ID | 60714 |
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著者 |
Suichi, Takahiro
Department of Electrical and Electronic Engineering, Okayama University
Ishikawa, Atsushi
Department of Electrical and Electronic Engineering, Okayama University
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Tanaka, Takuo
Metamaterials Laboratory, RIKEN Cluster for Pioneering Research
Hayashi, Yasuhiko
Department of Electrical and Electronic Engineering, Okayama University
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Tsuruta, Kenji
Department of Electrical and Electronic Engineering, Okayama University
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抄録 | Daytime radiative cooling offers efficient passive cooling of objects by tailoring their spectral responses, holding great promise for green photonics applications. A specular reflector has been utilized in cooling devices to minimize sunlight absorption, but such a glaring surface is visually less appealing, thus undesirable for public use. Here, by exploiting strong diffuse reflection of silica nanoshells in a polymer matrix, daytime radiative cooling below the ambient temperature is experimentally demonstrated, while showing whitish color under sunlight. The cooling device consists of a poly(methyl methacrylate) layer with randomly distributed silica nanoshells and a polydimethylsiloxane (PDMS) layer on an Ag mirror. The non-resonant nanoshells exhibit uniform diffuse reflection over the solar spectrum, while fully transparent for a selective thermal radiation from the underneath PDMS layer. In the temperature measurement under the sunlight irradiation, the device shows 2.3 degrees C cooler than the ambient, which is comparable to or even better than the conventional device without the nanoshells. Our approach provides a simple yet powerful nanophotonic structure for realizing a scalable and practical daytime radiative cooling device without a glaring reflective surface.
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発行日 | 2020-04-16
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出版物タイトル |
Scientific Reports
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巻 | 10巻
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号 | 1号
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出版者 | Nature
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開始ページ | 6486
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ISSN | 2045-2322
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資料タイプ |
学術雑誌論文
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言語 |
英語
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OAI-PMH Set |
岡山大学
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著作権者 | © The Author(s) 2020
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論文のバージョン | publisher
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PubMed ID | |
DOI | |
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関連URL | isVersionOf https://doi.org/10.1038/s41598-020-63591-7
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ライセンス | http://creativecommons.org/licenses/by/4.0/
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