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arXiv 1105.0249cond-mat.softphysics.chem-ph
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两种电解质界面的非平衡双电层

Non-equilibrium electric double layers at the interface between two electrolytes

Steffen Hardt, Tobias Baier

摘要:

在两种电解质之间的界面处的电荷分布的情况下,非零离子通量进行了研究。该分析是一个扩展的建立Verwey-Niessen理论的非平衡状态。应用匹配的渐近展开的双电层和散装电解质的区域,离子浓度和静电势的解析表达式推导。发现双电层令人惊讶地稳定。即使在所施加的电场如此强以至于完全抵消界面处的电荷云的场的情况下,也会形成两个相对的空间电荷区域。这种现象定性地解释了使用一个简单的模型,将离子分配和扩散离子运输。另一个值得注意的现象是,界面在施加电场的情况下获得净电荷,这与界面流的流体动力学稳定性有关。

英文摘要:

The charge distribution at the interface between two electrolytes is studied for the case of non-vanishing ion fluxes. The analysis is an extension of the established Verwey-Niessen theory to non-equilibrium situations. Applying matched asymptotic expansions for the region of the electric double layer and the bulk electrolytes, analytical expressions for the ion concentrations and the electrostatic potential are derived. It is found that the electric double layer is surprisingly stable. Even in cases where the applied electric field is so strong that it completely cancels the field of the charge clouds at the interface, two opposing space charge regions are formed. This phenomenon is qualitatively explained using a simple model incorporating ion partitioning and diffusive ion transport. Another notable phenomenon is that the interface acquires a net charge in the presence of an applied electric field, being of relevance for the hydrodynamic stability of interfacial flows.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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