Jump to main content
Jump to site search

Issue 20, 2011
Previous Article Next Article

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

Author affiliations

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

Back to tab navigation

Supplementary files

Article information


Submitted
21 Jun 2011
Accepted
27 Jul 2011
First published
25 Aug 2011

Analyst, 2011,136, 4134-4137
Article type
Communication

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

Social activity

Search articles by author

Spotlight

Advertisements