Ambient-Dried, 3D-Printable and Electrically Conducting Cellulose Nanofiber Aerogels by Inclusion of Functional Polymers
Journal article, 2020

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.

organic electronics

nanofibers

cellulose

aerogels

poly(3,4-ethylenedioxythiophene)

Author

Hugo Françon

Royal Institute of Technology (KTH)

Zhen Wang

Royal Institute of Technology (KTH)

Andrew Marais

Royal Institute of Technology (KTH)

Katarzyna Mystek

Royal Institute of Technology (KTH)

Andrew Piper

Royal Institute of Technology (KTH)

Hjalmar Granberg

Innventia AB

Abdellah Malti

Royal Institute of Technology (KTH)

Paul Gatenholm

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Paul Gatenholm Group

Per A. Larsson

Royal Institute of Technology (KTH)

L. Wagberg

Royal Institute of Technology (KTH)

Advanced Functional Materials

1616-301X (ISSN)

Vol. 30 12 1909383

Subject Categories

Polymer Chemistry

Paper, Pulp and Fiber Technology

Polymer Technologies

DOI

10.1002/adfm.201909383

More information

Latest update

9/15/2020