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Top-Down Approach M...
Top-Down Approach Making Anisotropic Cellulose Aerogels as Universal Substrates for Multifunctionalization
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- Garemark, Jonas (författare)
- KTH,Wallenberg Wood Science Center,Fiber- och polymerteknologi,KTH Royal Inst Technol, Dept Fiber & Polymer Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden.
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- Yang, Xuan (författare)
- KTH,Wallenberg Wood Science Center,Fiber- och polymerteknologi,KTH Royal Inst Technol, Dept Fiber & Polymer Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden.
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- Sheng, Xia (författare)
- KTH,Organisk kemi,KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Chem, S-10044 Stockholm, Sweden.
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- Cheung, Ocean (författare)
- Uppsala universitet,Nanoteknologi och funktionella material,Department of Engineering Sciences, Nanotechnology and Functional Materials, Uppsala University, 75121 Uppsala, Sweden
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- Sun, Licheng, 1962- (författare)
- KTH,Organisk kemi,KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Dept Chem, S-10044 Stockholm, Sweden.
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- Berglund, Lars, 1956- (författare)
- KTH,Wallenberg Wood Science Center,Fiber- och polymerteknologi,KTH Royal Inst Technol, Dept Fiber & Polymer Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden.
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- Li, Yuanyuan (författare)
- KTH,Wallenberg Wood Science Center,Fiber- och polymerteknologi,KTH Royal Inst Technol, Dept Fiber & Polymer Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden.
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(creator_code:org_t)
- 2020-05-15
- 2020
- Engelska.
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Ingår i: ACS Nano. - : AMER CHEMICAL SOC. - 1936-0851 .- 1936-086X. ; 14:6, s. 7111-7120
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Abstract
Ämnesord
Stäng
- Highly porous, strong aerogels with anisotropic structural properties are of great interest for multifunctional materials for applications including insulators in buildings, filters for oil cleanup, electrical storage devices, etc. Contemporary aerogels are mostly extracted from fossil resources and synthesized from bottom-up techniques, often requiring additional strategies to obtain high anisotropy. In this work, a universal approach to prepare porous, strong, anisotropic aerogels is presented through exploiting the natural hierarchical and anisotropic structure of wood. The preparation comprises nanoscale removal of lignin, followed by dissolution-regeneration of nanofibers, leading to enhanced cell wall porosity with nanofibrillated networks occupying the pore space in the cellular wood structure. The aerogels retain structural anisotropy of natural wood, exhibit specific surface areas up to 247 m(2)/g, and show high compression strength at 95% porosity. This is a record specific area value for wood aerogels/foams and even higher than most cellulose-based aerogels for its assigned strength. The aerogel can serve as a platform for multifunctional composites including scaffolds for catalysis, gas separation, or liquid purification due to its porous matrix or as binder-free electrodes in electronics. To demonstrate the multifunctionality, the aerogels are successfully decorated with metal nanoparticles (Ag) and metal oxide nanoparticles (TiO2) by in situ synthesis, coated by the conductive polymer (PEDOT:PSS), and carbonized to yield conductive aerogels. This approach is found to be a universal way to prepare highly porous anisotropic aerogels.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Kompositmaterial och -teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Composite Science and Engineering (hsv//eng)
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
Nyckelord
- aerogel
- anisotropy
- top-down
- wood nanotechnology
- biocomposite
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