帮助 关于我们

返回检索结果

气泡推进型中空Janus微球运动特性的实验研究
Experimental study on the characteristic motion of bubble propelled hollow Janus microspheres

查看参考文献15篇

张静 1   郑旭 2 *   王雷磊 1   崔海航 1   李战华 2  
文摘 本文通过Pt-SiO_2型(铂-二氧化硅型)中空Janus微球在低浓度2%~4% H_2O_2溶液中的气泡驱动实验,观察到在每个气泡生长-溃灭周期内,Janus微球的运动呈现3个特征阶段,分别为自扩散泳、气泡生长和气泡溃灭。其中气泡溃灭阶段微球在射流驱动下的推进速度可达每秒几十毫米,比前2个阶段的平均速度大2~3个数量级。实验观察到气泡生长阶段其半径与时间存在R_b~t~(1/3)和R_b~t~(1/2)两种标度率。由于气泡在Janus微球催化剂表面(Pt侧)的生长点偏离对称轴位置,Janus微球的运动轨迹呈圆周形。随H_2O_2溶液浓度的增加,还可以进一步提高Janus微球的运动速度。此研究不仅定量分析了Janus微球的运动特性,而且为实际应用中提高Janus双面微马达的运动速度和能量利用率提供了参考依据。
其他语种文摘 This paper studies the bubble propelled motion of Pt-SiO_2 hollow Janus microspheres in H_2O_2 solutions (concentrations between 2% to 4%). Three typical stages have been observed in every period of the bubble growth-collapse, which are self-diffusiophoresis, bubble growth and bubble collapse. At the bubble collapse stage, the speed propelled by a microjet can reach tens of millimeter per second, and it is about 2 or 3 orders of magnitude higher than the speed in the other two stages. In the experiment, two scaling laws between the bubble radius and the elapsed time during the bubble growth stage are observed: R_b~t~(1/3) and R_b~t~(1/2). Because the bubble growing point at the Janus microsphere's Pt side deviates from the axisymmetric point, the trajectory of the Janus microsphere is nearly a circle.With the increase of the H_2O_2 concentrations, the speed of the Janus microspheres can be enhanced.This study not only quantifies the characteristic motion of Janus microspheres, but also provides valuable information for improving the speed and energy utilization of Janus micromotors in practical application.
来源 实验流体力学 ,2017,31(2):61-66 【核心库】
DOI 10.11729/syltlx20160152
关键词 中空Janus微球 ; 气泡驱动 ; 气泡溃灭
地址

1. 西安建筑科技大学环境与市政工程学院, 西安, 710055  

2. 中国科学院力学研究所, 北京, 100190

语种 中文
文献类型 研究性论文
ISSN 1672-9897
学科 力学
基金 国家自然科学基金 ;  陕西省教育厅重点实验室科研项目
文献收藏号 CSCD:5983258

参考文献 共 15 共1页

1.  Gennes P G D. Soft matter (nobel lecture). Angewandte Chemie International Edition,1992,31(7):842-845 被引 31    
2.  Chernyak V G. Diffusiophoresis of an aerosol particle in a binary gas mixture. Journal of Applied Mechanics & Technical Physics,2001,42(3):445-454 被引 6    
3.  Howse J R. Self-motile colloidal particles: from directed propulsion to random walk. Physical Review Letters,2007,99(4):048102 被引 37    
4.  武美玲. Janus颗粒有效扩散系数的实验研究. 水动力学研究与进展,2014,29(3):274-281 被引 4    
5.  Liu Z. Small-scale heat detection using catalytic microengines irradiated by laser. Nanoscale,2013,5(4):1345-1352 被引 4    
6.  Brenner H. A continuum approach to phoretic motions: thermophoresis. Physica a Statistical Mechanics & its Applications,2005,355(355):251-273 被引 2    
7.  Wu Z. Near-infrared light-triggered "on/off" motion of polymer multilayer rockets. Acs Nano,2014,8(6):6097-6105 被引 8    
8.  Wu M. Simulation of diffusiophoresis force and the confinement effect of Janus particles with the continuum method. Aip Advances,2014,4(3):32-33 被引 1    
9.  Wang S. Selecting the swimming mechanisms of colloidal particles: bubble propulsion versus self-diffusiophoresis. Langmuir,2014,30(12):3477-3486 被引 3    
10.  Magdanz V. Tubular micromotors: from microjets to spermbots. Robotics & Biomimetics,2014,1(1):1-10 被引 1    
11.  Manjare M. Bubble driven quasioscillatory translational motion of catalytic micromotors. Physical Review Letters,2012,109(12):128305 被引 9    
12.  Jurado-Sanchez B. Self-propelled activated carbon janus micromotors for efficient water purification. Small,2015,11(4):499-506 被引 15    
13.  Soler L. Self-propelled micromotors for cleaning polluted water. Acs Nano,2013,7(11):9611-9620 被引 14    
14.  Zheng X. Non-Gaussian statistics for the motion of self-propelled Janus particles: experiment versus theory. Physical Review E,2013,88(3/1):3772-3774 被引 1    
15.  Marqusee J A. Theory of ostwald ripening: competitive growth and its dependence on volume fraction. Journal of Chemical Physics,1983,80(1):536-543 被引 9    
引证文献 3

1 魏梦举 微尺度空泡溃灭驱使微球运动的机理研究 物理学报,2017,66(16):164702-1-164702-9
被引 2

2 闫聪聪 微气泡生长与溃灭对邻近微球影响的数值模拟研究 应用力学学报,2019,36(3):580-587
被引 0 次

显示所有3篇文献

论文科学数据集
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

版权所有 ©2008 中国科学院文献情报中心 制作维护:中国科学院文献情报中心
地址:北京中关村北四环西路33号 邮政编码:100190 联系电话:(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号