Regensburg 2019 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 6: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research
MM 6.5: Talk
Monday, April 1, 2019, 13:00–13:15, H44
Magic Colloidal Clusters: 3D Investigation of Self-assembled Polystyrene Particles forming Agglomerations in Crystalline Order using X-Ray Nano- and Electron Tomography — •Silvan Englisch1, Janis Wirth1, Thomas Pryzbilla1, Benjamin Apeleo Zubiri1, Junwei Wang2, Nicolas Vogel2, and Erdmann Spiecker1 — 1Institute of Micro- and Nanostructure Research , Friedrich Alexander-University of Erlangen-Nuremberg (FAU), Germany — 2Institute of Particle Technology at the FAU
X-ray tomography (XRT) and electron tomography (ET) allow 3D investigations across multiple length scales. Morphological segmentation of the tomographic reconstructions of complex sample structures enables in-depth quantitative and position-correlating analyses. So-called magic colloidal clusters are self-organized structures (or assembies) of polystyrene colloidal particles. XRT/ET were employed to study the exact 3D positions of each individual primary particle. A sufficiently high contrast in the acquired reconstructions, which is important for a reliable segmentation of the 3D datasets, is challenging to achieve since the samples are reaching the limits of XRT (resolution) and ET (size). On the one side, a morphology-threshold filter (software: Arivis) was applied to segment the original reconstructions and determine the 3D positions of the spherical and monodisperse primary particles. On the other side, spheres with a particle-size matching diameter were fitted to these positions in a virtual volume. These workflows allow to investigate the exact structure and possible defects in such magic colloidal clusters.