Abstract
Ensuring prolonged performance is a challenge in promoting passive daytime radiative cooling materials (PDRCMs) for addressing energy depletion. A single-layer inlay-structured passive daytime radiative cooling composite film (PDRCCF) was introduced with hexagonal boron nitride (h-BN) in polydimethylsiloxane (PDMS) and randomly semi-embedded fluorination-modified barium sulfate (M-BaSO4) particles on the substrate surface. The optimal sample demonstrated high average reflectivity of 94.73% in the solar spectrum (SS), average emissivity of 95.96% in the mid-infrared wavelength range (MIWR) (2.5–25 μm) and average daytime temperature drop of 4.21°C in cloudy weather, and also exhibited super-amphiphobic, friction-resistant and flame-retardant properties due to the h-BN and M-BaSO4 particles. This work offers a significant strategy for advancing PDRCMs.
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