6533b873fe1ef96bd12d4b8c

RESEARCH PRODUCT

Magnetic Composite Thin Films of FexOy Nanoparticles and Photocrosslinked Dextran Hydrogels

Stefanie UtechStefanie UtechUlrich JonasAnnette BrunsenWolfgang KnollMichael Maskos

subject

chemistry.chemical_classificationMaterials scienceComposite numberNanoparticlePolymerCondensed Matter PhysicsElectronic Optical and Magnetic Materialschemistry.chemical_compoundchemistryChemical engineeringSelf-healing hydrogelsMagnetic nanoparticlesSurface plasmon resonanceThin filmIron oxide nanoparticles

description

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.

yearjournalcountryeditionlanguage
2012-04-01Journal of Magnetism and Magnetic Materials
https://doi.org/10.1016/j.jmmm.2011.11.039