Dresden 2017 – wissenschaftliches Programm
MM 44: Topical session: Interface-Controlled Microstructures: Mechanical Properties and Mechano-Chemical Coupling - Nano-porous materials
MM 44.1: Topical Talk
Mittwoch, 22. März 2017, 11:30–12:00, IFW B
Manipulating interfaces in nanoporous metals: Towards robust nanostructured materials with novel functionalities — •Nadiia Mameka — Helmholtz-Zentrum Geesthacht, Institut für Werkstoffforschung, Werkstoffmechanik, 21502 Geesthacht, Germany
Nanoporous metals formed via dealloying emerge as a new class of nanomaterials in which high mechanical strength and stiffness can be successfully combined with diverse functional properties. The materials offer facile and controllable modification of their numerous internal interfaces through: i) tailoring size of their structural nanoscale constituents – nanoligaments – via thermal or electrochemical annealing, and ii) reversible altering of electronic and/or chemical structure of the nanoligaments by external stimuli.
The talk aims at demonstrating how imposing the consequences of both surface engineering approaches can be for actuation, strain sensing, and mechanical response of nanoporous metals with macroscopic dimensions. Here, the functionalities arise from electrocapillary coupling at the metal/fluid interface in hybrid composites made from nanoporous gold and aqueous electrolytes, where the control over the interface properties is realized by reversible changes of external control variables (surface charge density and/or adsorbate coverage) as the function of the electrode potential. The possibilities for further improvements of structural and functional properties in such hybrid nanomaterials will be also discussed.