SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 42: Interface Controlled Properties and Nanomaterials: Nanoporous Materials and Nanolaminates
MM 42.4: Vortrag
Donnerstag, 30. März 2023, 16:30–16:45, SCH A 215
Structural analysis of hierarchical nanoporous gold — •Lukas Riedel1, Jürgen Markmann1,2, Jörg Weissmüller2,1, and Shan Shi3,1 — 1Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, Geesthacht, Germany — 2Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany — 3Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technology, Hamburg, Germany
Hierarchical nanoporous metals offer the possibility to produce mechanically stable materials with a reduced solid fraction [1], which therefore qualify for lightweight application. Here, hierarchical nanoporous gold is produced from Ag90Au10, following a three-step procedure which consists of first dealloying, coarsening and second dealloying. The ligament size on the upper and the lower hierarchy level can be tuned independently. In addition to scanning electron microscopy (SEM), small- and ultra-small-angle X-ray scattering (SAXS/USAXS) are applied for structural analysis and show consistent results. Descriptive parameters including length scale, specific surface area and pore volume fraction are obtained. From a comparison of the length scale parameters, ligament diameter and mean ligament distance, a conversion factor is yielded. Ultra-small-angle X-ray scattering was found to be suitable for the analysis of structures with a ligament size range of several hundreds of nanometers.
[1] S. Shi, Y. Li, B.-N. Ngo-Dinh, J. Markmann and J. Weissmüller, Scaling behavior of stiffness and strength of hierarchical network nanomaterials, Science 371 (6533), 2021.