Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 30: Interface Controlled Properties, Nanomaterials, and Microstructure Design II
MM 30.4: Talk
Thursday, March 12, 2026, 11:00–11:15, SCH/A215
Small-angle x-ray scattering of nanoporous gold - a discussion of the structure factor and its implications for local order — •Celina Passig1,2, Jürgen Markmann2,1, and Jörg Weissmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Germany — 2Department Hybrid Materials Systems, Institute of Hydrogen Technology, Helmholtz-Zentrum Hereon, Geesthacht, Germany
Nanoporous gold (NPG) made by dealloying is a popular model system for studies of size and interface effects as well as microstructure evolution in nanomaterials. Here, we investigate to what extent information on the microstructural geometry may be obtained by Small-Angle X-Ray Scattering (SAXS). It is well established that NPG exhibits a sharp interference peak, indicative of a characteristic wavelength underlying its leveled-wave-like microstructure and, hence, of an exceptional degree of order. Remarkably, our measurements even reveal a secondary peak at larger wave number. We compare the experimental data to simulations for small-angle scattering of NPG generated (1) by kinetic Monte Carlo (KMC) studies of dealloying or (2) as leveled-wave structures. On that basis, we discuss in how far the secondary interference peak is intrinsic to the microstructure of idealized, uniform NPG and what information it provides on the geometry of that microstructure. Since the feature vanishes during coarsening, we inspect how this process affects the order of the ligament network.
Keywords: dealloying; small-angle scattering; nanomaterials; nanoporous metals; microstructure evolution