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Title: Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

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 emittances (0.97 ± 0.02) allow for subambient temperature drops of ~6°C and cooling powers of ~96 watts per square meter (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, and the technique offers a paint-like simplicity.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [2] ;  [2] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Columbia Univ., New York, NY (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
BNL-209460-2018-JAAM
Journal ID: ISSN 0036-8075
Grant/Contract Number:
SC0012704; AC02-06CH11357
Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 362; Journal Issue: 6412; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1478138
Alternate Identifier(s):
OSTI ID: 1482561

Mandal, Jyotirmoy, Fu, Yanke, Overvig, Adam C., Jia, Mingxin, Sun, Kerui, Shi, Norman N., Zhou, Hua, Xiao, Xianghui, Yu, Nanfang, and Yang, Yuan. Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling. United States: N. p., Web. doi:10.1126/science.aat9513.
Mandal, Jyotirmoy, Fu, Yanke, Overvig, Adam C., Jia, Mingxin, Sun, Kerui, Shi, Norman N., Zhou, Hua, Xiao, Xianghui, Yu, Nanfang, & Yang, Yuan. Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling. United States. doi:10.1126/science.aat9513.
Mandal, Jyotirmoy, Fu, Yanke, Overvig, Adam C., Jia, Mingxin, Sun, Kerui, Shi, Norman N., Zhou, Hua, Xiao, Xianghui, Yu, Nanfang, and Yang, Yuan. 2018. "Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling". United States. doi:10.1126/science.aat9513.
@article{osti_1478138,
title = {Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling},
author = {Mandal, Jyotirmoy and Fu, Yanke and Overvig, Adam C. and Jia, Mingxin and Sun, Kerui and Shi, Norman N. and Zhou, Hua and Xiao, Xianghui and Yu, Nanfang and Yang, Yuan},
abstractNote = {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 emittances (0.97 ± 0.02) allow for subambient temperature drops of ~6°C and cooling powers of ~96 watts per square meter (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, and the technique offers a paint-like simplicity.},
doi = {10.1126/science.aat9513},
journal = {Science},
number = 6412,
volume = 362,
place = {United States},
year = {2018},
month = {10}
}

Works referenced in this record:

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journal, November 2014
  • Raman, Aaswath P.; Anoma, Marc Abou; Zhu, Linxiao
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Radiative Heat Pumping from the Earth Using Surface Phonon Resonant Nanoparticles
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