Oscillating Electric Fields in Liquids Create a Long-Range Steady Field
Oscillating Electric Fields in Liquids Create a Long-Range Steady Field
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DOI：
10.1103/physrevlett.121.185504
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发表时间：
2018-11-02
影响因子：
8.6
通讯作者：
Miller, Gregory H.
中科院分区：
文献类型：
--
作者：
Amrei, S. M. H. Hashemi;Bukosky, Scott C.;Miller, Gregory H.
我们表明，应用振荡电场的液体产生一个长距离的稳定场，提供的离子有不平等的迁移率。主要的物理是由一个两离子谐振子，产生一个不对称的整流场，其时间平均尺度为所施加的场强的平方说明。完全非线性电动模型的计算证实了双离子模型，并进一步表明，稳定的字段扩展到两个电极之间的大距离。实验测量的微米级胶体悬浮高度随外加频率的变化与数值预测符合雅阁。迄今为止未被怀疑的存在一个长距离的稳定场有助于解释几个长期存在的问题，关于粒子的行为和电诱导流体流动响应振荡电位。
We demonstrate that application of an oscillatory electric field to a liquid yields a long-range steady field, provided the ions present have unequal mobilities. The main physics is illustrated by a two-ion harmonic oscillator, yielding an asymmetric rectified field whose time average scales as the square of the applied field strength. Computations of the fully nonlinear electrokinetic model corroborate the two-ion model and further demonstrate that steady fields extend over large distances between two electrodes. Experimental measurements of the levitation height of micron-scale colloids versus applied frequency accord with the numerical predictions. The heretofore unsuspected existence of a long-range steady field helps explain several long-standing questions regarding the behavior of particles and electrically induced fluid flows in response to oscillatory potentials.