期刊
NANO LETTERS
卷 22, 期 6, 页码 2470-2478出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c00250
关键词
power density; hydro-actuator; biomimetics; carbon nanotube yarn; electrothermal recovery
类别
资金
- Korea Institute of Industrial Technology [KITECH EH220002]
- Basic Science Research Programs through the National Research Foundation of Korea [NRF-2017R1A6A3A04004987, NRF2021R1A2C2005281]
A rapidly recoverable high-power hydro-actuator has been achieved by designing biomimetic carbon nanotube yarns, which demonstrate structural stability and high contractile work, recovery speed, actuation frequency, and power density.
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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