Manipulating electrokinetic conductance of nanofluidic channel by varying inlet pH of solution

Alizadeh, A; Warkiani, ME; Wang, M

Manipulating electrokinetic conductance of nanofluidic channel by varying inlet pH of solution

Alizadeh, A Warkiani, ME

Wang, M

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Publication Type:: Journal Article
Citation:: Microfluidics and Nanofluidics, 2017, 21 (3)
Issue Date:: 2017-03-01

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Field	Value	Language
dc.contributor.author	Alizadeh, A	en_US
dc.contributor.author	Warkiani, ME https://orcid.org/0000-0002-4184-1944	en_US
dc.contributor.author	Wang, M	en_US
dc.date.issued	2017-03-01	en_US
dc.identifier.citation	Microfluidics and Nanofluidics, 2017, 21 (3)	en_US
dc.identifier.issn	1613-4982	en_US
dc.identifier.uri	http://hdl.handle.net/10453/126784
dc.description.abstract	© 2017, Springer-Verlag Berlin Heidelberg. The electrokinetic conductivity of micro-/nanofluidic systems, which strongly depends on the local solution properties (e.g., pH and ionic strength), has wide applications in nanosystems to control the system performance and ion rectification. Accurate and active manipulation of this parameter is proven to be very challenging since, in nanoscale, the ion transport is particularly dominated by the acquired surface charge on the solid–liquid interfaces. In this study, we propose an approach to manipulate the nanochannel electrokinetic conductivity by changing the pH value of the solution at the inlet in order to impose asymmetrical conditions inside nanochannel. The variable surface charge of walls is determined by considering the chemical adsorption on the solid–liquid interface and the electrical double layer interaction. The presented numerical model, which couples Poisson–Nernst–Planck and Navier–Stokes equations, can fully consider the electro-chemo-mechanical transport phenomena and predict the electrokinetic conductivity of nanofluidic channels with good accuracy. Modeling results show that the electrokinetic conductivity of the nanofluidic systems can be regulated by varying the solution pH at the inlet. It is revealed that the stronger electric double layers interaction can enhance the sensitivity of the nanochannel electrokinetic conductance to the inlet pH. This unique behavior of the nanochannel electrokinetic conductivity could broaden potential applications in biomedical, energy, and environmental systems using nanofluidic devices.	en_US
dc.relation.ispartof	Microfluidics and Nanofluidics	en_US
dc.relation.isbasedon	10.1007/s10404-017-1892-9	en_US
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Nanoscience & Nanotechnology	en_US
dc.title	Manipulating electrokinetic conductance of nanofluidic channel by varying inlet pH of solution	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	21	en_US
utslib.for	1007 Nanotechnology	en_US
utslib.for	0915 Interdisciplinary Engineering	en_US
utslib.for	0913 Mechanical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Biomedical Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CHT - Health Technologies
utslib.copyright.status	closed_access	*
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	21	en_US

Abstract:

© 2017, Springer-Verlag Berlin Heidelberg. The electrokinetic conductivity of micro-/nanofluidic systems, which strongly depends on the local solution properties (e.g., pH and ionic strength), has wide applications in nanosystems to control the system performance and ion rectification. Accurate and active manipulation of this parameter is proven to be very challenging since, in nanoscale, the ion transport is particularly dominated by the acquired surface charge on the solid–liquid interfaces. In this study, we propose an approach to manipulate the nanochannel electrokinetic conductivity by changing the pH value of the solution at the inlet in order to impose asymmetrical conditions inside nanochannel. The variable surface charge of walls is determined by considering the chemical adsorption on the solid–liquid interface and the electrical double layer interaction. The presented numerical model, which couples Poisson–Nernst–Planck and Navier–Stokes equations, can fully consider the electro-chemo-mechanical transport phenomena and predict the electrokinetic conductivity of nanofluidic channels with good accuracy. Modeling results show that the electrokinetic conductivity of the nanofluidic systems can be regulated by varying the solution pH at the inlet. It is revealed that the stronger electric double layers interaction can enhance the sensitivity of the nanochannel electrokinetic conductance to the inlet pH. This unique behavior of the nanochannel electrokinetic conductivity could broaden potential applications in biomedical, energy, and environmental systems using nanofluidic devices.

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http://hdl.handle.net/10453/126784