Regensburg 2025 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 9: Poster
MM 9.12: Poster
Montag, 17. März 2025, 18:30–20:30, P1
Linking Characteristic Length Scale in Nanoporous Gold to Alloy Composition and Dealloying Parameters — •Celina Passig1,2, Jürgen Markmann2,1, and Jörg Weißmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Germany — 2Hybrid Materials Systems, Institute of Hydrogen Technology, Helmholtz-Zentrum Hereon, Geesthacht, Germany
Nanoporous metals display unique material properties due to their high volume-specific surface area and characteristic sizes of pores and ligaments. Although theories of structure formation exist, the process is not yet fully understood. Investigating nanoporous gold as model system will deepen the understanding of the underlying mechanisms, enabling a more precise manipulation of nanoporous structures and their mechanical and functional properties. Therefore, a series of small-angle X-ray scattering (SAXS) data was measured, comparing AuAg alloy compositions subjected to different dealloying potentials, durations, and electrolyte concentrations. Preliminary dependencies were formulated to investigate how these parameters influence the resulting characteristic length scale. This ex-situ and future in-situ analysis of microstructural evolution can be used to identify the underlying mechanisms by validating simulated results of the same dealloying processes, such as those presented by Li et al. [Acta Mater. 222 (2022) 117424.].
Keywords: SAXS; nanoporous; gold; characteristic length scale; dealloying