Enhancement of Overlimiting Current in a Three-Dimensional Hierarchical Micro/Nanofluidic System by Non-uniform Compartmentalization

IF 5.5 3区 工程技术 Q1 BIOCHEMICAL RESEARCH METHODS
Hyungjoo Park, Misun Kim, Seunghyun Kang, Taewan Kim, Sehyuk Yoon, Jihee Park, Sungjae Ha, Sung Jae Kim
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Abstract

Overlimiting current (OLC) is a non-linear current response that occurs related to an ion concentration polarization (ICP) phenomenon in micro/nanofluidic systems and holds great importance since it represents the rate of selective ion transportation through perm-selective structure. For last two decades, numerous studies of OLC have been reported about understanding the fundamentals of nanoelectrokinetics and enhancing ion transportation through perm-selective membranes. Recent study reported that the alignment of non-uniform microspace near the perm-selective membranes in two-dimensional micro/nanofluidic systems can significantly enhance OLC, i.e., overlimiting conductance (σOLC). This is attributed to recirculation flow induced by combination of unbalanced electroosmosis and induced pressure driven flow among non-uniform microspaces. However, 2D micro/nanofluidic systems have limited practicality due to their small volume and low throughput. Herein, we tested the OLC enhancement using 3D-printed hierarchical micro/nanofluidic systems with respect to the non-uniformity of microspaces. The 3D microspaces were fabricated as a mesh structure using a conventional 3D printer. By comparing current–voltage measurement with each type of mesh, we experimentally confirmed the generation of recirculation flow among non-uniform meshes and ionic current enhancement in 3D hierarchical micro/nanofluidic system. Also, we further investigated the enhancement of overlimiting conductance depending on the mesh pattern. Furthermore, we validated that this effect of microscale non-uniform compartmentalization, both increasing surface area and aligning non-uniform spaces, appears not only at low molar concentration but at high molar concentrations. This demonstration can offer a strategy to design optimal electrochemical systems where a perm-selective ion transportation is crucial.

Abstract Image

通过非均匀区隔增强三维分层微/纳流体系统中的超限电流
超限电流(OLC)是微/纳流控系统中与离子浓度极化(ICP)现象相关的一种非线性电流响应,由于它代表了离子通过过选择性结构的选择性传输速率,因此具有非常重要的意义。在过去的二十年里,关于 OLC 的大量研究都是为了了解纳米电动力学的基本原理以及增强离子通过烫发选择性膜的传输。最近的研究报告指出,在二维微/纳米流体系统中,靠近烫发选择膜的非均匀微空间的排列可显著增强 OLC,即超限电导(σOLC)。这归因于不平衡电渗和非均匀微空间之间的诱导压力驱动流动共同诱发的再循环流动。然而,二维微/纳流控系统由于体积小、吞吐量低,实用性有限。在此,我们测试了使用三维打印分层微/纳流体系统对微空间不均匀性的 OLC 增强效果。三维微空间是用传统三维打印机制造的网状结构。通过比较每种网状结构的电流-电压测量值,我们通过实验证实了非均匀网状结构之间的再循环流动以及三维分层微/纳流体系统中离子电流的增强。此外,我们还进一步研究了超限电导的增强取决于网格模式。此外,我们还验证了这种微尺度非均匀分隔效应,即增加表面积和排列非均匀空间,不仅出现在低摩尔浓度下,而且出现在高摩尔浓度下。这一论证为设计最佳电化学系统提供了一种策略,在这种系统中,离子的永久选择性传输至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
BioChip Journal
BioChip Journal 生物-生化研究方法
CiteScore
7.70
自引率
16.30%
发文量
47
审稿时长
6-12 weeks
期刊介绍: BioChip Journal publishes original research and reviews in all areas of the biochip technology in the following disciplines, including protein chip, DNA chip, cell chip, lab-on-a-chip, bio-MEMS, biosensor, micro/nano mechanics, microfluidics, high-throughput screening technology, medical science, genomics, proteomics, bioinformatics, medical diagnostics, environmental monitoring and micro/nanotechnology. The Journal is committed to rapid peer review to ensure the publication of highest quality original research and timely news and review articles.
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