Hierarchical Incorporation of Reduced Graphene Oxide into Anisotropic Cellulose Nanofiber Foams Improves Their Thermal Insulation.

Autor: Hadi SE; Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden.; Wallenberg Wood Science Center, Department of Materials and Environmental Chemistry, Stockholm University, 10691 Stockholm, Sweden., Möller E; Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden.; Department of Chemistry, Philipps-Universität Marburg, 35032 Marburg, Germany., Nolte S; Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden.; Institute of Inorganic Chemistry, Leibniz University Hannover, D-30167 Hannover, Germany., Åhl A; Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden., Donzel-Gargand O; Ångström Solar Center, Division of Solar Cell Technology, Uppsala University, 751 21 Uppsala, Sweden., Bergström L; Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden.; Wallenberg Wood Science Center, Department of Materials and Environmental Chemistry, Stockholm University, 10691 Stockholm, Sweden., Holm A; Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden.; Wallenberg Wood Science Center, Department of Materials and Environmental Chemistry, Stockholm University, 10691 Stockholm, Sweden.; Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, SE-60174 Norrköping, Sweden.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 Aug 28; Vol. 16 (34), pp. 45337-45346. Date of Electronic Publication: 2024 Aug 13.
DOI: 10.1021/acsami.4c09654
Abstrakt: Anisotropic cellulose nanofiber (CNF) foams represent the state-of-the-art in renewable insulation. These foams consist of large (diameter >10 μm) uniaxially aligned macropores with mesoporous pore-walls and aligned CNF. The foams show anisotropic thermal conduction, where heat transports more efficiently in the axial direction (along the aligned CNF and macropores) than in the radial direction (perpendicular to the aligned CNF and macropores). Here we explore the impact on axial and radial thermal conductivity upon depositing a thin film of reduced graphene oxide (rGO) on the macropore walls in anisotropic CNF foams. To obtain rGO films on the foam walls we developed liquid-phase self-assembly to deposit rGO in a layer-by-layer fashion. Using electron and ion microscopy, we thoroughly characterized the resulting rGO-CNF foams and confirmed the successful deposition of rGO. These hierarchical rGO-CNF foams show lower radial thermal conductivity (λ r ) across a wide range of relative humidity compared to CNF control foams. Our work therefore demonstrates a potential method for improved thermal insulation in anisotropic CNF foams and introduces versatile self-assembly for postmodification of such foams.
Databáze: MEDLINE
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