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Making flexible magnetic aerogels and stiff magnetic nanopaper using cellulose nanofibrils as templates
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Engineering Material Physics.ORCID iD: 0000-0003-4889-4210
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2010 (English)In: Nature Nanotechnology, ISSN 1748-3387, Vol. 5, no 8, 584-588 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
NATIVE CELLULOSE, HIGH-COERCIVITY, NANOPARTICLES, COMPOSITES, PARTICLES
Identifiers
URN: urn:nbn:se:kth:diva-29416DOI: 10.1038/NNANO.2010.155ISI: 000280631900011Scopus ID: 2-s2.0-77956421847OAI: oai:DiVA.org:kth-29416DiVA: diva2:398120
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
QC 20110216Available from: 2011-02-16 Created: 2011-02-02 Last updated: 2011-02-16Bibliographically approved

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Belova, LiubovStröm, ValterBerglund, Lars A.

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Fibre and Polymer TechnologyWallenberg Wood Science CenterEngineering Material PhysicsBiocomposites

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