The surface charge density effect on the electro-osmotic flow in a nanochannel: a molecular dynamics study

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

doi:10.1007/s00231-014-1441-y

Cited by 109 publications

(34 citation statements)

References 21 publications

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“…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%

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: 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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“…Therefore, understanding the electrohydrodynamics of the fluid in the EDL is critical in many applications, such as species separation, energy storage and conversion, and manipulation of single molecules. To obtain insight into physical mechanisms of electrokinetic transport and EDL structure, numerous computer simulation studies on EOF through the surfaces of solid substrates [ 12 , 13 , 14 , 15 , 16 , 17 ] have also been reported. However, the EDL structure becomes more complicated in the brush-grafted nanochannel because the properties of the EDL near solid-state surfaces is significantly disturbed by the conformational behavior of the polymer brush.…”

Section: Introductionmentioning

confidence: 99%

Electroosmotic Flow in Mixed Polymer Brush-Grafted Nanochannels

Cao

You

2016

Polymers

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Mixed polymer brush-grafted nanochannels-where two distinct species of polymers are alternately grafted on the inner surface of nanochannels-are an interesting class of nanostructured hybrid materials. By using a coarse-grained molecular dynamics simulation method, we are able to simulate the electrokinetic transport dynamics of the fluid in such nanochannels as well as the conformational behaviors of the mixed polymer brush. We find that (1) the brush adopts vertically-layered and longitudinally-separated structures due to the coupling of electroosmotic flow (EOF) and applied electric field; (2) the solvent quality affects the brush conformations and the transport properties of the EOF; (3) the EOF flux non-monotonically depends on the grafting density, although the EOF velocity in the central region of the channel monotonically depends on the grafting density.

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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: 95%

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

Toghraie

Mahdavi

Afrand

2016

Physica E: Low-dimensional Systems and Nanostructures

120

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The surface charge density effect on the electro-osmotic flow in a nanochannel: a molecular dynamics study

Cited by 109 publications

References 21 publications

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Viscous interfacial layer formation causes electroosmotic mobility reversal in monovalent electrolytes

Electroosmotic Flow in Mixed Polymer Brush-Grafted Nanochannels

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

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