Banik, Udayan and Agrawal, Ashutosh and Meddeb, Hosni and Sergeev, Oleg and Reininghaus, Nies and Götz-Köhler, Maximilian and Gehrke, Kai and Stührenberg, Jonas and Sznajder, Maciej and Agert, Carsten (2021) Efficient Thin Polymer Coating as a Selective Thermal Emitter for Passive Daytime Radiative Cooling. ACS Applied Materials and Interfaces. American Chemical society (ACS). doi: 10.1021/acsami.0c21204. ISSN 1944-8244.
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Official URL: https://pubs.acs.org/doi/abs/10.1021/acsami.1c04056
Abstract
Radiative cooling to subambient temperatures can be efficiently achieved through spectrally selective emission, which until now has only been realized by using complex nanoengineered structures. Here, a simple dip-coated planar polymer emitter derived from polysilazane, which exhibits strong selective emissivity in the atmospheric transparency window of 8–13 μm, is demonstrated. The 5 μm thin silicon oxycarbonitride coating has an emissivity of 0.86 in this spectral range because of alignment of the frequencies of bond vibrations arising from the polymer. Furthermore, atmospheric heat absorption is suppressed due to its low emissivity outside the atmospheric transparency window. The reported structure with the highly transparent polymer and underlying silver mirror reflects 97% of the incoming solar irradiation. A temperature reduction of 6.8 °C below ambient temperature was achieved by the structure under direct sunlight, yielding a cooling power of 93.7 W m–2. The structural simplicity, durability, easy applicability, and high selectivity make polysilazane a unique emitter for efficient prospective passive daytime radiative cooling structures.
Item URL in elib: | https://elib.dlr.de/142271/ | |||||||||||||||||||||||||||||||||
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Document Type: | Article | |||||||||||||||||||||||||||||||||
Title: | Efficient Thin Polymer Coating as a Selective Thermal Emitter for Passive Daytime Radiative Cooling | |||||||||||||||||||||||||||||||||
Authors: |
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Date: | 11 May 2021 | |||||||||||||||||||||||||||||||||
Journal or Publication Title: | ACS Applied Materials and Interfaces | |||||||||||||||||||||||||||||||||
Refereed publication: | Yes | |||||||||||||||||||||||||||||||||
Open Access: | Yes | |||||||||||||||||||||||||||||||||
Gold Open Access: | No | |||||||||||||||||||||||||||||||||
In SCOPUS: | Yes | |||||||||||||||||||||||||||||||||
In ISI Web of Science: | Yes | |||||||||||||||||||||||||||||||||
DOI: | 10.1021/acsami.0c21204 | |||||||||||||||||||||||||||||||||
Publisher: | American Chemical society (ACS) | |||||||||||||||||||||||||||||||||
ISSN: | 1944-8244 | |||||||||||||||||||||||||||||||||
Status: | Published | |||||||||||||||||||||||||||||||||
Keywords: | sub ambient radiative cooler, organopolysilazane, polymer derived coating, thin photonic emitter, silicon oxycarbonitride emitter | |||||||||||||||||||||||||||||||||
HGF - Research field: | Energy | |||||||||||||||||||||||||||||||||
HGF - Program: | Energy System Design | |||||||||||||||||||||||||||||||||
HGF - Program Themes: | Digitalization and System Technology | |||||||||||||||||||||||||||||||||
DLR - Research area: | Energy | |||||||||||||||||||||||||||||||||
DLR - Program: | E SY - Energy System Technology and Analysis | |||||||||||||||||||||||||||||||||
DLR - Research theme (Project): | E - Energy System Technology | |||||||||||||||||||||||||||||||||
Location: | Oldenburg | |||||||||||||||||||||||||||||||||
Institutes and Institutions: | Institute of Networked Energy Systems > Urban and Residential Technologies Institute of Networked Energy Systems > Energy Systems Analysis, OL Institute of Space Systems > Mechanic and Thermal Systems | |||||||||||||||||||||||||||||||||
Deposited By: | Banik, Udayan | |||||||||||||||||||||||||||||||||
Deposited On: | 25 May 2021 14:43 | |||||||||||||||||||||||||||||||||
Last Modified: | 01 Aug 2022 03:00 |
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