Making flexible magnetic aerogels and stiff magnetic nanopaper using cellulose nanofibrils as templates
2010 (English)In: Nature Nanotechnology, ISSN 1748-3387, Vol. 5, no 8, 584-588 p.Article in journal (Refereed) Published
Nanostructured biological materials inspire the creation of materials with tunable mechanical properties(1-3). Strong cellulose nanofibrils derived from bacteria(4) or wood(5,6) can form ductile or tough networks(7,8) that are suitable as functional materials(9,10). Here, we show that freeze-dried bacterial cellulose nanofibril aerogels can be used as templates for making lightweight porous magnetic aerogels, which can be compacted into a stiff magnetic nanopaper. The 20-70-nm-thick cellulose nanofibrils act as templates for the non-agglomerated growth of ferromagnetic cobalt ferrite nanoparticles(11) (diameter, 40-120 nm). Unlike solvent-swollen gels(12) and ferrogels(13-15), our magnetic aerogel is dry, lightweight, porous (98%), flexible, and can be actuated by a small household magnet. Moreover, it can absorb water and release it upon compression. Owing to their flexibility, high porosity and surface area, these aerogels are expected to be useful in microfluidics devices and as electronic actuators.
Place, publisher, year, edition, pages
2010. Vol. 5, no 8, 584-588 p.
NATIVE CELLULOSE, HIGH-COERCIVITY, NANOPARTICLES, COMPOSITES, PARTICLES
IdentifiersURN: urn:nbn:se:kth:diva-29416DOI: 10.1038/NNANO.2010.155ISI: 000280631900011ScopusID: 2-s2.0-77956421847OAI: oai:DiVA.org:kth-29416DiVA: diva2:398120
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 201102162011-02-162011-02-022011-02-16Bibliographically approved