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

doi:10.1063/5.0076060

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Distinct dynamics of self-propelled bowl-shaped micromotors caused by shape effect: Concave vs convex
	Wang, Duo 1,2,3; Guan, Dongshi 1,2; Su, Jinghong 1,2,3; Zheng, Xu 2; Hu, Guoqing 3
刊名	PHYSICS OF FLUIDS
	2021-12-01
卷号	33 期号:12 页码:11
ISSN号	1070-6631
DOI	10.1063/5.0076060
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.
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关键词	CAVITATION BUBBLES ; JANUS MICROMOTORS
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
内容类型	期刊论文
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.(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.