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MM: Fachverband Metall- und Materialphysik

MM 42: Interface Controlled Properties and Nanomaterials: Nanoporous Materials and Nanolaminates

MM 42.6: Vortrag

Donnerstag, 30. März 2023, 17:15–17:30, SCH A 215

Wetting and Drying Dynamics in Hierarchically Porous Silicon: An In-Situ X-Ray Microscopy Study — •Stella Gries^1,2,3, Laura Gallardo Domínguez^1,2,3, Mark Busch^1,2,3, Mariia Liseanskaia^1,2,3, Juan Sánchez Calzado^1,2,3, Mathis Boderius^1,2,3, Silja Flenner⁴, Imke Greving⁴, and Patrick Huber^1,2,3 — ¹Institute for Materials and X-Ray Physics, Hamburg University of Technology, Hamburg, Germany — ²Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — ³Center for Hybrid Nanostructures CHyN, University of Hamburg, Hamburg, Germany — ⁴Institute of Materials Physics, Helmholtz Zentrum Hereon, Geesthacht, Germany

Hierarchical porosities consist of small, often nano-scaled pores as well as large, macroscopic pores to simultaneously achieve large inner surfaces in combination with optimized mass transport. The investigation of capillary dynamics within optically opaque hierarchically porous membranes necessitates sophisticated microscopy techniques. First hints to unveil the dynamics are obtained from lab-scale experiments, e.g. mass-uptake as a function of time or the mechanical response depending upon wetting and drying in dilatometry. However, these techniques do not spatially resolve on the rising liquid front, which is achieved with transmission X-ray microscopy (TXM). The samples are scanned in radiography (2D) and tomography (3D) to resolve both the static structure and the capillary dynamics. These findings can help to tailor hierarchical porous materials for their designated application and to tune the dynamics depending on the needs.