@misc{cheng_semiordered_hierarchical_2017, author={Cheng, C., Luehrs, L., Krekeler, T., Ritter, M., Weissmueller, J.}, title={Semiordered Hierarchical Metallic Network for Fast and Large Charge-Induced Strain}, year={2017}, howpublished = {journal article}, doi = {https://doi.org/10.1021/acs.nanolett.7b01526}, abstract = {Nanoporous metallic actuators for artificial muscle applications are distinguished by combining the low operating voltage, which is otherwise reserved for polymer-based actuators with interesting values of strain amplitude, strength, and stiffness that are comparable of those of piezoceramics. We report a nanoporous metal actuator with enhanced strain amplitude and accelerated switching. Our 3D macroscopic metallic muscle has semiordered and hierarchical nanoporous structure, in which μm-sized tubes align perpendicular with the sample surface, while nm-sized ligaments consist of the tube walls. This nanoarchitecture combines channels for fast ion transportation with large surface area for charge storage and strain generation. The result is a record reversible strain amplitude of 1.59% with a strain rate of 8.83 × 10–6 s–1 in the field of metallic based actuators. A passive hydroxide layer is self-grown on the metal surface, which not only contributes a supercapacitive layer, but also stabilizes the nanoporous structure against coarsening, which guarantees sustainable actuation beyond ten-thousand cycles.}, note = {Online available at: \url{https://doi.org/10.1021/acs.nanolett.7b01526} (DOI). Cheng, C.; Luehrs, L.; Krekeler, T.; Ritter, M.; Weissmueller, J.: Semiordered Hierarchical Metallic Network for Fast and Large Charge-Induced Strain. Nano Letters. 2017. vol. 17, no. 8, 4774-4780. DOI: 10.1021/acs.nanolett.7b01526}}