite exciting progress made so far, most of the radiative cooling materials are vulnerable to outdoor contamination, which leads to decreased performance. Herein, we fabricate a hierarchically structured PVDF/PDMS porous film which integrates strong sunlight reflectance (97%), high thermal-infrared emittance (96%) and robust superhydrophobicity (160.2°). The synergy of the effective solar reflection and thermal-infrared emission enables the film to yield a sub-ambient temperature drop of 12.3 °C under strong sunlight. More importantly, the superhydrophobicity keeps the film away from contamination by self-cleaning, maintaining well the radiative cooling performance for a long-term outdoor use. Additionally, the as-obtained film shows excellent chemical durability after exposure to different pH solutions and UV light irradiation. This work provides a new strategy to integrate self-cleaning with radiative cooling, showing great potential to advance energy-free cooling materials toward real-world applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- *POLYMER films
*COOLING
*AIR conditioning
*ELECTRIC power consumption
*REFLECTANCE
Subjects
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 442
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 156627357
- Full Text :
- https://doi.org/10.1016/j.cej.2022.136239