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Alternative TitleTwo differet self-propulsion types of Janus microspheres: from the comparative experiments and driving mechanisms
王雷磊1; 崔海航1; 张静1; 郑旭2; 王磊1; 陈力1; Cui, HH (reprint author), Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian 710055, Peoples R China.
Source Publication物理学报/ACTA PHYSICA SINICA
Other Abstract



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.

KeywordJanus微球 扩散泳 Self-diffusiophoresis 气泡驱动 Bubble Self-propulsion 滑移边界 Slip Boundary Janus Microsphere
Indexed BySCI ; EI ; CSCD
WOS IDWOS:000389598500001
WOS KeywordJanus microsphere ; self-diffusiophoresis ; bubble self-propulsion ; slip boundary
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
Funding OrganizationSpecial Research Project of Shaanxi Educational Committee, China [15JS045] ; National Natural Science Foundation of China [11602187]
Citation statistics
Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
Corresponding AuthorCui, HH (reprint author), Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian 710055, Peoples R China.
Recommended Citation
GB/T 7714
王雷磊,崔海航,张静,等. 不同粒径Janus微球的自驱动:实验及驱动机制对比[J]. 物理学报/ACTA PHYSICA SINICA,2016,65(22):220201.
APA 王雷磊.,崔海航.,张静.,郑旭.,王磊.,...&Cui, HH .(2016).不同粒径Janus微球的自驱动:实验及驱动机制对比.物理学报/ACTA PHYSICA SINICA,65(22),220201.
MLA 王雷磊,et al."不同粒径Janus微球的自驱动:实验及驱动机制对比".物理学报/ACTA PHYSICA SINICA 65.22(2016):220201.
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