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<p>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.</p>

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Printable polymer nanocomposites for scalable and architected radiative cooling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月27日

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  • Kai Zhou,
  • Songtao Tang,
  • Pranto Karua,
  • Fukang Wu,
  • Sungmin Hong,
  • Diya Patel,
  • Gwendolyn M. Reeser,
  • Donald M. Cropek,
  • Paul V. Braun,
  • Lili Cai

摘要

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 oC 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.