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Distinct dynamics of self-propelled bowl-shaped micromotors caused by shape effect: Concave vs convex

文献类型：期刊论文

作者Wang, Duo1,2,3; Guan, Dongshi1,2; Su, Jinghong1,2,3; Zheng, Xu2; Hu, Guoqing3; Wang D(王铎)
刊名PHYSICS OF FLUIDS
出版日期2021-12-01
卷号33期号:12页码:11
ISSN号1070-6631
DOI10.1063/5.0076060
通讯作者Zheng, Xu(zhengxu@lnm.imech.ac.cn) ; Hu, Guoqing(ghu@zju.edu.cn)
英文摘要Although artificial micromotors with unconventional shapes are emerging as a powerful tool in various applications, little research has been undertaken to clarify their propulsion mechanism, especially how the shape effect alters the bubble dynamics and hydrodynamic flows. In this study, we fabricated two types of bowl-shaped micromotors to investigate the distinct dynamics due to the shape effect of concave and convex surfaces, by coating a platinum (Pt) layer on either the concave surface or the convex surface of the micromotor. In the single-bubble propulsion mode at low fuel concentration, the concave-surface-Pt-coated micromotor moved unexpectedly slower than the convex-surface-Pt-coated micromotor, and the bubble growth on the concave surface was also much slower than that on the convex surface. It was elucidated that the confinement effect of the concave surface hindered fuel replenishment and thus the catalytic reaction. We further introduced the Kelvin impulse to explain why the concave shape eventually weakened the propulsion from hydrodynamic jet flows caused by bubble collapse. In the multi-bubble propulsion mode at high fuel concentration, the interaction among bubbles rendered a "more is less " phenomenon-increase in the fuel concentration did not enhance the maximum instantaneous propulsion speed. These findings inspire the development of new manipulation strategies utilizing the unconventional shape effect in micromotors.
WOS关键词CAVITATION BUBBLES ; JANUS MICROMOTORS
资助项目National Natural Science Foundation of China[11832017] ; National Natural Science Foundation of China[12072350] ; National Natural Science Foundation of China[11972351] ; Chinese Academy of Sciences Key Research Program of Frontier Sciences[QYZDBSSW-JSC036] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB22040403]
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:000745204500003
资助机构National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences
源URL[http://dspace.imech.ac.cn/handle/311007/88390]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Zheng, Xu; Hu, Guoqing
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
3.Zhejiang Univ, Dept Engn Mech, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310027, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Duo,Guan, Dongshi,Su, Jinghong,et al. Distinct dynamics of self-propelled bowl-shaped micromotors caused by shape effect: Concave vs convex[J]. PHYSICS OF FLUIDS,2021,33(12):11.
APA Wang, Duo,Guan, Dongshi,Su, Jinghong,Zheng, Xu,Hu, Guoqing,&Wang D.(2021).Distinct dynamics of self-propelled bowl-shaped micromotors caused by shape effect: Concave vs convex.PHYSICS OF FLUIDS,33(12),11.
MLA Wang, Duo,et al."Distinct dynamics of self-propelled bowl-shaped micromotors caused by shape effect: Concave vs convex".PHYSICS OF FLUIDS 33.12(2021):11.

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来源：力学研究所

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