Magneto-responsive hybrid materials based on cellulose nanocrystals |
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Authors: | Tiina Nypelö Carlos Rodriguez-Abreu José Rivas Michael D Dickey Orlando J Rojas |
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Institution: | 1. Department of Forest Biomaterials, North Carolina State University, Campus Box 8005, Raleigh, NC, 27695-8005, USA 2. INL-International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal 3. Department of Chemical and Biomolecular Engineering, North Carolina State University, Campus Box 7905, Raleigh, NC, 27695-7905, USA 4. Department of Forest Products Technology, Aalto University School of Chemical Technology, P.O. Box 16300, 00076, Aalto, Espoo, Finland
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Abstract: | We fabricated self-standing films of cellulose nanocrystals (CNC) and electrospun composite fibers with CNC and polyvinyl alcohol both with magnetic properties arising from cobalt iron oxide nanoparticles in the CNC matrix. Aqueous dispersions of cobalt-iron oxide nanoparticles (10–80 nm diameter) and CNCs (ca. 150 nm length) were used as precursor systems for the films and composite fibers. The properties of the hybrid material were determined by electron and atomic force microscopy, X-ray diffraction, thermogravimetry and magnetometry. The CNC-inorganic system was ferromagnetic, with a saturation magnetization of ca. 20 emu g?1 of the magnetic phase. We demonstrate potential applications of the precursor dispersions, including magnetic fluid hyperthermia and highlight possible uses of the CNC-based magneto-responsive systems in biomedical and magneto-optical components. |
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