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Issue 10, 2010
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Flow field effect transistors with polarisable interface for EOF tunable microfluidic separation devices

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Abstract

A method is proposed to control the zeta potential in microchannels using electrically polarisable interfaces in direct contact with the electrolyte. The approach is based on the use of conducting layers exhibiting minimal electrochemical reactions with aqueous electrolytes but a large potential window (typically from −2 V to +2 V) enabling tuning their zeta potential without detrimental faradic reactions. SiC, Al and CNx interfaces were deposited on glass surfaces and then integrated into glass–PDMS–glass devices. The effect of the zeta potential control was monitored by measuring the electro-osmotic flow using a microfluidic Wheatstone Bridge. The experimental results are in good agreement with theoretical predictions based on a one dimensional modeling. The electro-osmotic flow control obtained at high pH values suggests that it should be possible to use such devices as Polarisable Interface Flow-Field Effect Transistors (PI-FFETs) to overcome the difficulties met with conventional metal-isolator-electrolyte systems (MIE-FFETs) for electrokinetic separation applications.

Graphical abstract: Flow field effect transistors with polarisable interface for EOF tunable microfluidic separation devices

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Publication details

The article was received on 19 Oct 2009, accepted on 12 Jan 2010 and first published on 11 Feb 2010


Article type: Paper
DOI: 10.1039/B921808D
Citation: Lab Chip, 2010,10, 1245-1253
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    Flow field effect transistors with polarisable interface for EOF tunable microfluidic separation devices

    A. Plecis, J. Tazid, A. Pallandre, P. Martinhon, C. Deslouis, Y. Chen and A. M. Haghiri-Gosnet, Lab Chip, 2010, 10, 1245
    DOI: 10.1039/B921808D

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