Masterarbeiten

An X-ray subsystem was integrated into the ANTARES neutron imaging instrument (FRM II/MLZ)to enable dual-modality radiography and computed tomography without relocating the specimen.The upgrade comprises a compact source–detector assembly within the instrument envelope, integrationwith the existing interlock/safety architecture, and networked control used during commissioningto coordinate motion and acquisition. A pre-commissioning calibration workflow producesdetector products (dark/flat maps for DSNU/PRNU, a defect mask, and a stabilizer), performs geometriccalibration/rectification, and determines cone-beam parameters for the X-ray arm. [...]

This thesis develops a multiscale view of humidity-driven ionic transport in bioderivedpolysaccharide films of alginate (AA) and chitosan (CH), with and withoutcellulose nanofibers (CNFs), linking molecular water dynamics to macroscopic conductivity.Through-plane conductivity was measured by electrochemical impedance spectroscopy(EIS) at 10/50/80% relative humidity using thickness-averaged geometry factors andcomplementary bulk-resistance estimators with explicit uncertainties. Hydration andhydrogen-bond organization were tracked by FTIR using a robust, area-based metricS1 (integral of the OH stretch, 3600–3000 cm−1), which captures concurrent growth,broadening, and small shifts more reliably than peak height. [...]

Among organic cathode candidates for Aqueous Zinc-Ion Batteries (AZIBs), polyaniline (PANI)offers unique advantages owing to its high theoretical capacity, reversible redox chemistry, andintrinsic electronic conductivity [1]. However, its practical implementation is fundamentally hinderedby humidity-driven structural degradation and unstable electrochemical behavior in aqueousenvironments [2,3]. [...]

The effect of ion-specific hydration on the structure and charge transport of zinc-salt dopedpolyzwitterionic poly(2-(N-3-sulfopropyl-N,N-dimethyl ammonium)ethyl methacrylate) (PSBMA)has been investigated using electrochemical impedance spectroscopy (EIS), Fourier-transforminfrared (FTIR) spectroscopy, and quasi-elastic neutron scattering (QENS). Accordingto the Hofmeister series, the zinc salts ZnSO4, Zn(CH3COO)2, and ZnI2 serve as stronglykosmotropic, moderately kosmotropic, and chaotropic representatives, respectively. [...]

applications increased. However, solar cells used in space have to face significant challenges. [...]