1. Reflective and transparent cellulose-based passive radiative coolers
- Author
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Xavier Crispin, Md. Mehebub Alam, Magnus Berggren, Ravi Shanker, Ayesha Sultana, Dan Zhao, Sampath Gamage, Debashree Banerjee, T. Hallberg, Christina Åkerlind, Hans Kariis, and Magnus P. Jonsson
- Subjects
Materials science ,Polymers and Plastics ,Radiative cooling ,Silicon ,Infrared ,business.industry ,chemistry.chemical_element ,Radiation ,Polymer Chemistry ,Casting ,chemistry ,Thermal radiation ,Polymerkemi ,Radiative transfer ,Emissivity ,Optoelectronics ,Daytime passive radiative cooling ,Nanocellulose ,Reflective coolers ,Transparent coolers ,Atmospheric transmittance ,Radiative cooling materials ,business - Abstract
Radiative cooling passively removes heat from objects via emission of thermal radiation to cold space. Suitable radiative cooling materials absorb infrared light while they avoid solar heating by either reflecting or transmitting solar radiation, depending on the application. Here, we demonstrate a reflective radiative cooler and a transparent radiative cooler solely based on cellulose derivatives manufactured via electrospinning and casting, respectively. By modifying the microstructure of cellulose materials, we control the solar light interaction from highly reflective (> 90%, porous structure) to highly transparent (approximate to 90%, homogenous structure). Both cellulose materials show high thermal emissivity and minimal solar absorption, making them suitable for daytime radiative cooling. Used as coatings on silicon samples exposed to sun light at daytime, the reflective and transparent cellulose coolers could passively reduce sample temperatures by up to 15 degrees C and 5 degrees C, respectively. Funding Agencies|Linkoping University
- Published
- 2021
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