Journal
JOULE
Volume 3, Issue 12, Pages 3088-3099Publisher
CELL PRESS
DOI: 10.1016/j.joule.2019.09.016
Keywords
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Funding
- Columbia University
- AFOSR [FA9550-18-1-0410]
- AFOSR MURI (Multidisciplinary University Research Initiative) program [FA9550-14-1-0389]
- AFOSR DURIP (Defense University Research Instrumentation Program) [FA9550-16-1-0322]
- National Science Foundation [ECCS-1307948]
- Schmidt Science Fellows Program
- Rhodes Trust
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Adaptive control of broadband light is essential for diverse applications including building energy management and light modulation. Here, we present porous polymer coatings (PPCs), whose optical transmittance changes upon reversible wetting with common liquids, as a platform for optical management from solar to thermal wavelengths. In the solar wavelengths, reduction in optical scattering upon wetting changes PPCs from reflective to transparent. For poly(vinylidene fluoride-co-hexafluoropropene) PPCs, this corresponds to solar and visible transmittance changes of up to 0.74 and 0.80, respectively. For infrared (IR) transparent polyethylene PPCs, wetting causes an icehouse-to-greenhouse transition where solar transparency rises but thermal IR transparency falls. These performances are either unprecedented or rival or surpass those of notable optical switching (e.g., electrochromic and thermochromic) paradigms, making PPCs promising for large-scale optical and thermal management. Specifically, switchable sub-ambient radiative cooling (by 3.2 degrees C) and above-ambient solar heating (by 21.4 degrees C), color-neutral daylighting, and thermal camouflage are demonstrated.
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