RETRACTED ARTICLE: Induced-charge electrokinetic phenomena

Daghighi, Yasaman; Li, Dongqing

doi:10.1007/s10404-010-0607-2

Cited by 15 publications

(2 citation statements)

References 68 publications

(98 reference statements)

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“…For a thorough review of current advances in this field, the reader is directed to Refs. [13,14]. In a symmetric system, such as a sphere suspended in an unbounded electrolyte and subjected to uniform electric forcing, interaction of DIP forces generates a quadrupolar flow, known as induced-charge electroosmosis (ICEO) about the initially uncharged particle.…”

Section: Introductionmentioning

confidence: 99%

Induced‐charge electrophoresis of uncharged dielectric spherical Janus particles

Boymelgreen

Miloh²

2012

Electrophoresis

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We derive the equations governing the dipolophoretic motion of an electrically inhomogeneous Janus particle composed of two hemispheres with differing permittivities. The general formulation is valid for any electric forcing, including alternating current (AC) and makes no assumptions regarding the size of the electric double layer (EDL). The solution is thus valid even for nanoparticles where the particle radius can be of the same order as the EDL thickness. Semi-analytic and numerical solutions for the linear phoretic velocity and angular rotation of a single Janus particle suspended in an infinite medium are given in the limit of uniform direct current (DC) electric forcing. It is determined that particle mobility is a function of the permittivity in each hemisphere and the contrast between them as well as the EDL length. For a particle in which both hemispheres are characterized by a finite permittivity, we discover that maximum mobility and rotation is not obtained in the Helmholtz-Smoluchowski thin EDL limit but is rather a function of the permittivity and EDL properties.

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Section: Introductionmentioning

confidence: 99%

Induced‐charge electrophoresis of uncharged dielectric spherical Janus particles

Boymelgreen

Miloh²

2012

Electrophoresis

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“…Similar flows around metallic colloids with fixed total charge have been shown in the Russian literature (Gamayunov et al 1986;Murtsovkin 1996). A very recent review of inducedcharge electrokinetic phenomena has been published by Daghighi and Li (2010). Typically, the application of ICEO results in recirculation regions surrounding a polarizable object.…”

Section: Introductionmentioning

confidence: 98%

Localized flow control in microchannels using induced-charge electroosmosis near conductive obstacles

Sharp

Yazdi

Davison

2010

Microfluid Nanofluid

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In this paper, we investigate the use of inducedcharge electroosmosis (ICEO) as a means of providing localized flow control near conductive obstacles within bulk pressure-driven flow. In an experimental device, this ICEO flow was induced by an on/off switchable AC field applied across a section containing gold post(s). A simple numerical model, adapted from Levitan et al. (Colloids Surf A 267:122-132, 2005), was implemented and used to provide guidance for the design of the experimental devices. The induced flow was combined with an applied bulk pressure-driven flow to modify flow patterns. We have specifically observed single and multiple stream patterns downstream of the posts in the experimental devices, suggesting the presence of ICEO flow in the experimental system. The custom devices were obtained using a fabrication process that relies on relatively standard steps in the MEMS community, however, unlike other fabrication processes, it has been shown to create fully conductive posts with vertical sidewalls. Utilizing various combinations of number(s) of post(s), geometry and position, useful flow patterns can be created.

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