このエントリーをはてなブックマークに追加
ID 60714
フルテキストURL
fulltext.pdf 2.79 MB
著者
Suichi, Takahiro Department of Electrical and Electronic Engineering, Okayama University
Ishikawa, Atsushi Department of Electrical and Electronic Engineering, Okayama University ORCID Kaken ID publons
Tanaka, Takuo Metamaterials Laboratory, RIKEN Cluster for Pioneering Research
Hayashi, Yasuhiko Department of Electrical and Electronic Engineering, Okayama University ORCID Kaken ID researchmap
Tsuruta, Kenji Department of Electrical and Electronic Engineering, Okayama University ORCID Kaken ID publons researchmap
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.
発行日
2020-04-16
出版物タイトル
Scientific Reports
10巻
1号
出版者
Nature
開始ページ
6486
ISSN
2045-2322
資料タイプ
学術雑誌論文
言語
English
OAI-PMH Set
岡山大学
著作権者
© The Author(s) 2020
論文のバージョン
publisher
PubMed ID
DOI
Web of Science KeyUT
関連URL
isVersionOf https://doi.org/10.1038/s41598-020-63591-7
ライセンス
http://creativecommons.org/licenses/by/4.0/