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

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 nanocha...

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Bibliographic Details
Published in:Soft matter 2013-01, Vol.9 (41), p.9767-9773
Main Authors: Benson, Laura, Yeh, Li-Hsien, Chou, Tzung-Han, Qian, Shizhi
Format: Article
Language:English
Subjects:
Brushes
Control
Electrokinetics
Gates
Nanocomposites
Nanomaterials
Nanostructure
Polyelectrolytes
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Summary: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. Field effect modulation of the Donnan potential and electrokinetic flow (EKF) in a functionalized soft nanochannel is examined for potential applications in next generation nanofluidics based biosensing devices.
ISSN:1744-683X
1744-6848
DOI:10.1039/c3sm51981c