Influence of dextran coating on the magnetic behaviour of iron oxide nanoparticles |
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| Authors: | Silvio Dutz,Wilfried Andrä ,Rudolf Hergt,Robert Mü ller,Christiane Oestreich,Christopher Schmidt,Jorg Tö pfer,Matthias Zeisberger,Matthias E. Bellemann |
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| Affiliation: | 1. Institute for Physical High Technology, Albert-Einstein-Strasse 9, 07745 Jena, Germany;2. Department of Biomedical Engineering, University of Applied Sciences, Jena, Germany;3. Institute of Ceramic Materials, Freiberg University of Mining and Technology, Germany;4. Department of Materials Engineering, University of Applied Sciences, Jena, Germany |
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| Abstract: | Magnetic iron oxide nanoparticles with mean diameters in the range from 10 to 30 nm were prepared by modified chemical precipitation routes. The particles were suspended in an aqueous solution by coating of the particles with carboxymethyldextran. A stability against agglomeration was achieved over a period of more than 7 days. In the present investigation, the structural and the magnetic properties of the nanoparticles were investigated. The influence of the dextran shell on the strength of the dipole–dipole interactions between the neighbouring particles was determined by investigation of the remanence behaviour (Henkel plot) of coated as well as of uncoated particles. |
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| Keywords: | Henkel plot Hysteresis Magnetic loss Magnetite Specific heating power |
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