posted on 2023-11-30, 15:20authored byJianlin Zhou, Canxia Ding, Xuehui Zhang, Donglei Li, Dicong Yang, Bo You, Limin Wu
Radiative cooling, achieved by selectively
emitting thermal
radiation
to outer space, holds great promise for addressing global energy challenges
and mitigating the effects of climate change. However, most radiative
cooling materials face limitations in effectively cooling in high-heat
environments, and their performance deteriorates significantly with
prolonged outdoor use. These shortcomings restrict their widespread
application in various settings. To address this, we draw inspiration
from the unique biostructure of dictyophora and propose a novel hollow@porous
radiative cooling film by integrating hollow microparticles and porous
polymer. The fabricated hollow@porous flexible film exhibits high
sunlight reflection (93.7%), strong infrared emissivity (89.1%), as
well as ultralow thermal conductivity (17.56 mW/m k). The daytime
cooling performance of the prepared cooler is experimentally demonstrated
with a marked temperature decrease to 17.4 °C under a peak solar
intensity of 980 W/m2. Furthermore, the unique hollow@porous
structure also strengthens the film’s long-term durability
by incorporating weather resistance and self-cleaning properties,
which ensures stable and efficient radiative cooling performance even
in harsh climatic conditions. This advancement in radiative cooling
materials opens up new possibilities for thermal management, energy
conservation, and cooling of solar panels, engine components, electronic
equipment, new energy batteries, etc.