Details
| Original language | English |
|---|---|
| Pages (from-to) | 45337–45346 |
| Number of pages | 10 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 16 |
| Issue number | 34 |
| Early online date | 13 Aug 2024 |
| Publication status | Published - 28 Aug 2024 |
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.
Keywords
- cellulose nanofiber foam, CNF, insulation, layer-by-layer, reduced graphene oxide, self-assembly, thermal conductivity
ASJC Scopus subject areas
Sustainable Development Goals
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In: ACS Applied Materials and Interfaces, Vol. 16, No. 34, 28.08.2024, p. 45337–45346.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Hierarchical Incorporation of Reduced Graphene Oxide into Anisotropic Cellulose Nanofiber Foams Improves Their Thermal Insulation
AU - Hadi, Seyed Ehsan
AU - Möller, Elias
AU - Nolte, Sina
AU - Åhl, Agnes
AU - Donzel-Gargand, Olivier
AU - Bergström, Lennart
AU - Holm, Alexander
N1 - Publisher Copyright: © 2024 The Authors. Published by American Chemical Society.
PY - 2024/8/28
Y1 - 2024/8/28
N2 - 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.
AB - 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.
KW - cellulose nanofiber foam
KW - CNF
KW - insulation
KW - layer-by-layer
KW - reduced graphene oxide
KW - self-assembly
KW - thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=85201370565&partnerID=8YFLogxK
U2 - 10.1021/acsami.4c09654
DO - 10.1021/acsami.4c09654
M3 - Article
AN - SCOPUS:85201370565
VL - 16
SP - 45337
EP - 45346
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
SN - 1944-8244
IS - 34
ER -