Diffusiophoresis of a spherical particle normal to an air–water interface

Lou, James; Shih, Chang-tai; Lee, Eric

doi:10.1016/j.jcis.2008.11.015

Cited by 19 publications

(29 citation statements)

References 34 publications

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“…Furthermore, the shear stress exerted on the tangential plane at the interface must vanish there too, as inferred by the assumption that the air phase is inviscid [8,22]. Hence we have:…”

Section: Linearized Perturbed Statementioning

confidence: 93%

“…Either situation is excluded from the scope of the current analysis. A pseudospectral method adopted by Lee et al [7][8][9] is applied here again for the solution of the resulted governing electrokinetic equations. The method has proven to be a very powerful tool treating electrophoresis problems and other electrokinetic systems.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of a planar wall in general was found to retard the particle motion due to the hydrodynamic drag and the electrostatic interaction with the double layer surrounding the particle. In particular, Lou and Lee [8] found that whether the double layer touches the plane serves as a criterion predicting the overall impact on the magnitude and direction of the particle motion. Corresponding studies for a free surface, however, has been quite limited.…”

mentioning

confidence: 99%

“…The mobility of a particle can thus be calculated based on the requirement that the net force acting on the particle surface, the summation of the electric driving force and the retarding hydrodynamic force, must vanish at the quasi-steady state in electrophoresis. The details of the numerical procedure can be found elsewhere [6][7][8]. …”

mentioning

confidence: 99%

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Electrophoresis of a spherical particle normal to an air–water interface

Tsai

Lou

et al. 2010

Electrophoresis

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Electrophoresis of a spherical particle normal to an air-water interface is considered theoretically in this study. The presence of the air-water interface is found to reduce the particle mobility in general, especially when the double layer is very thick. This boundary effect diminishes as the double layer gets very thin. The higher the surface potential, the more significant the reduction of mobility due to the polarization effect from the double layer deformation when the particle is in motion. Local extrema are observed in the mobility profiles with varying double layer thickness as a result. Comparison with a solid planar boundary is made. It is found that the particle mobility near an air-water interface is smaller than that near a solid one when the double layer is thick, and vice versa when the double layer is thin, with a critical threshold value of double layer thickness corresponding roughly to the touch of the interface. The reason behind it is clearly explained as the buildup of electric potential at the air-water interface, which reduces the driving force as a result.

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“…Furthermore, the shear stress exerted on the tangential plane at the interface must vanish there too, as inferred by the assumption that the air phase is inviscid [8,22]. Hence we have:…”

Section: Linearized Perturbed Statementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Electrophoresis of a spherical particle normal to an air–water interface

Tsai

Lou

et al. 2010

Electrophoresis

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“…thick EDL and small gap between the particle surface and nanopore wall), the EDL surrounding the charged nanoparticle is compressed by the nanopore wall, and the type I DLP mainly arises from the EDL compression by the boundary. [34,37,38,48] If the EDL compression by the nanopore wall is insignificant, as the ratio a/a p increases, the degree of DLP decreases, leading to the decrease in the induced electrophoresis arising from the DLP-induced electric fields.…”

Section: Effect Of the Particle Surface Charge Density S Pmentioning

confidence: 99%

Diffusiophoresis of an Elongated Cylindrical Nanoparticle along the Axis of a Nanopore

et al. 2010

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The translation of a charged, elongated cylindrical nanoparticle along the axis of a nanopore driven by an imposed axial salt concentration gradient is investigated using a continuum theory, which consists of the ionic mass conservation equations for the ionic concentrations, the Poisson equation for the electric potential in the solution, and the modified Stokes equations for the hydrodynamic field. The diffusiophoretic motion is driven by the induced electrophoresis and chemiphoresis. The former is driven by the generated overall electric field arising from the difference in the ionic diffusivities and the double layer polarization, while the latter is generated by the induced osmotic pressure gradient around the charged particle. The induced diffusiophoretic motion is investigated as functions of the imposed salt concentration gradient, the ratio of the particle's radius to the double layer thickness, the cylinder's aspect ratio (length/radius), the ratio of the nanopore size to the particle size, the surface charge densities of the nanoparticle and the nanopore, and the type of the salt used. The induced diffusiophoretic motion of a nanorod in an uncharged nanopore is mainly governed by the induced electrophoresis, driven by the induced electric field arising from the double layer polarization. The induced particle motion is driven by the induced electroosmotic flow, if the charges of the nanorod and nanopore wall have the same sign.

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Effect of ion partitioning on diffusiophoresis of a soft particle with hydrophobic core

Majee

2023

Colloid Polym Sci

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Diffusiophoresis of a spherical particle normal to an air–water interface

Cited by 19 publications

References 34 publications

Electrophoresis of a spherical particle normal to an air–water interface

Electrophoresis of a spherical particle normal to an air–water interface

Diffusiophoresis of an Elongated Cylindrical Nanoparticle along the Axis of a Nanopore

Effect of ion partitioning on diffusiophoresis of a soft particle with hydrophobic core

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