Dresden 2017 – wissenschaftliches Programm
MM 44: Topical session: Interface-Controlled Microstructures: Mechanical Properties and Mechano-Chemical Coupling - Nano-porous materials
MM 44.4: Vortrag
Mittwoch, 22. März 2017, 12:30–12:45, IFW B
Hierarchically structured nanomaterials — •Benedikt Roschning1 and Jörg Weissmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany — 2Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
Porous microstructures used as functional materials often demand contradictory requirements on the pore size, which may be tackled by hierarchical structures consisting of porosity on different length scales. The aim of our project is the development of manufacturing routines for hierarchically structured nanomaterials combining different electrochemical approaches. Previous work focused on the preparation of nanoporous gold via corrosion of a dilute Au-Ag solid solution yielding a nanoporous Au-Ag alloy as intermediate product . Coarsening creates the upper hierarchy level which can be corroded a second time to create the lower hierarchy level. However, corrosion induced shrinkage leads to intense crack formation making the material unsuitable for mechanical applications. Addition of Pt to the master alloy favors a high Au retention in the first dealloying step, reduces the shrinkage, prevents crack formation and allows the production of mm sized samples . Yet, complete corrosion of the specimen and functionalization need to be shown.
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