Radiative cooling film enabled by droplet-like infrared hot spots via low-cost and scalable spray-coating process for tropical regions
Issued Date
2024-01-01
Resource Type
eISSN
26663864
Scopus ID
2-s2.0-85189360022
Journal Title
Cell Reports Physical Science
Rights Holder(s)
SCOPUS
Bibliographic Citation
Cell Reports Physical Science (2024)
Suggested Citation
Sakata P., Muangnapoh K., Rueangsawang W., Ponghiransmith C., Pornmanat C., Phuphathanaphong N., Mangthong P., Kaewkhao J., Suttiruengwong S., Kanjanaboos P. Radiative cooling film enabled by droplet-like infrared hot spots via low-cost and scalable spray-coating process for tropical regions. Cell Reports Physical Science (2024). doi:10.1016/j.xcrp.2024.101899 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/97917
Title
Radiative cooling film enabled by droplet-like infrared hot spots via low-cost and scalable spray-coating process for tropical regions
Corresponding Author(s)
Other Contributor(s)
Abstract
Radiative cooling is a passive cooling process to reduce temperature by emitting infrared radiation in the atmospheric window range of 8–13 μm. In this work, droplets and wrinkles, which can induce Mie scattering and therefore increase emissivity, are generated via low-cost and scalable spray coating to enable economical radiative cooling production (∼$0.05/m2). Tested during the daytime with ∼920 W m−2 and ∼58% relative humidity in Thailand, the double layer consisting of droplets on top of a polydimethylsiloxane flat film can lead to a temperature reduction of 1.22°C and 3.61°C below the baseline temperature (without the coating) under an airflow test box and a closed test box, respectively. Furthermore, cooling stability and applicability on functional substrates such as glass, wood, and roof tiles are investigated. To demonstrate scalability, a commercial spray gun is used as an all-in-one technique for fabrication, achieving a similar temperature reduction and opening doors for commercialization.