Changing nanoslot ion flux with a dynamic nanocolloid ion-selective filter: Secondary overlimiting currents due to nanocolloid-nanoslot interaction

Gilad Yossifon, Hsueh Chia Chang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Nanocolloids trapped at the depleted side (anodic) of a fluidic nanoslot entrance are shown to sensitively regulate dc ion transport through the nanoslot, such that a second limiting-overlimiting transition occurs in its nonlinear current-voltage characteristics. The nanocolloids, brought to the entrance by electro-osmosis, are not stationary but are confined to closed circular and toroidal streamlines, driven by a back-pressure corner vortex and an orthogonal electroconvection vortex instability. The transition from the corner vortex to a complex torus with both vortical motions coincides with the first overlimiting transition, while electrostatic interaction of nanocolloids in these vortices with the nanoslot entrance drives the second limiting transition.

Original languageEnglish
Article number066317
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume81
Issue number6
DOIs
StatePublished - 29 Jun 2010
Externally publishedYes

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