We investigate the behavior of materials exposed to energetic particle irradiation. The work contributes to the program NUSAFE (Nuclear Waste Management, Safety and Radiation Research) of the Helmholtz Association.
Neutron irradiation provokes the formation and long-term evolution of nm-scale defects such as dislocation loops and solute atom clusters. These defects give rise to hardening accompanied by a reduced fracture resistance of reactor pressure vessel steels of running nuclear power plants. Materials for advanced reactor concepts will be exposed to higher operation temperatures and higher neutron doses. The overall objectives of our research are to identify the mechanisms of irradiation-induced damage in structural materials and to assess the resulting changes of the mechanical properties.
We work on two main directions:
- In the case of running nuclear power plants, the work is focused on long-term irradiation effects in reactor pressure vessel steels.
- Our work in the field of advanced reactor concepts is dedicated to ferritic/martensitic Cr-steels, oxide dispersion strengthened (ODS) steels and the emerging class of high-entropy alloys.
The new insight substantially contributes to the scientific background for the safety assessment of nuclear reactors. The work is embedded in the Euratom projects SOTERIA, MATISSE and M4F. A close cooperation with the Fundamentals and Simulation Group provides additional insight via atomistic simulation.
- Mechanical testing of irradiated materials
- Characterization at the nm length scale
- Ion irradiation to emulate neutron irradiation effects
Preparation of Volborthite by a Facile Synthetic Chemical Solvent Extraction Method
In this work, the extraction of vanadium (V) ions from an alkaline solution using a commercial quaternary ammonium salt and the production of metal vanadates through precipitation stripping were carried out. The crystallization of copper vanadates from the extracts was performed using a solution containing a copper(II) source in concentrated chloride media as a stripping agent. In an attempt to control growth, a stabilizing polymer (polyvinylpyrrolidone, PVP) was added to the stripping solution. The structural characteristics of the crystallized products, mainly copper pyrovanadate (volborthite, Cu3V2O7(OH)2·(H2O)2) nanoflakes and nanoflowers and the experimental parameter influencing the efficiency of the stripping process were studied. From the results, the synthesis of nanostructured vanadates is a simple and versatile method for the fabrication of valuable three-dimensional structures providing abundant active zones for energy and catalytic applications.
Keywords: vanadium(V) extraction; anion exchange; quaternary ammonium salt; precipitation stripping; nanostructured vanadates; volborthite; polyvinylpyrrolidone
Nanomaterials 13(2023), 1977
|Name||Bld./Office||+49 351 260|
|Dr. Eberhard Altstadt||801/P151||2276||e.altstadthzdr.de|
|Dr. Cornelia Kaden||801/P102firstname.lastname@example.org, c.heintzehzdr.de|
|Name||Bld./Office||+49 351 260|
|Dr. Frank Bergner||801/P150||3186||f.bergnerhzdr.de|
|Dr. Jann-Erik Brandenburg||801/P152||2301||j.brandenburghzdr.de|
|Dr. Paul Chekhonin||801/P146||2149||p.chekhoninhzdr.de|
|Dr. Andreas Ulbricht||801/P146||3155||a.ulbrichthzdr.de|