TY - JOUR
T1 - Porous Polymers with Switchable Optical Transmittance for Optical and Thermal Regulation
AU - Mandal, Jyotirmoy
AU - Jia, Mingxin
AU - Overvig, Adam
AU - Fu, Yanke
AU - Che, Eric
AU - Yu, Nanfang
AU - Yang, Yuan
N1 - Publisher Copyright:
© 2019 Elsevier Inc.
PY - 2019/12/18
Y1 - 2019/12/18
N2 - 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°C) and above-ambient solar heating (by 21.4°C), color-neutral daylighting, and thermal camouflage are demonstrated.
AB - 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°C) and above-ambient solar heating (by 21.4°C), color-neutral daylighting, and thermal camouflage are demonstrated.
KW - daylighting
KW - infrared
KW - optical modulation
KW - optical switching
KW - porous polymers
KW - radiative cooling
KW - solar
KW - solar heating
KW - thermoregulation
KW - transmittance switching
UR - http://www.scopus.com/inward/record.url?scp=85073953057&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073953057&partnerID=8YFLogxK
U2 - 10.1016/j.joule.2019.09.016
DO - 10.1016/j.joule.2019.09.016
M3 - Article
AN - SCOPUS:85073953057
VL - 3
SP - 3088
EP - 3099
JO - Joule
JF - Joule
IS - 12
ER -