关于固态纳米孔中的诱导表面电荷。,Langmuir

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关于固态纳米孔中的诱导表面电荷。
Langmuir ( IF 3.7 ) Pub Date : 2020-07-09 , DOI: 10.1021/acs.langmuir.0c01189
Yao Yao ₁ , Chenyu Wen ₁ , Ngan H Pham ₁ , Shi-Li Zhang ₁

Affiliation

固态纳米孔构成了研究纳米约束中离子迁移的通用平台。双电层（EDL）在此类纳米约束中起着至关重要的作用，但是在存在外部跨膜电场的情况下，感应表面电荷对EDL的影响尚待鉴定。在这里，使用固态截短的金字塔形纳米孔的新型实验装置，阐明了在纳米孔侧壁表面上感应电荷的形成及其通过EDL和电渗流的调节对离子电流的影响。这项研究包括三种互补的方法，即。Ë，感应表面电荷的分析模型，感应表面电荷，电渗流和离子电流的数值模拟，以及关于离子电流的实验验证。感应的表面电荷是由电介质膜的极化产生的，作为对施加电场的响应。这种电荷产生导致沿纳米孔侧壁的表面电荷密度不均匀。它进一步导致电解质中的离子重新分布，从而导致EDL及其反离子在纳米孔较小开口附近大量积聚。它还改变了纳米孔中的电流体动力学性质，导致在纳米孔的较小开口附近形成电渗涡流。最后，

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On Induced Surface Charge in Solid-State Nanopores.

Solid-state nanopores constitute a versatile platform for study of ion transport in nanoconfinement. The electrical double layer (EDL) plays a vital role in such nanoconfinements, but effects of induced surface charge on the EDL in the presence of an external transmembrane electric field are yet to be characterized. Here, the formation of induced charge on the nanopore sidewall surface and its effects, via modulation of the EDL and electroosmotic flow, on the ionic current are elucidated using a novel experimental setup with solid-state truncated-pyramidal nanopores. This study consists of three complementary approaches, i.e., an analytical model for induced surface charge, numerical simulation of induced surface charge, electroosmotic flow, and ionic current, and experimental validation with respect to the ionic current. The induced surface charge is generated by polarization in the dielectric membrane as a response to the applied electric field. This charge generation results in a nonuniform density of surface charge along the nanopore sidewall. It further causes ions in the electrolyte to redistribute, leading to a massive accumulation of single-polarity ions in the EDL and their counterions near the smaller opening of the nanopore. It also alters electrohydrodynamic properties in the nanopore, giving rise to the formation of electroosmotic vortexes in the vicinity of the smaller opening of the nanopore. Finally, the pattern of the electroosmotic flow can significantly influence the transport properties of the nanopore.

更新日期：2020-08-04

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