From Chitosan to Chitin: Bio‐Inspired Thin Films for Passive Daytime Radiative Cooling

Author:

Lauster Tobias1,Mauel Anika2,Herrmann Kai1,Veitengruber Viktoria1,Song Qimeng1,Senker Jürgen2,Retsch Markus3ORCID

Affiliation:

1. Department of Chemistry Physical Chemistry I University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany

2. Department of Chemistry Inorganic Chemistry III and Northern Bavarian NMR Center University of Bayreuth 95447 Universitätsstraße 30 Bayreuth Germany

3. Department of Chemistry Physical Chemistry I Bavarian Polymer Institute Bayreuth Center for Colloids and Interfaces and Bavarian Center for Battery Technology (BayBatt) University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany

Abstract

AbstractPassive radiative daytime cooling is an emerging technology contributing to carbon‐neutral heat management. Optically engineered materials with distinct absorption and emission properties in the solar and mid‐infrared range are at the heart of this technology. Owing to their low emissive power of about 100 W m−2 during daytime, substantial areas need to be covered with passive cooling materials or coatings to achieve a sizeable effect on global warming. Consequently, biocompatible materials are urgently needed to develop suitable coatings with no adverse environmental impact. It is shown how chitosan films with different thicknesses can be produced from slightly acidic aqueous solutions. The conversion to their insoluble form chitin in the solid state is demonstrated and the conversion is monitored with infrared (IR) and NMR spectroscopy. In combination with a reflective backing material, the films show below‐ambient temperature cooling capabilities with a suitable emissivity in the mid‐IR region and low solar absorption of 3.1–6.9%, depending on the film thickness. This work highlights the potential of chitosan and chitin as widely available biocompatible polymers for passive radiative cooling applications.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)

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