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Radiative cooling is a passive cooling technology that offers great promisesto reduce space cooling cost, combat the urban island effect and alleviate theglobal warming. To achieve passive daytime radiative cooling, currentstate-of-the-art solutions often utilize complicated multilayer structures or areflective metal layer, limiting their applications in many fields. Attemptshave been made to achieve passive daytime radiative cooling with single-layerpaints, but they often require a thick coating or show partial daytime cooling.In this work, we experimentally demonstrate remarkable full daytime sub-ambientcooling performance with both BaSO4 nanoparticle films and BaSO4 nanocompositepaints. BaSO4 has a high electron bandgap for low solar absorptance and phononresonance at 9 um for high sky window emissivity. With an appropriate particlesize and a broad particle size distribution, BaSO4 nanoparticle film reaches anultra-high solar reflectance of 97.6% and high sky window emissivity of 0.96.During field tests, BaSO4 film stays more than 4.5C below ambient temperatureor achieves average cooling power of 117 W/m2. BaSO4-acrylic paint is developedwith 60% volume concentration to enhance the reliability in outdoorapplications, achieving solar reflectance of 98.1% and sky window emissivity of0.95. Field tests indicate similar cooling performance to the BaSO4 films.Overall, our BaSO4-acrylic paint shows standard figure of merit of 0.77 whichis among the highest of radiative cooling solutions, while providing greatreliability, the convenient paint form, ease of use and the compatibility withcommercial paint fabrication process.

Remarkable Daytime Sub-ambient Radiative Cooling in BaSO4 Nanoparticle Films and Paints