Dresden 2017 – wissenschaftliches Programm
MM 44: Topical session: Interface-Controlled Microstructures: Mechanical Properties and Mechano-Chemical Coupling - Nano-porous materials
MM 44.6: Vortrag
Mittwoch, 22. März 2017, 13:00–13:15, IFW B
Hierarchical Nanoporous Nickel as Bulk Electrochemical Actuators — •Chuan Cheng1, Lukas Lührs1, Tobias Krekeler2, and Jörg Weissmüller1 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, 21073 Hamburg, Germany — 2Central Division of Electron Microscopy, Hamburg University of Technology, 21073 Hamburg, Germany
Materials which can mimic the properties of mammal muscles upon outside electrical/chemical triggering are called artificial muscles. Commercialized actuation materials such as piezoceramics, electroactive polymers and shape memory alloys are restricted by ultra-high actuation voltages, or small strain amplitude, or rather low energy efficiency. In the last decade, increasing attention has been paid to nanostructured materials, including nanoporous metals, carbon nanotubes, conducting polymers, nanographene, and so on, to transform electrochemical energy into mechanical energy for potential applications as artificial muscles. Nanoporous metals for artificial muscle applications have unique combination of low operating voltage, relatively high strain amplitude, high strength and stiffness compared with high voltage operated piezoceramics and soft polymer based actuators. We present a 3-D macroscopic actuator composed of nanoporous structured nickel with dual-scaled pores, in which the large sized pores facilitate fast ion transfer kinetics and small sized pores contributed to the large surface area for surface charge storage and strain generation. Advanced actuation performances with both high strain amplitude and strain rate were obtained.