Interface evolution mechanism of dual-bubble coalescence driving micromotors in bulk phase

doi:10.7498/aps.72.20230608

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

	Interface evolution mechanism of dual-bubble coalescence driving micromotors in bulk phase
	Wang Li-Na 2; Chen Li 2; Sheng Min-Jia 2; Wang Lei-Lei 1; Cui Hai-Hang 2; Zheng Xu 1; Huang Ming-Hua 2
刊名	ACTA PHYSICA SINICA
	2023-08-20
卷号	72 期号:16 页码:11
关键词	dual bubble coalescence micromotor interface energy pseudo potential lattice Boltzmann method
ISSN号	1000-3290
DOI	10.7498/aps.72.20230608
通讯作者	Chen Li(jasonchencl@163.com) ; Zheng Xu(zhengxu@lnm.imech.ac.cn)
英文摘要	Self-propelled micromotor serves as a bridge between the microfluidic environment and macroscopic control. It has broad application prospects in targeted drug delivery, biosensors, and other fields. The high driving speed of bubble micromotor is an irreplaceable advantage in practical applications. Bubble micromotor converts chemical energy in ambient solutions into mechanical energy through asymmetric surface catalytic reactions to drive its own motion. The energy conversion rate of bubble driving is used as an indicator to evaluate the driving force. The Pt catalytic layer of a tubular micromotor is located on the inner wall of the microtube. Bubbles form inside the tube. They are released from one end of the microtubule into the solution and self driven by bubble rebound, with an energy conversion rate of similar to 10(-10). The Janus microsphere motor near the gas-liquid interface utilizes the energy of the bubble coalesced with the interface to drive the microsphere, with an energy conversion rate of similar to 10(-7). In sum, the tubular bubble motor is suitable for complex scenarios but has a low energy conversion rate. The Janus microsphere motor driven by bubbles has a high efficiency but is only suitable near the gas-liquid interface. This paper combines the advantages of driving tubular micromotors in bulk solution and Janus microsphere motors which can be driven efficiently by interface energy, proposes a new method of driving Janus microsphere motors by dual bubble coalescence. In the experiment, a high-speed camera is used to record the similar to 100 mu s of dual bubble coalescence and the process of driving micromotor. Then we investigate the initial kinetic energy conversion rate of micro motor driven by bubble coalescence. Three sets of different bubble/particle size ratios of R-b/R-p < 1 R-b/R-p approximate to 1, R-b/R-p > 1 are adopted for their propulsion effects on microspheres. The initial kinetic energy conversion rate is defined to characterize the contribution of bubble coalescence process to microsphere driving. After simulations with the pseudo potential lattice Boltzmann method, the mechanism of bubble coalescence driving the motion of microspheres is revealed. It is clarified that the interface oscillation caused by bubble coalescence is the main reason of driving the micromotor, and its energy conversion rate is between the rebound driving of the tubular micromotor and the one-bubble coalescence driving with the free surface. The research results reveal the details of bubble coalescence at different time periods, and provide the effects of factors such as bubble particle size ratio on microsphere displacement and initial kinetic energy conversion rate. Thus the efficient driving mechanism of dual bubble coalescence and release of surface energy are confirmed.
资助项目	Natural Science Basic Research Program General Program of Shaanxi Province, China[2020JM-479] ; China Postdoctoral Science Foundation[2022M720148] ; National Natural Science Foundation of China[52208126]
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:001088237000018
资助机构	Natural Science Basic Research Program General Program of Shaanxi Province, China ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/93255]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Chen Li; Zheng Xu
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Xian Univ Architecture & Technol, Sch Bldg Serv Sci & Engn, Xian 710055, Peoples R China
推荐引用方式 GB/T 7714	Wang Li-Na,Chen Li,Sheng Min-Jia,et al. Interface evolution mechanism of dual-bubble coalescence driving micromotors in bulk phase[J]. ACTA PHYSICA SINICA,2023,72(16):11.
APA	Wang Li-Na.,Chen Li.,Sheng Min-Jia.,Wang Lei-Lei.,Cui Hai-Hang.,...&Huang Ming-Hua.(2023).Interface evolution mechanism of dual-bubble coalescence driving micromotors in bulk phase.ACTA PHYSICA SINICA,72(16),11.
MLA	Wang Li-Na,et al."Interface evolution mechanism of dual-bubble coalescence driving micromotors in bulk phase".ACTA PHYSICA SINICA 72.16(2023):11.