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Semiordered hierarchical metallic network for fast and large charge-induced strain
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Cheng, Chuan, Lührs, Lukas, Krekeler, Tobias, Ritter, Martin and Weissmüller, Jörg (2017) Semiordered hierarchical metallic network for fast and large charge-induced strain. Nano Letters, 17 (8). pp. 4774-4780. doi:10.1021/acs.nanolett.7b01526 ISSN 1530-6984.
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Official URL: http://dx.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.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Journal or Publication Title: | Nano Letters | ||||||||
Publisher: | American Chemical Society | ||||||||
ISSN: | 1530-6984 | ||||||||
Official Date: | 2017 | ||||||||
Dates: |
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Volume: | 17 | ||||||||
Number: | 8 | ||||||||
Page Range: | pp. 4774-4780 | ||||||||
DOI: | 10.1021/acs.nanolett.7b01526 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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