Berlin 2018 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 43: Nanomaterials
MM 43.1: Vortrag
Mittwoch, 14. März 2018, 17:00–17:15, H 0106
Exploiting Electrocapillary Coupling at Metal Surfaces for Active Strain Sensing with Nanoporous Gold — •Charlotte Stenner1, Li-Hua Shao2, Nadiia Mameka3, and Jörg Weissmüller1,3 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Germany — 2Institute of Solid Mechanics Beihang University, China — 3Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Germany
We inspect a hybrid material consisting of two separate phases, nanoporous gold (NPG) and electrolyte. The metal acts as an electrode, which is polarized against the electrolyte. NPG has a large surface-to-volume ratio therefore the properties of the hybrid material are particularly determined by the metal-electrolyte interface. Our experiments show that space charge and potential couple to mechanical deformation of the hybrid material, so that external loading induces either an electric current or a potential variation. The generated electric signals are strain-dependent, robust, and strong. We introduce a theoretical strain-sensing actuation relation to connect both effects measured on the NPG-based hybrid material. The theoretical relation leads to excellent agreement with the experimental results. [1]
[1] C. Stenner, L.-H. Shao, N. Mameka, and J. Weissmüller, Adv. Funct. Mater. 26 (2016) 5174