Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Focus Session: Wetting on Adaptive Substrates I (joint session CPP/DY/O)
O 75.3: Vortrag
Donnerstag, 21. März 2024, 10:15–10:30, H 0107
Wetting Phenomena in Hierarchically Porous Silicon: How Experiments and 2D Fluid-Dynamic Simulations Complement Each Other — •Stella Gries1,2, Stefan Schulz1, Marc Thelen1,2, Silja Flenner3, Imke Greving3, and Patrick Huber1,2 — 1Institute for Materials and X-ray Physics, Hamburg University of Technology, Hamburg, Germany — 2Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 3Institute of Materials Physics, Helmholtz Zentrum Hereon, Geesthacht, Germany
Nature is an expert in designing highly efficient, multi-functional (hybride-)materials such as hierarchically capillary systems in respiratory systems or plants. These systems achieve large internal surfaces while allowing an optimized mass transport. This is used in plants to perform capillarity- induced motions, transport substances to reaction sites and remove educts from chemical processes. We are aiming to mimic such systems with artificially produced hierarchically porous silicon. The bimodal, hierarchical structure leads to a different imbibition behavior than porous systems with a monomodal pore-size distribution. Therefore, we used 2D finite element fluid dynamic simulations to achieve deeper insights into single-pore events and competing Laplace pressures in pore sections with distinct pore sizes. The simulations are related to the experimental results from dilatometry, mass-uptake and synchrotron-based, in-situ X-ray radiography imbibition experiments. This allows a complete description of the transport phenomena and will help us to tailor the material for applications in capillarity-driven pumps or energy harvesting from natural processes.