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Issue 41, 2013
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Field effect regulation of Donnan potential and electrokinetic flow in a functionalized soft nanochannel

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Abstract

Controlling charge properties and electrokinetic flow (EKF) in a nanochannel is essential for the development of next generation nanofluidics based biosensing devices. In this study, active control of the Donnan potential and EKF in a functionalized soft nanochannel, comprising a solid-state nanochannel functionalized with a polyelectrolyte (PE) brush layer, using a field effect transistor (FET) is theoretically investigated for the first time. Both the magnitude and sign of the Donnan potential in the functionalized soft nanochannel can be effectively regulated by the gate potential imposed on the FET and the salt concentration. In addition, the salt concentration dependence of the EKF velocity profiles inside and outside the PE brush layer of the functionalized soft nanochannel are distinctly different.

Graphical abstract: Field effect regulation of Donnan potential and electrokinetic flow in a functionalized soft nanochannel

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Article information


Submitted
22 Jul 2013
Accepted
20 Aug 2013
First published
21 Aug 2013

Soft Matter, 2013,9, 9767-9773
Article type
Paper

Field effect regulation of Donnan potential and electrokinetic flow in a functionalized soft nanochannel

L. Benson, L. Yeh, T. Chou and S. Qian, Soft Matter, 2013, 9, 9767
DOI: 10.1039/C3SM51981C

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