Reversible Electrochemically Triggered Delamination Blistering of Hydrogel Films on Micropatterned Electrodes

Xu, Ben, Liu, Qihan, Suo, Zhigang and Hayward, Ryan (2016) Reversible Electrochemically Triggered Delamination Blistering of Hydrogel Films on Micropatterned Electrodes. Advanced Functional Materials, 26 (19). pp. 3218-3225. ISSN 1616-301X

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Electro-blister paper - 02-04-16__RH_BX-highlighted.docx - Accepted Version

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Official URL: http://dx.doi.org/10.1002/adfm.201504769

Abstract

Stimuli responsive elastic instabilities provide opportunities for controlling the structures and properties of polymer surfaces, offering a range of potential applications. Here, a surface actuator based on a temperature and electrically responsive poly(N-isopropyl acrylamide-co-sodium acrylate) hydrogel that undergoes a two-step delimitation and buckling instability triggered using micropatterned electrodes is described. The electrically actuated structures entail large out-of-plane displacements that take place on time-scales of less than 1 s, in response to modest triggering voltages (−3–6 V). Alongside these experimental observations, finite element simulations are conducted to better understand the two-step nature of the instability. In the first step, hydrogel films undergo delamination and formation of blisters, facilitated by electrochemical reduction of the thiol groups anchoring the film to the electrodes. Subsequently, at larger reducing potentials, the electrolytic current is sufficient to nucleate a gas bubble between the electrode and the gel, causing the delaminated region to adopt a straight-sided blister shape. Finally, thermally induced deswelling of the gel allows the film to be returned to its flat state and readhered to the electrode, thereby allowing for repeated actuation.

Item Type: Article
Additional Information: Attached file to go under 12-month embargo when from publication date PB 23-2-16
Subjects: F200 Materials Science
H300 Mechanical Engineering
J400 Polymers and Textiles
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Ben Xu
Date Deposited: 22 Feb 2016 09:52
Last Modified: 01 Apr 2017 03:30
URI: http://nrl.northumbria.ac.uk/id/eprint/26064

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