Water dynamics on iron oxide nanoparticles
Nanoparticles (NPs) still come along with many open questions, concerning even basic properties like their defect inventory or the structure of the interfaces in solution. Recently, we made a significant contribution by proving a restructuring of water around NPs reaching out to some three layers through careful PDF analysis. However, the infiltration of the solvent into the ligand shell remains unknown. With this proposal, we want to take a different approach by deriving structural evidence from dynamical information. We expect that motions of water and ligand molecules at NP surfaces occur in different time regimes, largely unknown at present. Nevertheless, they should become apparent in fixed window scans in backscattering spectroscopy, both in the elastic and inelastic mode (offset by ~3 times the instrumental energy resolution). TGA and water vapour sorption measurements support this. With this application, we propose to undertake an exploratory endeavor by fixed window scans on IN16B. We will use 7 nm , citrate-capped IONPs. For two suggested runs on IN16B, we will prepare a nominally dry sample and one with a nominal coverage of the IONPs by 2 layers of water molecules.
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Mirijam Zobel and APPEL Markus. (2020). Water dynamics on iron oxide nanoparticles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-636
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