Electrolysis-Driven Reversible Actuation using Micromachined pH-sensitive Hydrogel
- Authors
- Campbell, Rebecca; Buton, Diane; Song, 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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