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MM: Fachverband Metall- und Materialphysik
MM 27: Topical Session: Interface-dominated phenomena - Nanoporous Metals
MM 27.4: Vortrag
Dienstag, 17. März 2020, 15:00–15:15, IFW A
Electrochemically driven actuation and change in Young’s modulus of nanoporous metal-conductive polymer actuator under external load — •Jie Li1, Jürgen Markmann1,2, Jörg Weissmüller1,2, and Nadiia Mameka1 — 1Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics — 2Hamburg University of Technology, Institute of Materials Physics and Technology
Nanoporous (np-) metals made by dealloying may be considered as promising low-voltage electro- and chemo-mechanical actuators with a good combination of actuation strain, stiffness and strength [1]. The actuation performance of np metals can be further improved by electrodeposition of conductive polymers on the pore surface [2]. Here, we study hybrid electroactuator from np Au and polypyrrole (PPy). Upon electric charging in an aqueous electrolyte, the material exhibits actuation as well as large modulation in stiffness. We point out that the stiffness change can strongly affect the actuation efficiency-as described by the maximum work density-particularly when the actuator operates under external mechanical load [3]. We employ a dynamic mechanical analysis with an electrochemical control to study the impact of the applied load on the actuation and the Young’s modulus variation. The conditions under which the np Au/PPy actuator shows enlarged actuation amplitudes along with enhanced elastic response will be discussed. [1] L.-H. Shao et al., RSC Nanoscience-Nanotechnology 2012, 22, 137. [2] K. Wang et al, Sens Actuator B Chem, 2017, 248, 622. [3] L.-Z. Liu et al, Phys Rev Mat, 2019, 3, 066001.