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Electrolysis-Driven Reversible Actuation using Micromachined pH-sensitive Hydrogel

Authors
Campbell, RebeccaButon, DianeSong, Seung H.Kim, Albert
Issue Date
Jan-2021
Publisher
Institute of Electrical and Electronics Engineers Inc.
Keywords
Actuator; electrolysis; hydrogel; micromachining
Citation
Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), v.2021-January, pp 705 - 708
Pages
4
Journal Title
Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)
Volume
2021-January
Start Page
705
End Page
708
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146754
DOI
10.1109/MEMS51782.2021.9375411
ISSN
1084-6999
Abstract
While volume changing hydrogel is well studied for a sensing application, its mechanical actuation can also be implemented for a reversible actuation. In this paper, we present an electrolytically controllable soft actuator that utilizes a chemo-mechanical volume changing property of hydrogel. By incorporating micropatterning and electrolysis electrodes on a hydrogel surface, environmental stimuli (i.e., pH) can be localized, resulting in a precisely controlled, large displacement, reversible actuation. Patterned and non-patterned pH-sensitive poly(methacrylic acid-co-acrylamide) hydrogel is studied using a DC voltage (5 V). The hydrogel with a dimension of 5 mm by 5 mm by 0.5 mm with line patterns (t = 40 μm) via a laser machining demonstrated 2 mm in maximum actuation displacement, which is a three-fold improvement in the range of motion compared to a non-patterned hydrogel. It is anticipated that the presented actuator design and mechanism can be applied to an underwater walker or gripper. ? 2021 IEEE.
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첨단소재·전자융합공학부 (지능형전자시스템전공)
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