Three-Dimensional Interaction of a Large Number of Dense DEP Particles on a Plane Perpendicular to an AC Electrical Field
Three-Dimensional Interaction of a Large Number of Dense DEP Particles on a Plane Perpendicular to an AC Electrical Field
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垂直于交流电场的平面上大量致密 DEP 粒子的三维相互作用
DOI：
10.3390/mi8010026
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发表时间：
2017-01-20
期刊：
影响因子：
3.4
通讯作者：
Wu J
中科院分区：
文献类型：
--
作者：
Xie C;Chen B;Wu J
许多实验都观察到介电电泳 (DEP) 粒子在电场中的相互作用，称为“粒子链现象”。然而，由于 3D 模型（球形粒子）的复杂性和巨大的计算成本，其研究很少被报道。在本文中，我们采用迭代偶极矩（IDM）方法来研究在有界或无界空间中随机分布在垂直于均匀交流（AC）电场的平面上的大量致密DEP粒子的3D相互作用。数值结果表明粒子不能移出初始平面。相似的粒子（无论是全正的还是全负的DEP粒子）总是相互排斥，并且不形成链。不同种粒子（正负DEP粒子的混合物）总是相互吸引，并形成由正负DEP粒子交替排列组成的粒子链。取决于初始颗粒分布、颗粒/流体的电特性、颗粒尺寸和颗粒数量，颗粒链图案可以是随机的大量。研究还发现，通过调节交流场的频率可以有效地操纵颗粒链图案，并且当所有颗粒相似时，可以在有界平面芯片中实现颗粒几乎均匀的分布，这可能在微流控的颗粒操纵中具有潜在的应用。
The interaction of dielectrophoresis (DEP) particles in an electric field has been observed in many experiments, known as the “particle chains phenomenon”. However, the study in 3D models (spherical particles) is rarely reported due to its complexity and significant computational cost. In this paper, we employed the iterative dipole moment (IDM) method to study the 3D interaction of a large number of dense DEP particles randomly distributed on a plane perpendicular to a uniform alternating current (AC) electric field in a bounded or unbounded space. The numerical results indicated that the particles cannot move out of the initial plane. The similar particles (either all positive or all negative DEP particles) always repelled each other, and did not form a chain. The dissimilar particles (a mixture of positive and negative DEP particles) always attracted each other, and formed particle chains consisting of alternately arranged positive and negative DEP particles. The particle chain patterns can be randomly multitudinous depending on the initial particle distribution, the electric properties of particles/fluid, the particle sizes and the number of particles. It is also found that the particle chain patterns can be effectively manipulated via tuning the frequency of the AC field and an almost uniform distribution of particles in a bounded plane chip can be achieved when all of the particles are similar, which may have potential applications in the particle manipulation of microfluidics.
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