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Structurally Colore...
Structurally Colored Cellulose Nanocrystal Films as Transreflective Radiative Coolers
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- Shanker, Ravi (författare)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten,Wallenberg Wood Science Center
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- Anusuyadevi, Prasaanth Ravi (författare)
- KTH,Fiber- och polymerteknologi,Royal Inst Technol KTH, Sweden; MS Ramaiah Inst Technol, India
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- Gamage, Sampath (författare)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten,Wallenberg Wood Science Center
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- Hallberg, T. (författare)
- FOI Swedish Def Res Agcy, Dept Electroopt Syst, S-58330 Linkoping, Sweden
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- Kariis, H. (författare)
- FOI Swedish Def Res Agcy, Dept Electroopt Syst, S-58330 Linkoping, Sweden
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- Banerjee, Debashree (författare)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten
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- Svagan, Anna Justina (författare)
- KTH,Fiber- och polymerteknologi,Royal Inst Technol KTH, Sweden
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- Jonsson, Magnus, 1981- (författare)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten,Wallenberg Wood Science Center
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(creator_code:org_t)
- 2022-06-06
- 2022
- Engelska.
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Ingår i: ACS Nano. - : American Chemical Society (ACS). - 1936-0851 .- 1936-086X. ; 16:7, s. 10156-10162
- Relaterad länk:
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https://doi.org/10.1...
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https://liu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Radiative cooling forms an emerging direction in which objects are passively cooled via thermal radiation to cold space. Cooling materials should provide high thermal emissivity (infrared absorptance) and low solar absorptance, making cellulose an ideal and sustainable candidate. Broadband solar-reflective or transparent coolers are not the only systems of interest, but also more pleasingly looking colored systems. However, solutions based on wavelength-selective absorption generate not only color but also heat and thereby counteract the cooling function. Intended as coatings for solar cells, we demonstrate a transreflective cellulose material with minimal solar absorption that generates color by wavelength-selective reflection, while it transmits other parts of the solar spectrum. Our solution takes advantage of the ability of cellulose nanocrystals to self-assemble into helical periodic structures, providing nonabsorptive films with structurally colored reflection. Application of violet-blue, green, and red cellulose films on silicon substrates reduced the temperature by up to 9 °C under solar illumination, as result of a combination of radiative cooling and reduced solar absorption due to the wavelength-selective reflection by the colored coating. The present work establishes self-assembled cellulose nanocrystal photonic films as a scalable photonic platform for colored radiative cooling.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- atmospheric transparency window
- cellulose nanocrystals
- passive radiative cooling
- self-assembly
- structural colors
- thermal radiation
- Absorption spectroscopy
- Cellulose
- Cellulose derivatives
- Cellulose films
- Coatings
- Color
- Nanocrystals
- Self assembly
- Solar cells
- Atmospheric transparency
- Nanocrystal films
- Radiative cooling
- Selective reflection
- Solar absorption
- Structural color
- Transreflective
- Wavelength-selective
- Heat radiation
- Infrared Radiation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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