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Magnetic Composite Thin Films of FexOy Nanoparticles and Photocrosslinked Dextran Hydrogels |
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| Authors: | Annette Brunsen Stefanie Utech Michael Maskos |
| Affiliation: | a Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany b Department of Chemistry, Technical University Darmstadt, Petersenstr. 22, 64287 Darmstadt, Germany c Johannes Gutenberg University Mainz, Institute of Physical Chemistry, Jakob-Welder-Weg 11, 55099 Mainz, Germany d Institut für Mikrotechnik Mainz GmbH (IMM), Carl-Zeiss-Str. 18-20, 55129 Mainz, German e Austrian Institute of Technology, Tech Gate Vienna, Donau-City-Str. 1, 1220 Wien, Austria f Macromolecular Chemistry, Department Chemistry — Biology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany g Foundation for Research and Technology - Hellas (FORTH), Institute of Electronic Structure & Laser (IESL), Bio-Organic Materials Chemistry Laboratory (BOMCLab), Nikolaou Plastira 100, Vassilika Vouton, 71110 Heraklion, Crete, Greece |
| Abstract: | Magnetic hydrogel composites are promising candidates for a broad field of applications from medicine to mechanical engineering. Here, surface-attached composite films of magnetic nanoparticles (MNP) and a polymeric hydrogel (HG) were prepared from magnetic iron oxide nanoparticles and a carboxymethylated dextran with photoreactive benzophenone substituents. A blend of the MNP and the dextran polymer was prepared by mixing in solution, and after spin-coating and drying the blend film was converted into a stable MNP-HG composite by photocrosslinking through irradiation with UV light. The bulk composite material shows strong mobility in a magnetic field, imparted by the MNPs. By utilizing a surface layer of a photoreactive adhesion promoter on the substrates, the MNP-HG films were covalently immobilized during photocrosslinking. The high stability of the composite was documented by rinsing experiments with UV-Vis spectroscopy, while surface plasmon resonance and optical waveguide mode spectroscopy was employed to investigate the swelling behavior in dependence of the nanoparticle concentration, the particle type, and salt concentration. |
| Keywords: | Magnetic nanoparticles Iron oxide Carboxymethyldextran Hydrogel films Photocrosslinking |
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