Electrically driven heartbeat effect of gallium-based liquid metal on a ratchet

被引:2
|
作者
Wang, Shutong [1 ,2 ]
Zhang, Yue [3 ]
Wang, Jiuyang [1 ]
Ren, Dongmei [2 ]
Yu, Zhenwei [1 ,4 ]
机构
[1] Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen Inst Adv Elect Mat, Shenzhen, Peoples R China
[2] Bohai Univ, Coll Chem & Mat Engn, Jinzhou, Peoples R China
[3] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Bioinspired Mat & Interfacial Sci, Beijing, Peoples R China
[4] Beihang Univ, Sch Chem, Key Lab Bioinspired Smart Interfacial Sci & Techno, Minist Educ, Beijing, Peoples R China
基金
中国国家自然科学基金;
关键词
liquid metal; heartbeat; asymmetric structure; surface tension; droplet manipulation; SURFACE-TENSION;
D O I
10.3389/fbioe.2022.1094482
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The realization of the liquid metal heartbeat effect shows better controllability under non-periodic stimuli than spontaneous oscillation or periodic stimuli. However, adjusting the liquid metal heartbeat performance, drop spreading area, and frequency, solely by the magnitude of the voltage, has great limitations. Here, we demonstrate that the eGaIn drop can beat inside graphite ring electrodes under DC voltage in alkaline solutions on ratchet substrates. These sawtooth structures provide asymmetric textures which influence liquid metal deformation during the beating of the heart. We achieved heartbeat frequencies from 2.7 to 4.8 Hz, a 100% increase in the tunable frequency range compared to that on a flat surface. The oxidative spreading of the eGaIn drop on the ratchet substrate shows that the drop penetrates into the grooves of the sawtooth structure. Moreover, we investigated the physical mechanisms affecting the eGaIn heartbeat frequency and the influence on the spreading area of the eGaIn drop at various sawtooth sizes and orientations. These findings not only enhance our understanding of droplet manipulation on sawtooth-structured surfaces but also facilitate the design of microfluidic pump systems.
引用
收藏
页数:7
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