Ion current rectification in funnel-shaped nanochannels: Hysteresis and inversion effects,The Journal of Chemical Physics

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Ion current rectification in funnel-shaped nanochannels: Hysteresis and inversion effects
The Journal of Chemical Physics ( IF 3.1 ) Pub Date : 2015-12-10 14:41:10 , DOI: 10.1063/1.4936915
Leon Rosentsvit ₁ , Wei Wang ₂ , Jarrod Schiffbauer ₁ , Hsueh-Chia Chang ₃ , Gilad Yossifon ₁

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Ion current rectification inversion is observed in a funnel-shaped nanochannel above a threshold voltage roughly corresponding to the under-limiting to over-limiting current transition. Previous experimental studies have examined rectification at either low-voltages (under-limiting current region) for conical nanopores/funnel-shaped nanochannels or at high-voltages (over-limiting region) for straight nanochannels with asymmetric entrances or asymmetric interfacing microchannels. The observed rectification inversion occurs because the system resistance is shifted, beyond a threshold voltage, from being controlled by intra-channel ion concentration-polarization to that controlled by external concentration-polarization. Additionally, strong hysteresis effects, due to residual concentration-polarization, manifest themselves through the dependence of the transient current rectification on voltage scan rate.

中文翻译：

漏斗形纳米通道中的离子电流整流：磁滞和反转效应

在高于阈值电压的漏斗形纳米通道中观察到离子电流整流反演，该阈值电压大致对应于从下限到上限的电流跃迁。先前的实验研究已经检查了圆锥形纳米孔/漏斗形纳米通道在低电压（限流区域以下）或不对称入口或不对称接口微通道的直纳米通道在高电压（限流区域）上的整流。观察到的整流反转的发生是因为系统电阻从通道内离子浓度极化控制转变为外部浓度极化控制，超过了阈值电压。此外，由于残留的浓度极化作用，磁滞效应很强，

更新日期：2015-12-11

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