American Chemical Society
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Stabilization of Ion Concentration Polarization Using a Heterogeneous Nanoporous Junction

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posted on 2010-01-13, 00:00 authored by Pilnam Kim, Sung Jae Kim, Jongyoon Han, Kahp Y. Suh
We demonstrate a recycled ion-flux through heterogeneous nanoporous junctions, which induce stable ion concentration polarization with an electric field. The nanoporous junctions are based on integration of ionic hydrogels whose surfaces are negatively or positively charged for cationic or anionic selectivity, respectively. Such heterogeneous junctions can be matched up in a way to achieve continuous ion-flux operation for stable concentration gradient or ionic conductance. Furthermore, the combined junctions can be used to accumulate ions on a specific region of the device.