Highly-Scattering Cellulose-Based Films for Radiative Cooling
Jaramillo Fernández, Juliana (Institut Català de Nanociència i Nanotecnologia)
Yang, Han (University of Chinese Academy of Sciences)
Schertel, Lukas (University of Cambridge. Department of Chemistry)
Whitworth, Guy L. (Institut Català de Nanociència i Nanotecnologia)
Garcia, Pedro David (Institut Català de Nanociència i Nanotecnologia)
Vignolini, Silvia (University of Cambridge. Department of Chemistry)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)

Data:	2022
Resum:	Passive radiative cooling (RC) enables the cooling of objects below ambient temperature during daytime without consuming energy, promising to be a game changer in terms of energy savings and CO2 reduction. However, so far most RC surfaces are obtained by energy-intensive nanofabrication processes or make use of unsustainable materials. These limitations are overcome by developing cellulose films with unprecedentedly low absorption of solar irradiance and strong mid-infrared (mid-IR) emittance. In particular, a cellulose-derivative (cellulose acetate) is exploited to produce porous scattering films of two different thicknesses, L ≈ 30 µm (thin) and L ≈ 300 µm (thick), making them adaptable to above and below-ambient cooling applications. The thin and thick films absorb only ≈5% of the solar irradiance, which represents a net cooling power gain of at least 17 W m−2, compared to state-of-the-art cellulose-based radiative-cooling materials. Field tests show that the films can reach up to ≈5 °C below ambient temperature, when solar absorption and conductive/convective losses are minimized. Under dryer conditions (water column = 1 mm), it is estimated that the films can reach average minimum temperatures of ≈7-8 °C below the ambient. The work presents an alternative cellulose-based material for efficient radiative cooling that is simple to fabricate, cost-efficient and avoids the use of polluting materials.
Ajuts:	European Commission 793643 European Commission 639088 European Commission 963872 European Commission 665919 European Commission 721062 Ministerio de Ciencia e Innovación SEV-2017-0706 Agencia Estatal de Investigación PGC2018-101743-B-I00 Agencia Estatal de Investigación RTI2018-093921-A-C44 Ministerio de Economía y Competitividad RYC-2015-18124
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Cellulose ; High mid-infrared emittance ; Low solar absorption ; Radiative cooling ; Scattering
Publicat a:	Advanced science, Vol. 9, Issue 8 (January 2022) , art. 2104758, ISSN 2198-3844

DOI: 10.1002/advs.202104758
PMID: 35038253

8 p, 1.7 MB

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