Dynamic dielectrophoresis model of multi-phase ionic fluids.
Dynamic dielectrophoresis model of multi-phase ionic fluids.
复制标题
多相离子流体的动态介电泳模型
DOI：
10.1371/journal.pone.0117456
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Wen S
中科院分区：
文献类型：
--
作者：
Yan Y;Luo J;Guo D;Wen S
离子基介电泳微芯片由于其在电动力学和生物学实验中的广泛应用而引起了人们的广泛关注。本文采用数值方法模拟了离子液滴在介质电泳作用下在微通道中的动力学行为。当离散的液体电介质被置于电场中的连续流体电介质包围时，由于介电效应而产生电作用力。如果其中一种或两种流体都是离子液体，则力的大小甚至方向都会发生变化，因为电场诱导的净离子电荷会影响电介质的极化程度。然而，使用介电模型，假设理想的介电介质，结果显着误差。为了避免模型造成的误差，本文引入了电极动力学方程，并定义了极化电荷与净离子电荷之间的关系。根据本文给出的模拟条件，如果不考虑净离子电荷的虚假影响，本工作所得到的电磁力误差超过实际值的70%，这将导致实验参数的设计和优化出现重大问题。因此，有一个明确的动机，开发一个适合于离子液体的模型，为多相离子液体的介电泳提供精确的控制。
Ionic-based dielectrophoretic microchips have attracted significant attention due to their wide-ranging applications in electro kinetic and biological experiments. In this work, a numerical method is used to simulate the dynamic behaviors of ionic droplets in a microchannel under the effect of dielectrophoresis. When a discrete liquid dielectric is encompassed within a continuous fluid dielectric placed in an electric field, an electric force is produced due to the dielectrophoresis effect. If either or both of the fluids are ionic liquids, the magnitude and even the direction of the force will be changed because the net ionic charge induced by an electric field can affect the polarization degree of the dielectrics. However, using a dielectrophoresis model, assuming ideal dielectrics, results in significant errors. To avoid the inaccuracy caused by the model, this work incorporates the electrode kinetic equation and defines a relationship between the polarization charge and the net ionic charge. According to the simulation conditions presented herein, the electric force obtained in this work has an error exceeding 70% of the actual value if the false effect of net ionic charge is not accounted for, which would result in significant issues in the design and optimization of experimental parameters. Therefore, there is a clear motivation for developing a model adapted to ionic liquids to provide precise control for the dielectrophoresis of multi-phase ionic liquids.
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