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      Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

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          Abstract

          Passive daytime radiative cooling (PDRC) involves spontaneously cooling a surface by reflecting sunlight and radiating heat to the cold outer space. Current PDRC designs are promising alternatives to electrical cooling, but are either inefficient or have limited applicability. We present a simple, inexpensive and scalable phase-inversion-based method for fabricating hierarchically porous poly(vinylidene fluoride-co-hexafluoropropene) (P(VdF-HFP)HP) coatings with excellent PDRC capability. High, substrate-independent hemispherical solar reflectances (0.96 ± 0.03) and long-wave infrared (LWIR) emittances (0.97 ± 0.02) allow for sub-ambient temperature drops of ~6°C and cooling powers of ~96 W m–2 under solar intensities of 890 and 750 W m–2 respectively. The performance equals or surpasses those of state-of-the-art PDRC designs, while the technique offers a paint-like simplicity.

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          Author and article information

          Journal
          Science
          Science
          American Association for the Advancement of Science (AAAS)
          0036-8075
          1095-9203
          September 27 2018
          : eaat9513
          Article
          10.1126/science.aat9513
          30262632
          6e6a1f63-047b-4916-923d-44b403d0690d
          © 2018
          History

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