Alternating current induced-charge electrophoresis of leaky dielectric Janus particles
Alternating current induced-charge electrophoresis of leaky dielectric Janus particles
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DOI：
10.1063/1.4739932
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发表时间：
2012-08-01
影响因子：
4.6
通讯作者：
Miloh, Touvia
中科院分区：
文献类型：
--
作者：
Boymelgreen, Alicia M.;Miloh, Touvia
我们在此提供了一个半解析和数值解的非线性，诱导电荷电泳运动的电非均匀两面球-包括两个半球具有不同的介电常数-在一个均匀的，时变的（交流）电场的应用。没有对双电层（EDL）的大小做任何假设，因此即使在粒子半径与EDL厚度相同数量级的纳米粒子的情况下，分析仍然有效。我们考虑了一些实际和现实的金属半球和电介质半球的结构，并预测了粒子迁移率的变化，作为两个半球和电解质的电导率的函数，外加电场的频率和EDL长度。确定了每个半球的电导率和外加电场的频率存在临界值，当超过临界值时，会导致迁移率迅速衰减到零。(C) 2012年美国物理研究所。[http://dx.doi.org/10.1063/1.4739932]
We hereby provide a semi-analytic and numerical solution for the nonlinear, induced-charge electrophoretic motion of an electrically inhomogeneous Janus sphere-comprising two hemispheres with differing dielectric permittivities-under the application of a uniform, time-dependent (ac) electric field. No assumptions are made regarding the size of the electric double layer (EDL) and thus the analysis remains valid even in the case of nanoparticles where the particle radius can be of the same order as the EDL thickness. We consider a number of practical and realistic configurations of metallic and dielectric hemispheres and predict the variations in particle mobility as a function of the conductivity of the two hemispheres and the electrolyte, the frequency of the applied electric field and the EDL length. It is determined that there exist critical values for the conductivity of each hemisphere and the frequency of the applied field, which when exceeded, can cause the mobility to decay rapidly to zero. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4739932]