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21 August 2020 Scalable radiative cooling paints based on random porous polymers
Yuan Yang
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Proceedings Volume 11467, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVII; 114670B (2020) https://doi.org/10.1117/12.2566304
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
Radiative cooling is an emerging strategy to achieve cooling without using electricity, where a surface has high solar reflectance and high thermal emittance simultaneously. Porous polymer paint is a scalable approach to realize radiative cooling. For instance, porous poly(vinylidene fluoride-co-hexafluoropropene) (P(VdF-HFP)) coatings exhibit near-perfect solar reflectance Rsolar (> 0.96) and long-wave infrared (LWIR) emittance εLWIR (~ 0.97) for radiative cooling. In this presentation, I will discuss the principle, manufacturing of such porous film. Methods to switch the optical/thermal properties from radiative cooling to solar absorption will also be discussed, which represents an “ice-house” to “green-house” transition useful for tuneable radiative cooling at night and potentially, thermal camouflaging. At the end, strategies to achieve colored radiative cooling will be discussed too
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Yuan Yang "Scalable radiative cooling paints based on random porous polymers", Proc. SPIE 11467, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVII, 114670B (21 August 2020); https://doi.org/10.1117/12.2566304
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KEYWORDS
Polymers
Long wavelength infrared
Optical coatings
Reflectivity
Thermography
Absorption
Infrared radiation
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