Dresden 2026 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster II
CPP 46.9: Poster
Donnerstag, 12. März 2026, 09:30–11:30, P5
Comparison of mechanical properties and pore collapse characteristics of hyperuniform disordered anodic aluminium oxide membranes — •Rang Noh1, Clara Twiehaus2, Marc Thelen1, Alexander Sprafke3, Prerak Dhawan3, Ralf Wehrspohn3, Martin Steinhart2, and Patrick Huber1,4 — 1Institute for Materials and X-ray Physics, Hamburg University of Technology, Hamburg, Germany — 2Institute of Chemistry of New Materials, Osnabrück University, Osnabrück, Germany — 3Institute of Physics, Martin Luther University of Halle-Wittenberg, Halle (Saale), Germany — 4Center for X-ray and Nano Science CXNS, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
We investigate how the degree of disorder in hyperuniform Porous Anodic Aluminum Oxide (AAO) membranes influences their mechanical properties and pore-collapse behavior. Elastic moduli of AAO were measured using two different methods; Laser Ultrasonics (LUS) and nanoindentation. The indented points were captured by scanning electron microscopy to observe pore collapse characteristics. The elastic moduli from LUS and nanoindentation agree well; in general, the elastic modulus increases as both porosity and the hyperuniformity index decrease. Even at similar porosity levels, enhanced hyperuniformity results a higher elastic modulus. When the pores are ordered, the pore collapse follows directional grain paths around the indented edge and propagate further in a connected herringbone like pattern. But, in the disordered state, the irregular collapse happens, producing direction-independent crack propagation within the restricted region.
Keywords: Hyperuniform; Anodic Aluminum Oxide; Mechanical property; Laser Ultrasonics; Nanoindentation