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Issue 20, 2011
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Bipolar electrode depletion: membraneless filtration of charged species using an electrogenerated electric field gradient

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Abstract

We report a method for removing ions from aqueous solutions without the use of a membrane. The approach, which we call bipolar electrode depletion (BED), is based on the formation of an asymmetric electric field profile in a microchannel containing a bipolar electrode (BPE). The asymmetric field arises from local increases in conductivity caused by faradaic reactions at the BPE. We show how the asymmetric field can be used to deplete anions from a microchannel via a combination of electrophoresis and electroosmosis. We also apply this approach to filter an anionic species from a mixture of charged and neutral species being transported through a microchannel via electroosmosis. This technique could be utilized for desalination or filtration of any species possessing a net charge (e.g. heavy-metals, bacteria, proteins, or functionalized-nanoparticles).

Graphical abstract: Bipolar electrode depletion: membraneless filtration of charged species using an electrogenerated electric field gradient

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Publication details

The article was received on 21 Jun 2011, accepted on 27 Jul 2011 and first published on 25 Aug 2011


Article type: Communication
DOI: 10.1039/C1AN15510E
Analyst, 2011,136, 4134-4137

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    Bipolar electrode depletion: membraneless filtration of charged species using an electrogenerated electric field gradient

    E. Sheridan, K. N. Knust and R. M. Crooks, Analyst, 2011, 136, 4134
    DOI: 10.1039/C1AN15510E

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