Impedance Resonance in Narrow Confinement

Impedance Resonance in Narrow Confinement
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窄约束中的阻抗谐振

DOI:
10.1021/acs.jpcc.8b05559
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发表时间:
2018
期刊:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
H. Löwen
H. Löwen
中科院分区:
--
文献类型:
--
作者:
S. Babel;M. Eikerling;H. Löwen

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本文探讨了电容器配置对交流电压的离子通量响应。该模型系统包括限制在平面平行电容器板之间的对称二元电解质。研究了交流电响应,研究的对象很少,但实际上很重要,即在窄电容装置上施加大幅度电压,两个板之间的距离相当于几个离子直径。采用动态密度泛函理论求解时空离子密度分布以及系统的瞬态离子通量和复阻抗。对这些特性的分析揭示了迄今为止隐藏的阻抗谐振。采用电容器的单离子模拟,相当于忽略离子之间的所有相互作用,用于对此现象的物理解释。它解释了由于场致离子在电容器板处凝聚以及凝聚离子响应场变化的相干运动而产生的共振。
The article explores the ion flux response of a capacitor configuration to an alternating voltage. The model system comprises a symmetric binary electrolyte confined between plan-parallel capacitor plates. The alternating current response is investigated for the sparsely studied albeit practically important case of a large amplitude voltage applied across a narrow capacitive device, with the distance between the two plates amounting to a few ion diameters. Dynamic density functional theory is employed to solve for the spatiotemporal ion density distribution as well as the transient ion flux and complex impedance of the system. The analysis of these properties reveals a hitherto hidden impedance resonance. A single ion analogue of the capacitor, which is equivalent to neglecting all interactions between the ions, is employed for a physical interpretation of this phenomenon. It explains the resonance as a consequence of field-induced ion condensation at the capacitor plates and coherent motion of condensed ions in response to the field variation.
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