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Electric field gradient focusing using a variable width polyaniline electrode

journal contribution
posted on 2012-11-01, 00:00 authored by C A Trickett, R D Henderson, Rosanne GuijtRosanne Guijt, M C Breadmore
A new approach for electric field gradient focusing (EFGF) based on the use of a variable-width polyaniline (PANI) electrode is demonstrated. The electrode was created by patterning a PANI nanofibre film using a 635-nm laser and a computer-controlled XY stage. The electrode consisted of 16 segments of varying width, ranging from 200 to 5000 μm in 320 μm increments, with the resistance changing approximately 20-fold from 3881 to 198 kΩ at each extreme, respectively. Application of a voltage across the electrode established a voltage gradient resulting in a non-linear distribution of electrophoretic velocities along the microchannel. When balanced with a combination of hydrodynamic flow and EOF, the variable-width PANI electrode could be used for the concentration and separation of two cationic dyes, rhodamine 6G and quinine, which were concentrated by at least threefold within 10 min.

History

Journal

Electrophoresis

Volume

33

Issue

21

Pagination

3254 - 3258

Publisher

Wiley-Blackwell

Location

London, Eng.

eISSN

1522-2683

Language

eng

Publication classification

C Journal article; C1.1 Refereed article in a scholarly journal

Copyright notice

2012, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim