Hierarchical Incorporation of Reduced Graphene Oxide into Anisotropic Cellulose Nanofiber Foams Improves Their Thermal Insulation
- verfasst von
- Seyed Ehsan Hadi, Elias Möller, Sina Nolte, Agnes Åhl, Olivier Donzel-Gargand, Lennart Bergström, Alexander Holm
- Abstract
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 (λr) 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.
- Organisationseinheit(en)
-
Institut für Anorganische Chemie
- Externe Organisation(en)
-
Stockholm University
Philipps-Universität Marburg
Uppsala University
Linkoping University
- Typ
- Artikel
- Journal
- ACS Applied Materials and Interfaces
- Band
- 16
- Seiten
- 45337–45346
- Anzahl der Seiten
- 10
- ISSN
- 1944-8244
- Publikationsdatum
- 28.08.2024
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Allgemeine Materialwissenschaften
- Ziele für nachhaltige Entwicklung
- SDG 7 – Erschwingliche und saubere Energie
- Elektronische Version(en)
-
https://doi.org/10.1021/acsami.4c09654 (Zugang:
Offen)
