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Making flexible magnetic aerogels and stiff magnetic nanopaper using cellulose nanofibrils as templates
KTH.
Nanocomposites and Bioconcepts s.a.r.l., N170 Tanalt Alhouda (Agadir), .
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
KTH.
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2010 (English)In: Nature Nanotechnology, ISSN 1748-3387, E-ISSN 1748-3395, Vol. 5, 584-588 p.Article in journal (Refereed) Published
Abstract [en]

Nanostructured biological materials inspire the creation of materials with tunable mechanical properties. Strong cellulose nanofibrils derived from bacteria or wood can form ductile or tough networks that are suitable as functional materials. 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 (diameter, 40-120 nm). Unlike solvent-swollen gels and ferrogels, 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, 584-588 p.
Keyword [en]
Nanomaterials
National Category
Other Basic Medicine
Research subject
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-41697DOI: 10.1038/nnano.2010.155ISI: 000280631900011PubMedID: 20676090OAI: oai:DiVA.org:su-41697DiVA: diva2:332369
Available from: 2010-08-04 Created: 2010-08-04 Last updated: 2017-12-12Bibliographically approved

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