期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201909383
关键词
aerogels; cellulose; nanofibers; organic electronics; poly(3; 4-ethylenedioxythiophene)
类别
资金
- Swedish Stiftelsen for Strategisk Forskning (SSF)
- 3D Bioprinting Center (Chalmers University of Technology, Gothenburg, Sweden)
- Division of Wood Chemistry and Pulp Technology (KTH Royal Institute of Technology, Stockholm, Sweden)
- Wenner-Gren Foundation
- Swedish Research Council Formas
- Nouryon AB
- Wallenberg Wood Science Center
This study presents a novel, green, and efficient way of preparing crosslinked aerogels from cellulose nanofibers (CNFs) and alginate using non-covalent chemistry. This new process can ultimately facilitate the fast, continuous, and large-scale production of porous, light-weight materials as it does not require freeze-drying, supercritical CO2 drying, or any environmentally harmful crosslinking chemistries. The reported preparation procedure relies solely on the successive freezing, solvent-exchange, and ambient drying of composite CNF-alginate gels. The presented findings suggest that a highly-porous structure can be preserved throughout the process by simply controlling the ionic strength of the gel. Aerogels with tunable densities (23-38 kg m(-3)) and compressive moduli (97-275 kPa) can be prepared by using different CNF concentrations. These low-density networks have a unique combination of formability (using molding or 3D-printing) and wet-stability (when ion exchanged to calcium ions). To demonstrate their use in advanced wet applications, the printed aerogels are functionalized with very high loadings of conducting poly(3,4-ethylenedioxythiophene):tosylate (PEDOT:TOS) polymer by using a novel in situ polymerization approach. In-depth material characterization reveals that these aerogels have the potential to be used in not only energy storage applications (specific capacitance of 78 F g(-1)), but also as mechanical-strain and humidity sensors.
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