Spinning Janus doublets driven in uniform ac electric fields
Spinning Janus doublets driven in uniform ac electric fields
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DOI：
10.1103/physreve.89.011003
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发表时间：
2014-01-16
影响因子：
2.4
通讯作者：
Miloh, Touvia
中科院分区：
文献类型：
--
作者：
Boymelgreen, Alicia;Yossifon, Gilad;Miloh, Touvia
我们提供了一个强大的，连续旋转的微结构的概念的实验证明，由两个金属电介质（金聚苯乙烯）Janus粒子刚性连接到对方，这是在均匀的交流驱动领域的不对称感应电荷电渗。这些对（双重峰）稳定在平行于观察平面并垂直于所施加电场的方向的基底表面上。我们发现，对的轨道半径和角速度主要取决于金属和电介质半球之间的界面的相对取向和电流体动力学粒子-粒子相互作用是小的。此外，我们验证了这对的角速度和线速度都与所施加的场的平方成正比，这与非线性电动力学理论是一致的。一个简单的运动学刚体模型被用来预测的路径和偶极子速度（角和线性）的基础上，他们的相对取向具有良好的协议。
We provide an experimental proof of concept for a robust, continuously rotating microstructure-consisting of two metallodielectric (gold-polystyrene) Janus particles rigidly attached to each other-which is driven in uniform ac fields by asymmetric induced-charge electro-osmosis. The pairs (doublets) are stabilized on the substrate surface which is parallel to the plane of view and normal to the direction of the applied electric field. We find that the radius of orbit and angular velocity of the pair are predominantly dependent on the relative orientations of the interfaces between the metallic and dielectric hemispheres and that the electrohydrodynamic particle-particle interactions are small. Additionally, we verify that both the angular and linear velocities of the pair are proportional to the square of the applied field which is consistent with the theory for nonlinear electrokinetics. A simple kinematic rigid body model is used to predict the paths and doublet velocities (angular and linear) based on their relative orientations with good agreement.