Iterative dipole moment method for the interaction of multiple dielectrophoretic particles in an AC electrical field
Iterative dipole moment method for the interaction of multiple dielectrophoretic particles in an AC electrical field
复制标题
交流电场中多个介电泳粒子相互作用的迭代偶极矩法
DOI：
10.1016/j.euromechflu.2016.03.003
复制
发表时间：
2016-07-01
影响因子：
2.6
通讯作者：
Wu, Jiankang
中科院分区：
文献类型：
--
作者：
Xie, Chuanchuan;Chen, Bo;Wu, Jiankang
近年来，用于生物颗粒操纵的介电电泳（DEP）引起了广泛关注。等效偶极矩法 (EDM) 已广泛用于计算单个粒子上的 DEP 力，但该方法不足以描述相邻粒子之间的相互作用。麦克斯韦应力张量法（MST）对于粒子相互作用在理论上是严格的，但其复杂的数值计算使其在实际中难以实现。在本文中，提出了一种迭代偶极矩方法（IDM）来研究二维交流电场中多个介电泳粒子的相互作用。一些已发表的结果和实验观察发现，无需繁琐的数值计算，IDM方法计算的粒子间力、粒子轨迹和链模式与MST方法的结果非常一致。此外，发现最终稳定的颗粒链模式很大程度上取决于颗粒分布的初始配置。对粒子位置的任意小干扰可能会导致运动轨迹和最终粒子链显着不同。通过调节交流场的频率，粒子可以在正 DEP 粒子和负 DEP 粒子之间转换，从而产生不同的粒子链。 (C) 2016 Elsevier Masson SAS。版权所有。
Dielectrophoresis (DEP) for bio-particle manipulation has been drawing much attention in recent years. The equivalent dipole moment method (EDM) has widely been used to calculate DEP forces on single particle, but this method falls short to describe the interaction between neighboring particles. The Maxwell stress tensor method (MST) is theoretically rigorous for particle interaction, but its complicated numerical computation makes it difficult to implement in practice. In this paper, an iterative dipole moment method (IDM) is presented to investigate the interaction of multiple dielectrophoretic particles in a two-dimensional AC electric field. Without cumbersome numerical computation, the inter-particle forces, the particle trajectories and chain patterns calculated by the IDM method are found to be well consistent with those by the MST method for some published results and experimental observations. Furthermore, it is found that the final stable particle chain patterns strongly depend on the initial configuration of the particle distribution. An arbitrary small disturbance to the particle locations may lead to dramatically different motion trajectories and final particle chains. By tuning the frequency of AC field, the particles can be transformed between positive DEP particles and negative DEP particles, which results in different particle chains as well. (C) 2016 Elsevier Masson SAS. All rights reserved.