SKM 2021 – wissenschaftliches Programm

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SYHN: Symposium Hybrid Nanomaterials: From Novel Physics and Multi-Scale Self-Organization to Functional Diversity on the Device Scale

SYHN 1: Hybrid Nanomaterials: From Novel Physics and Multi-Scale Self-Organization to Functional Diversity on the Device Scale

SYHN 1.1: Hauptvortrag

Donnerstag, 30. September 2021, 10:00–10:30, Audimax 1

Scaling behavior of stiffness and strength of hierarchical network nanomaterials — •Shan Shi — Institut für Werkstoffmechanik, Helmholtz-Zentrum Hereon, Geesthacht — Institut für Werkstoffphysik und -technologie, Technische Universität Hamburg, Hamburg

Structural hierarchy is known to optimize mechanical behavior in deliberately designed structures and natural materials. The benefits of hierarchy implementing the high strength of nanoscale objects into hierarchical structures would lead to even more interesting mechanical characteristics. Yet, truly nanoscale structures with a prohibitive number of struts in any macroscopic bodies have not been demonstrated in load-bearing form that could be subjected to mechanical tests.

Here, we prepared macroscopic, crack-free nested network nanomaterials "hierarchical nanoporous gold" by two-stage self-organization processes of dealloying, which processes allow for large samples contained over trillions of struts to be synthesized. Macro-compression tests indicate the hierarchical architecture affords enhanced strength and stiffness. The experiments are well supported by our proposed scaling laws for the stiffness and strength for nested network with different numbers of hierarchy levels and by atomistic simulations. Therefore, this work for the first time demonstrated that structural hierarchy brings enhanced mechanics for truly nanoscale network materials.