Exceeding ohmic scaling by more than one order of magnitude with a 3D ion concentration polarization system.
Exceeding ohmic scaling by more than one order of magnitude with a 3D ion concentration polarization system.
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利用3D离子浓差极化系统，超过欧姆缩放一个数量级以上。
DOI：
10.1039/d1lc00470k
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发表时间：
2021-08-21
期刊：
影响因子：
6.1
通讯作者：
中科院分区：
文献类型：
--
作者：
我们报告了一个离子浓度极化（CP）系统，超过欧姆缩放，一个障碍，已经站了四十多年，超过一个数量级。CP用于许多重要的应用，包括微流体系统中痕量分析物的富集和电渗析水净化。已经在很大程度上发现了控制通过这些系统的电流的机制，但是还没有克服由CP离子耗尽区的高电阻引起的电流降低和效率损失。为了获得高电流，将具有微尺度横截面的离子选择性渗透元件与宏观尺度储存器连接。共聚焦荧光显微镜和微粒跟踪测速仪（μ-PTV）用于表征从CP诱导纳米多孔凝胶垂直发射到宏观尺度储层的贫化带。耗尽区的形状和生长以及周围本体溶液中的速度与作为耗尽区形态的驱动器的自然对流一致，并且消除了由1D和2D系统中的耗尽区产生的高阻力。一旦耗尽区的电阻被否定，则假设高电流是由纳米多孔凝胶填充的微通道中的反离子浓度的增强引起的。与传统的系统相比，电流单调增加，并保持稳定在一个高的准稳态水平在报告的系统。这些结果可用于提高利用CP的未来装置的效率和性能，同时证明了利用这种几何形状收集纯化水的能力。
We report an ion concentration polarization (CP) system that exceeds Ohmic scaling, a barrier that has stood for more than four decades, by more than one order of magnitude. CP is used in many important applications, including the enrichment of trace analytes in microfluidic systems and water purification by electrodialysis. The mechanisms that control the current through these systems have been largely discovered, but the reduced currents and loss of efficiency imparted by the high resistance of the CP ion depleted zone have not been overcome. To obtain high currents, an ion permselective element with a microscale cross-section is interfaced with a macroscale reservoir. Confocal fluorescence microscopy and microparticle tracking velocimetry (μ-PTV) are used to characterize the depleted zone that emanates vertically from the CP inducing nanoporous gel into the macroscale reservoir. The shape and growth of depleted zone and velocity in the surrounding bulk solution are consistent with natural convection being the driver of the depleted zone morphology and eliminates the high resistance created by the depleted zone in 1D and 2D systems. Once the resistance of the depleted zone is negated, the high currents are hypothesized to result from enhancement of counter-ion concentration in the nanoporous gel-filled microchannel. In contrast with conventional systems, the current increases monotonically and remains stable at a high quasi-steady level in the reported systems. These results may be used to increase the efficiency and performance of future devices that utilize CP, while the ability to collect purified water with this geometry is demonstrated.
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