Superhydrophobic, Superoleophobic, Robust and Sprayable Radiative Cooling Nanocomposites via Multifluorination and Multilevel Interfacial Regulation Strategy

Abstract Radiative Cooling technology has garnered significant interest owing to its passive cooling capability without energy consumption. However, for long‐term outdoor applications, achieving simultaneous superhydrophobicity, superoleophobicity, excellent thermomechanical properties, robustness, and sprayability remains a significant challenge. This work introduces a multifluorination and multilevel interfacial regulation strategy for fabricating epoxy‐based radiative cooling nanocomposites that exhibit exceptional performance across these critical aspects. In this strategy, tetrafluorophenyl epoxy resin (FEP) exhibits excellent infrared emissivity in the atmospheric window. Hollow halloysite nanotubes (hNTs) and silica are functionalized with perfluorinated and alkylated segments (FhNTs and FSiO₂), creating zero‐1D nanofillers with multilevel interfaces to enhance solar reflectivity. The resulting FhNTs₄₀/(FSiO₂)₁₀ composite exhibits excellent atmospheric window emissivity (97.53%) and solar reflectivity (96.7%), achieving 12.8 °C of daytime cooling and 1.77 °C of night cooling. Moreover, the fluorinated matrix and nanofillers endow the coating with stable superhydrophobicity, oleophobicity, and self‐cleaning properties, even after rigorous physical and chemical durability tests.