Exceeding ohmic scaling by more than one order of magnitude with a 3D ion concentration polarization system.

ABSTRACT: 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 zo

SUBMITTER: Chen D 

PROVIDER: S-EPMC9680042 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature