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- W2100029545 abstract "Abstract A glass microfluidic device is presented in which a microchannel is split into two regions with different electric fields by a nanochannel intermediate electrode junction formed by dielectric breakdown. The objective is to sink current through the nanochannel junction without sample loss or broadening of the band as it passes the junction. This type of performance is desired in many microfluidic applications, including the coupling of microchannel/CE with ESI‐MS, electrochemical detection, and electric field gradient focusing. The voltage offsets in this study are suitable for microchannel/CE‐ESI‐MS. Imaging of the transport of model anions and cations through the junction indicates that the junction exhibits nanofluidic behavior and the mean depth of the nanochannel is estimated to be ∼105 nm. The ion permselectivity of the nanochannel induces concentration polarization and enriched and depleted concentration polarization zones form on opposite sides of the nanochannel, altering the current and electric field distributions along the main microchannel. Anion transport efficiency past the junction was high, 96.0%, and varied little over the pH range of 4.0–8.0. In contrast, cation transport is much lower, and decreases from 72 to 11% from pH 4.0 to 8.0. Band broadening increases with increasing pH less than 70% over the pH range of 4.0–8.0. It is anticipated that this characterization will aid in the understanding and optimization of such junctions made from permselective membranes and porous glass." @default.
- W2100029545 created "2016-06-24" @default.
- W2100029545 creator A5004913584 @default.
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- W2100029545 date "2010-07-23" @default.
- W2100029545 modified "2023-09-25" @default.
- W2100029545 title "Analyte transport past a nanofluidic intermediate electrode junction in a microfluidic device" @default.
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- W2100029545 doi "https://doi.org/10.1002/elps.201000068" @default.
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