Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.21: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Ferromagnetic Cellulose Nanocomposite for Coating and Filament Production toward Flexible Electronic Materials — •Andrei Chumakov1, K. Gordeyeva2, C.J. Brett1,2, D. Menzel3, A.V. Riazanova2, M. Schwartzkopf1, and D. Soederberg2 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2KTH Royal Institute of Technology, Stockholm, Sweden — 3Technische Universität Braunschweig, Braunschweig, Germany
Nanocellulose is a renewable, lightweight, and robust platform for sustainable flexible electronics. Imparting stable ferromagnetism enables thin, patternable, biodegradable components for sensing, tagging, and memory. We report a ferromagnetic nanocomposite via electrostatic co-assembly of negatively charged cellulose nanofibrils (-1360 µmol g−1) with positively charged strontium hexaferrite nanoplatelets. Opposite charges ensure homogeneous dispersion and high coercivity retention of the final composite. Spray-coated films (10-100 nm) on silicon show uniform loading, in-plane nanoplatelet alignment (SEM/SAXS/WAXS), and coercive fields matching hard-magnetic particles. In parallel, we produce magnetic filaments by (i) co-extruding aligned CNFs with ferrites via gelation and (ii) coating CNF yarns with ferrite sheaths. These fibers retain nanocellulose’s high specific modulus ( 60 GPa·cm3/g) and >1000 MPa strength while gaining magnetic functionality. Together, these coatings and fibers offer a scalable, water-based techniques to magnetically active, biodegradable media.
Keywords: cellulose; hexaferrite; magnetic nanopaticles; SAXS; colloidal solution