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A Mössbauer study of the chemical stability of iron oxide nanoparticles in PMMA and PVB beads |
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| Authors: | Wei Chen Steen Mørup Mikkel F Hansen Tobias Banert Urs A Peuker |
| Institution: | 1. Department of Physics, Technical University of Denmark, Building 307, DK-2800 Kongens Lyngby, Denmark;2. College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050016, PR China;3. Department of Micro and Nanotechnology, Technical University of Denmark, DTU Nanotech, Building 345 East, DK-2800 Kongens Lyngby, Denmark;4. Institute of Chemical Engineering, Clausthal University of Technology, D-38678 Clausthal-Zellerfeld, Germany |
| Abstract: | We have prepared magnetic beads consisting of iron oxide nanoparticles in a polymethyl methacrylate (PMMA) and a polyvinyl butyral (PVB) matrix. High-field Mössbauer studies show that the particles have an almost perfect collinear spin structure and magnetization measurements show that they are superparamagnetic at room temperature at a time scale of seconds. We have followed the oxidation of the particles, which initially have a stoichiometry close to magnetite. The oxidation is fast during the first 2–3 weeks and then continues slowly such that even after 30 weeks the particles have not completely transformed to maghemite. The PVB beads are hydrophilic and biocompatible and are therefore well suited for applications in medicine and biology. |
| Keywords: | 76 80 +y 75 50 Tt 81 16 Be 81 65 Mq |
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