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Publisher DOI: 10.1002/admi.202001415
Title: Nanoporous-gold-polypyrrole hybrid materials for millimeter-sized free standing actuators
Language: English
Authors: Roschning, Benedikt 
Weissmüller, Jörg 
Keywords: actuation; nanoporous gold; polypyrrole; strain-charge coupling
Issue Date: 4-Nov-2020
Source: Advanced Materials Interfaces 24 (7): 2001415 (2020)
Abstract (english): 
Advanced Materials Interfaces published by Wiley-VCH GmbH This work studies the actuation of hybrid materials made from nanoporous gold, polypyrrole, and aqueous electrolyte. The deposition protocol affords a conformal polypyrrole coating on the entire internal interface of millimeter-sized nanoporous metal specimens made by dealloying. The hybrid material emerges when the remaining pore space is filled with perchloric acid. The metal serves as load-bearing and electronically conductive substrate, the polypyrrole as functional active component for actuation, and the aqueous electrolyte provides a pathway for fast ionic conduction. In this way, an actuator material is obtained that can be manufactured as monolithic bodies that can be subjected to compressive loads. Actuators with dimensions of millimeters in each spatial direction achieve characteristic times for actuation in the order of seconds and their work density is comparable to that of state-of-the-art piezoceramics. As a remarkable finding, the actuation strain scales with the square of the polypyrrole phase fraction. This is surprising in view of the linear scaling predicted by conventional micromechanical models. A micromechanical model that explains this behavior as the result of polypyrrole bridges that link adjacent struts of the metal skeleton is presented.
DOI: 10.15480/882.3219
ISSN: 2196-7350
Journal: Advanced materials interfaces 
Institute: Werkstoffphysik und -technologie M-22 
Document Type: Article
Project: SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle 
Projekt DEAL 
License: CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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