Abstract
We have implemented a time-dependent (dynamic) x-ray tomography of sedimenting micro-spheres suspended in water. To achieve phase contrast at high magnification we use the divergent and highly coherent beam emitted from an x-ray waveguide. Holograms are recorded with 5 ms acquisition time while the sample is rotated at 1 Hz, over a run of 40 s. We show that under these conditions, more than 20 000 individual particle trajectories can be tracked. The analysis of the trajectories shows apparent super-diffusive behavior due to collective flow patterns, as also further evidenced by plotting the temporal averaged spatial distribution of particle densities and velocities.
Highlights
To cite this article: A Ruhlandt and T Salditt 2019 New J
Sedimentation is known as an important process in geology and biology, and is one of the oldest technical processes to separate particles from liquids
Interesting non-equilibrium effects such as shock-like fronts [3], stratification [4], and colloidal crystallisation kinetics [5] can be observed in sedimentation [6], and velocity correlations due to the long-range hydrodynamical interactions of the particles are of particular relevance [7, 8]
Summary
To cite this article: A Ruhlandt and T Salditt 2019 New J. Time-resolved x-ray phase-contrast tomography of sedimenting microspheres Commons Attribution 3.0 We have implemented a time-dependent (dynamic) x-ray tomography of sedimenting micro-spheres licence.
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