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High-Power Hydro-Actuators Fabricated from Biomimetic Carbon Nanotube Coiled Yarns with Fast Electrothermal Recovery

Authors
Son, WonkyeongLee, Jae MyeongKim, Shi HyeongKim, Hyeon WooCho, Sung BeomSuh, DongseokChun, SungwooChoi, Changsoon
Issue Date
23-3월-2022
Publisher
AMER CHEMICAL SOC
Keywords
power density; hydro-actuator; biomimetics; carbon nanotube yarn; electrothermal recovery
Citation
NANO LETTERS, v.22, no.6, pp.2470 - 2478
Indexed
SCIE
SCOPUS
Journal Title
NANO LETTERS
Volume
22
Number
6
Start Page
2470
End Page
2478
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/141897
DOI
10.1021/acs.nanolett.2c00250
ISSN
1530-6984
Abstract
Bioinspired yarn/fiber structured hydro-actuators have recently attracted significant attention. However, most water-driven mechanical actuators are unsatisfactory because of the slow recovery process and low full-time power density. A rapidly recoverable high-power hydro-actuator is reported by designing biomimetic carbon nanotube (CNT) yarns. The hydrophilic CNT (HCNT) coiled yarn was prepared by storing pre-twist into CNT sheets and subsequent electrochemical oxidation (ECO) treatment. The resulting yarn demonstrated structural stability even when one end was cut off without the possible loss of pre-stored twists. The HCNT coiled yarn actuators provided maximal contractile work of 863 J/kg at 11.8 MPa stress when driven by water. Moreover, the recovery time of electrically heated yarns at a direct current voltage of 5 V was 95% shorter than that of neat yarns without electric heating. Finally, the electrothermally recoverable hydro-actuators showed a high actuation frequency (0.17 Hz) and full-time power density (143.8 W/kg).
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