Diffusion dynamics of water and citrate molecules on the surface of iron oxide nanoparticles
Iron oxide nanoparticles (IONPs) are employed in many areas ranging from biomedicine to heterogeneous catalysis and feature a solid-liquid interface in many applications. Despite much progress in the structural characterization of NPs, experimental insight into the structure and dynamics of solid-liquid interfaces is rare. Quasielastic neutron scattering (QENS) was used to access the dynamics of water molecules at the surface of TiO2, SnO2 and BaSO4 NPs. Yet, the dynamics of ligand molecules are largely unknown up to now, although they are commonly employed for size-selective NP synthesis and long-term colloidal stability. Our recent EASY proposal at IN16B has shown that fixed window scans both elastic and inelastic provide information about the dynamics of the citrate molecules in dry powders and of water in wet powders. Now, we wish to investigate rotational and translational diffusion modes for citrate-capped IONPs at 4 relative humidities, corresponding to nominally dry powders (11%), mono- (43 %) and bilayers (68 %), and multiple layers (96 %). From these data, as well as a for D2O-equilibrated sample, we expect a detailed insight into the complex interfacial ligand dynamics.
The data is currently only available to download if you are a member of the proposal team.
The recommended format for citing this dataset in a research publication is in the following format:
Mirijam Zobel; APPEL Markus; FEGHELM Anna; MAGERL Andreas and THOMAE Sabrina. (2021). Diffusion dynamics of water and citrate molecules on the surface of iron oxide nanoparticles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-648
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This data is not yet public
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