不同粒径Janus微球的自驱动:实验及驱动机制对比
发布时间：2018-07-22 19:40
【摘要】：Janus颗粒是两侧具有不同性质的非均质颗粒的统称.利用Pt-SiO2型Janus微球的Pt一侧催化分解H_2O_2溶液,可以使得颗粒自驱运动.本文首先从实验角度对比了不同粒径、相同浓度下的两类自驱动现象,结果表明在d～O(1μm)时为扩散泳驱动,d～O(10μm)为气泡驱动,二者在运动轨迹、驱动速度上存在很大差异.随后,分析了主导的力学因素,并根据简化后的受力平衡关系建立了多场耦合的数值模型,重点研究了大粒径下浓度及速度场的分布,据此解释了气泡产生的位置及尺寸,并推断壁面滑移系数是数值模型中的关键匹配参数,及其在不同粒径下变化的可能机理.这一研究将为深入理解自驱动的机理及提高自驱动器件的驱动能力提供理论基础.
[Abstract]:Janus particle is a general term for heterogeneous particles with different properties on both sides. Using Pt side of Pt-SiO _ 2 Janus microspheres to catalyze decomposition of H _ s _ 2 _ 2O _ 2 solution can make the particles self-drive motion. In this paper, two kinds of self-driving phenomena with different particle size and the same concentration are compared from the experimental point of view. The results show that the diffusion dimmer (10 渭 m) is the bubble driven at danao (1 渭 m), and there is a great difference between them in the motion trajectory and the driving speed. Then, the dominant mechanical factors are analyzed, and the numerical model of multi-field coupling is established according to the simplified force balance relationship. The distribution of concentration and velocity field under large particle size is studied, and the position and size of bubble are explained. It is inferred that the wall slip coefficient is the key matching parameter in the numerical model and the possible mechanism of its variation under different particle sizes. This study will provide a theoretical basis for further understanding the mechanism of self-driving and improving the driving capability of self-actuated devices.
【作者单位】： 西安建筑科技大学环境与市政工程学院;中国科学院力学研究所 非线性力学国家重点实验室;
【基金】：陕西省教育厅重点实验室项目(批准号:15JS045) 国家自然科学基金(批准号:11602187)资助的课题~~
【分类号】：O35
本文编号：2138359
[Abstract]:Janus particle is a general term for heterogeneous particles with different properties on both sides. Using Pt side of Pt-SiO _ 2 Janus microspheres to catalyze decomposition of H _ s _ 2 _ 2O _ 2 solution can make the particles self-drive motion. In this paper, two kinds of self-driving phenomena with different particle size and the same concentration are compared from the experimental point of view. The results show that the diffusion dimmer (10 渭 m) is the bubble driven at danao (1 渭 m), and there is a great difference between them in the motion trajectory and the driving speed. Then, the dominant mechanical factors are analyzed, and the numerical model of multi-field coupling is established according to the simplified force balance relationship. The distribution of concentration and velocity field under large particle size is studied, and the position and size of bubble are explained. It is inferred that the wall slip coefficient is the key matching parameter in the numerical model and the possible mechanism of its variation under different particle sizes. This study will provide a theoretical basis for further understanding the mechanism of self-driving and improving the driving capability of self-actuated devices.
【作者单位】： 西安建筑科技大学环境与市政工程学院;中国科学院力学研究所 非线性力学国家重点实验室;
【基金】：陕西省教育厅重点实验室项目(批准号:15JS045) 国家自然科学基金(批准号:11602187)资助的课题~~
【分类号】：O35
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