Passive
radiative cooling is a spontaneous pattern of reflecting
sunlight and radiating heat into the cold outer space through transparent
atmosphere windows. In this work, an ordered-porous-array polymethyl
methacrylate (OPA-PMMA) film with the properties of excellent radiative
cooling is designed and studied. An ultra-high emissivity of 98.4%
in the mid-infrared region (3–25 μm) and a good solar
reflectance of 85% in the ultraviolet and near-infrared solar spectra
(0.2–2.5 μm) were achieved. The surface temperature of
the OPA-PMMA film is 16 °C lower than that of the smooth-surface
PMMA films and is 8.6 °C lower than that of the commercial white
paint in the outdoor test. The structure of the OPA plays an important
role in improving solar reflectivity and emissivity. The films are
fabricated using a one-step low-cost process that can be applied for
large-scale production. It is vital for promoting radiative cooling
as a viable energy technology for buildings, fabric, or equipment
that need a cooling environment.
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