Two differet self-propulsion types of Janus microspheres: from the comparative experiments and driving mechanisms

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	Two differet self-propulsion types of Janus microspheres: from the comparative experiments and driving mechanisms
	Wang LL; Cui HH; Jing Z; Xu Z; Lei W; Li C; Cui HH(崔海航); Chen L(陈力); Chen L(陈力); Zheng X(郑旭)
刊名	ACTA PHYSICA SINICA
	2016
通讯作者邮箱	cuihaihang@xauat.edu.cn
卷号	65 期号:22 页码:220201
关键词	Janus microsphere self-diffusiophoresis bubble self-propulsion slip boundary
ISSN号	1000-3290
通讯作者	Cui, HH (reprint author), Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian 710055, Peoples R China.
产权排序	[Wang Lei-Lei; Cui Hai-Hang; Jing, Zhang; Lei, Wang; Li, Chen] Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian 710055, Peoples R China; [Xu, Zheng] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
中文摘要	A Janus particle is a general term for a non-uniform particle that has different properties on different sides of particle. For a Pt-SiO2 type of Janus microsphere, Pt side serves as the catalysis surface to decompose H2O2 solution, leading to the self-propulsion motion of particle. In this paper, the relevant experimental phenomena in two driven modes are compared first. The results show that under the same concentration of solution, the microsphere with a diameter of about 1 mu m experiences self-diffusiophoresis propulsion; whereas, the one with an about 20 mu m diameter experiences bubble self-propulsion. Significant differences in motional trajectory and propulsion velocity are found between them. Then, the dominated physical factors are analyzed and the multi-field coupling numerical model is constructed based on the simplified force balance analysis. Subsequently, the velocity field distribution and O-2 concentration distribution around Janus microsphere are also studied. According to these studies, we explain the position and size of the bubble generated. Further more, we infer that the wall slip coefficient is a key matching parameter in the numerical model, and two slip coefficients with a difference of an order of magnitude are given corresponding to the two types of self-propulsion modes. Then we explain the possible mechanism for the changes of wall slip coefficient under different particle sizes. The present study is beneficial to the in-depth exploration of the self-propulsion mechanism and also provides the theoretical foundation for improving the performance of self-propellant device.
分类号	Q4
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	Janus microsphere ; self-diffusiophoresis ; bubble self-propulsion ; slip boundary
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.7498/aps.65.220201
语种	英语
WOS记录号	WOS:000389598500001
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/59983]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Wang LL,Cui HH,Jing Z,et al. Two differet self-propulsion types of Janus microspheres: from the comparative experiments and driving mechanisms[J]. ACTA PHYSICA SINICA,2016,65(22):220201.
APA	Wang LL.,Cui HH.,Jing Z.,Xu Z.,Lei W.,...&郑旭.(2016).Two differet self-propulsion types of Janus microspheres: from the comparative experiments and driving mechanisms.ACTA PHYSICA SINICA,65(22),220201.
MLA	Wang LL,et al."Two differet self-propulsion types of Janus microspheres: from the comparative experiments and driving mechanisms".ACTA PHYSICA SINICA 65.22(2016):220201.