Molecular dynamics study of an electro-kinetic fluid transport in a charged nanochannel based on the role of the stern layer

Rezaei, Majid; Azimian, A. R.; Toghraie, Davood

doi:10.1016/j.physa.2015.01.043

Cited by 101 publications

(32 citation statements)

References 32 publications

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“…Note, however, that as a function of the electric field strength, the electroosmotic mobility increases, which is caused by extension of the double layer width under influence of the hydrodynamic lift force. 32 This nonlinear effect is not expected to be observed in experiments, because the electric field strength used is typically significantly lower. Note that the electric field strength used in this study is just outside the linear electroosmosis regime (see Fig.…”

Section: Dependence On the Interfacial Parametersmentioning

confidence: 99%

“…The electroosmotic velocity exhibits a nonmonotonous profile as a function of the surface charge density S, as reported previously. [31][32][33] In particular, the electroosmotic flow exhibits a maximum when half of the charge is located in the Helmholtz layers, an inflection point appears when the surface charge is screened entirely in the Helmholtz layers, and mobility reversal is observed when the charge is primarily located in the inner Helmholtz layer. Based on these observations, we mark three special values of S in Fig.…”

Section: Electroosmotic Mobilitymentioning

confidence: 99%

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Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Rezaei

Azimian

Pishevar

et al. 2018

Phys. Chem. Chem. Phys.

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We study the ion density, shear viscosity and electroosmotic mobility of an aqueous monovalent electrolyte at a charged solid surface using molecular dynamics simulations. Upon increasing the surface charge density, ions are displaced first from the diffuse layer to the outer Helmholtz layer, increasing its viscosity, and subsequently to the hydrodynamically stagnant inner Helmholtz layer. The ion redistribution causes both charge inversion and reversal of the electroosmotic mobility. Because of the surface-charge dependent interfacial hydrodynamic properties, however, the charge density of mobility reversal differs from the charge density of charge inversion, depending on the salt concentration and the chemical details of the ions and the surface. Mobility reversal cannot be described by an effective slip boundary condition alone - the spatial dependence of the viscosity is essential.

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Section: Dependence On the Interfacial Parametersmentioning

confidence: 99%

Section: Electroosmotic Mobilitymentioning

confidence: 99%

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Rezaei

Azimian

Pishevar

et al. 2018

Phys. Chem. Chem. Phys.

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“…Finally, according to the drawn diagrams, it can be found that, velocity and consequently temperature of nanochannel increase with increased number of nanofluid, which is in turn an effective factor in increasing the thermal conduction and energy optimization. The extension of this paper and our previous works [21][22][23][24][25][26][27][28][29] affords engineers a good option for nanochannel simulation. …”

Section: Resultsmentioning

confidence: 69%

Molecular dynamic simulation of Copper and Platinum nanoparticles Poiseuille flow in a nanochannels

Toghraie

Mahdavi

Afrand

2016

Physica E: Low-dimensional Systems and Nanostructures

119

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“…They have all proven capable of single molecule sensing 7 , detecting proteins 8,9 , DNA sequencing 10 and, in conjunction with DNA nanotechnology, detection of single nucleotide polymorphisms 11 and specific proteins from mixtures 12 .Hydrodynamic and electrokinetic phenomena dictate the behavior of analytes in nanopores. There are many works theoretically and experimentally probing the details of these phenomena with regards to micro-and nanofluidic systems [13][14][15][16] . Here, of prime importance is electroosmosis.…”

mentioning

confidence: 99%

“…Hydrodynamic and electrokinetic phenomena dictate the behavior of analytes in nanopores. There are many works theoretically and experimentally probing the details of these phenomena with regards to micro-and nanofluidic systems [13][14][15][16] . Here, of prime importance is electroosmosis.…”

mentioning

confidence: 99%

Cation dependent electroosmotic flow in glass nanopores

Hugh

Andresen

Keyser

2019

Applied Physics Letters

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We present our findings on the changes to electroosmotic flow outside glass nanopores with respect to the choice of Group 1 cation species. In contrast with standard electrokinetic theory, flow reversal was observed for all salts under a negative driving voltage. Moving down Group 1 resulted in weaker flow when the driving voltage was negative, in line with the reduction in the zeta potential on the glass surface going down the periodic table. No trend emerged with a positive driving voltage, however for Cs, flow was uniquely found to be in reverse. These results are explained by the interplay between the flow inside the nanopore and flow along the outer walls in the vicinity of the nanopore.Nanopores are sensors based on the resistive-pulse technique 1 . Sensing is achieved by monitoring the ionic current through a nanoscale aperture in electrolytic solution. Nanopores exist in a variety of forms, the earliest used for sensing being the biological nanopore α-haemolysin 2,3 . Today many solid state nanopore systems are known, primary examples of these being Si 3 N 4 4 , quartz glass 5 and graphene 6 . They have all proven capable of single molecule sensing 7 , detecting proteins 8,9 , DNA sequencing 10 and, in conjunction with DNA nanotechnology, detection of single nucleotide polymorphisms 11 and specific proteins from mixtures 12 .Hydrodynamic and electrokinetic phenomena dictate the behavior of analytes in nanopores. There are many works theoretically and experimentally probing the details of these phenomena with regards to micro-and nanofluidic systems [13][14][15][16] . Here, of prime importance is electroosmosis. Si 3 N 4 and glass nanopores have a negative surface charge in solution at biological pH. This results in a build-up of positive ions proximate to the surface 17 . Applying an electric field to drive an analyte through a nanopore causes the charges at the surface to move. The moving charges couple to the fluid medium and result in electroosmotic flow (EOF). This effect is depicted in Fig. 1(a). The force a target molecule experiences in nanopores thus depends sensitively on the direction and strength of EOF 18,19 ; it may slow the target down in a manner useful for sensing, or it may deny entry to molecules, hampering throughput 18,20,21 . As such, EOF in nanopores has been extensively studied 22-24 , including reports of enhancement of molecular binding within an α-haemolysin nanopore with EOF 25 , facilitated protein capture in Fragaceatoxin C nanopores using EOF 26 , and recently the demonstration that EOF can be used to control the folding state of DNA entering glass nanopores 27 .Applying an electric field through the nanopore not only drives flow from within the pore, it establishes a flow field in the region outside the pore that is several microns a) Email: ufk20@cam.ac.uk in extent. This field can be quantified by a single parameter, P , the force required to generate this field in an otherwise calm fluid. This force originates from an immersed fluid jet which is described by the Landau-Sq...

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Molecular dynamics study of an electro-kinetic fluid transport in a charged nanochannel based on the role of the stern layer

Cited by 101 publications

References 32 publications

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Molecular dynamic simulation of Copper and Platinum nanoparticles Poiseuille flow in a nanochannels

Cation dependent electroosmotic flow in glass nanopores

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