Passive daytime radiative cooling composite films with super-amphiphobic, friction-resistant and flame-retardant properties

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 h-BN and M−BaSO4 particles. This work offers a significant strategy for advancing PDRCMs.