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Radiative cooling and indoor light management enabled by a transparent and self-cleaning polymer-based metamaterial

Huang, Gan 1; Yengannagari, Ashok R. 1; Matsumori, Kishin 1; Patel, Prit 1; Datla, Anurag 1; Trindade, Karina 1; Amarsanaa, Enkhlen 1; Zhao, Tonghan ORCID iD icon 1; Köhler, Uwe 1; Busko, Dmitry 1; Richards, Bryce S. ORCID iD icon 1,2
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)
2 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)

Abstract:

Transparent roofs and walls offer a compelling solution for harnessing natural light. However, traditional glass roofs and walls face challenges such as glare, privacy concerns, and overheating issues. In this study, we present a polymer-based micro-photonic multi-functional metamaterial. The metamaterial diffuses 73% of incident sunlight, creating a more comfortable and private indoor environment. The visible spectral transmittance of the metamaterial (95%) surpasses that of traditional glass (91%). Furthermore, the metamaterial is estimated to enhance photosynthesis efficiency by ~9% compared to glass roofs. With a high emissivity (~0.98) close to that of a mid-infrared black body, the metamaterial is estimated to have a cooling capacity of ~97 W/m2 at ambient temperature. The metamaterial was about 6 °C cooler than the ambient temperature in humid Karlsruhe. The metamaterial exhibits superhydrophobic performance with a contact angle of 152°, significantly higher than that of glass (26°), thus potentially having excellent self-cleaning properties.


Verlagsausgabe §
DOI: 10.5445/IR/1000171001
Veröffentlicht am 04.06.2024
Originalveröffentlichung
DOI: 10.1038/s41467-024-48150-2
Scopus
Zitationen: 9
Web of Science
Zitationen: 5
Dimensions
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000171001
Erschienen in Nature Communications
Verlag Nature Research
Band 15
Heft 1
Seiten Art.-Nr.: 3798
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 07.05.2024
Nachgewiesen in Web of Science
Dimensions
Scopus
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