Printable polymer nanocomposites for scalable and architected radiative cooling.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41455699.
- Also identified by DOI 10.1038/s41467-025-67831-0 and PMC identifier 12852863.
- Licence recorded as CC BY-NC-ND.
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Abstract
Space cooling and lighting together consume 25% of global electricity, yet existing daytime radiative coolers are mostly limited to porous planar coatings that block visible light and lack durability. Here, we introduce rheology-optics coupling as a design principle that links polymer viscoelasticity to particle dispersion and optical scattering. Guided by this principle, we develop printable polydimethylsiloxane-zirconium oxide composites that achieve solar reflectance ( ~ 97.3%) and mid-infrared emissivity ( ~ 96.9%) comparable to the best reported values, despite a low filler loading of only ~4.5 vol.%. These scalable coatings provide up to 7.4 <sup>o</sup>C sub-ambient cooling and cut electricity use by 37% versus commercial paint in pilot-scale testing, while withstanding mechanical, thermal, and environmental stresses. Beyond planar coatings, the rheology-tunable polydimethylsiloxane-zirconium oxide ink enables direct ink writing of daylight-regulating architectures that deliver sub-ambient radiative cooling while admitting diffuse daylight for illumination, reducing both cooling and lighting demand. This work provides a practical and versatile platform for radiative cooling.