7 papers
3D evolution of protein networks and lipid globules in heat-treated egg yolk
Felix Wittwer, Nimmi Das Anthuparambil, Frederik Unger +5
Upon heating, egg yolk transforms from a liquid to a gel due to protein denaturation. This process can serve as a useful model to better understand protein denaturation in general.…
Multi-modal strain mapping of steel crack tips with micrometer spatial resolution
Ahmar Khaliq, Felix Wittwer, Markus Hartmann +6
Due to their superior fatigue strength, martensitic steels are the material of choice for high cyclic loading applications such as coil springs. However, crack propagation is influ…
X-ray Strain and Stress Tensor Tomography
Peter Modregger, James. A. D. Ball, Felix Wittwer +2
The microscopic distribution of strain and stress plays a crucial role for the performance, safety, and lifetime of components in aeronautics, automotive and critical infrastructur…
Ultimate Sensitivity in X-ray Diffraction: Angular Moments vs. Shot Noise
Peter Modregger, Felix Wittwer, Ahmar Khaliq +6
The sensitivity of x-ray diffraction experiments towards Bragg peak parameters constitutes a crucial performance attribute of experimental setups. Frequently, diffraction peaks are…
Measurements of dislocations in 4H-SiC with rocking curve imaging
Ahmar Khaliq, Felix Wittwer, Niklas Pyrlik +9
4H Silicon Carbide (4H-SiC) combines many attractive properties such as a high carrier mobility, a wide bandgap, and a high thermal conductivity, making it an ideal candidate for h…
Annular x-ray optics offer superior resolution for radiation sensitive samples
Felix Wittwer, Peter Modregger
High-resolution x-ray microscopy requires a high photon flux to measure the signal from weakly scattering samples. This exposes samples to high radiation doses, potentially damagin…