Distinct dynamics of self-propelled bowl-shaped micromotors caused by shape effect: Concave vs convex | |
Wang, Duo1,2,3; Guan, Dongshi2,3; Su, Jinghong1,2,3; Zheng, Xu2; Hu, Guoqing1 | |
发表期刊 | PHYSICS OF FLUIDS |
2021-12-01 | |
卷号 | 33期号:12页码:11 |
ISSN | 1070-6631 |
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. |
DOI | 10.1063/5.0076060 |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000745204500003 |
关键词[WOS] | CAVITATION BUBBLES ; JANUS MICROMOTORS |
WOS研究方向 | Mechanics ; Physics |
WOS类目 | Mechanics ; Physics, Fluids & Plasmas |
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] |
项目资助者 | 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 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/88391 |
专题 | 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.Zhejiang Univ, Dept Engn Mech, State Key Lab Fluid Power & Mechatron Syst, Hangzhou 310027, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, 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.(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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