Rectified Ion Transport in Ultra‐thin Membrane Governed by Outer Membrane Electric Double Layer,Chinese Journal of Chemistry

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Rectified Ion Transport in Ultra‐thin Membrane Governed by Outer Membrane Electric Double Layer
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-05-24 , DOI: 10.1002/cjoc.202000066
Zhenkun Zhang ₁ , Chao Wang ₁ , Lingxin Lin ₁ , Mengyi Xu ₁ , Yichun Wu ₁ , Liuxuan Cao ₁

Affiliation

The outstanding combination of selectivity and permeability observed in ultra‐thin nanoporous membranes attracts broad interest from both fundamental research and practical application aspects. It is reported that the asymmetrical ion transport can be realized through the modification of polyelectrolytes on the outer membranes surface. However, the related mechanisms are still unclear which hinders their applications. Herein, we systematically investigate the origin of the ion current rectification in heterogeneously charged ultra‐thin nanopores. The calculated results based on the continuity model suggest that, the ion transport across the ultra‐thin membrane is dominated by the charge on the outer membrane surface rather than the pore wall. The overlap of electric double layer outside the pore entrance is essential for the ion asymmetric transport. And it accordingly results in the fact that the ion concentration enrichment and depletion effect occurring outside the nanopore orifices governs the high and low ionic conductance states under the applied bias. These features can be regulated by the membrane surface state, which is truly attractive because the surfaces of the outer membrane can be easily modified by experimental approaches. These findings provide the renew inspiration for the design of high‐performance 2D nanofluidic devices.

中文翻译：

由外膜双电层控制的超薄膜中的整流离子传输

在超薄纳米多孔膜中观察到的选择性和渗透性的出色结合引起了基础研究和实际应用方面的广泛兴趣。据报道，可以通过外膜表面上的聚电解质的改性来实现不对称离子的传输。但是，相关机制尚不清楚，这阻碍了它们的应用。在此，我们系统地研究了异质电荷超薄纳米孔中离子电流整流的起源。基于连续性模型的计算结果表明，跨超薄膜的离子传输主要是由外膜表面而非孔壁上的电荷决定的。电双层在孔入口外的重叠对于离子不对称传输至关重要。因此，其结果是，在施加的偏压下，发生在纳米孔口外部的离子浓度富集和耗尽效应决定了高和低离子电导率状态。这些特征可以通过膜表面状态来调节，这是真正吸引人的，因为外膜的表面可以通过实验方法轻松地进行修饰。这些发现为高性能2D纳米流体设备的设计提供了新的灵感。这些特征可以通过膜表面状态来调节，这是真正吸引人的，因为外膜的表面可以通过实验方法轻松地进行修饰。这些发现为高性能2D纳米流体设备的设计提供了新的灵感。这些特征可以通过膜表面状态来调节，这是真正吸引人的，因为外膜的表面可以通过实验方法轻松地进行修饰。这些发现为高性能2D纳米流体设备的设计提供了新的灵感。

更新日期：2020-05-24

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