Two differet self-propulsion types of Janus microspheres: from the comparative experiments and driving mechanisms
文献类型：期刊论文
| 作者 | 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)
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| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2016 |
| 卷号 | 65期号:22页码:220201 |
| 通讯作者邮箱 | cuihaihang@xauat.edu.cn |
| 关键词 | Janus microsphere self-diffusiophoresis bubble self-propulsion slip boundary |
| ISSN号 | 1000-3290 |
| 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 |
| 通讯作者 | Cui, HH (reprint author), Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian 710055, 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 |
| 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. |
入库方式： OAI收割
来源：力学研究所
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