Dielectrophoretic particle–particle interaction under AC electrohydrodynamic flow conditions

Lee, Doh-Hyoung; Yu, Chengjie; Papazoglou, Elisabeth S.; Farouk, Bakhtier; Noh, Hyunwoo

doi:10.1002/elps.201100070

Cited by 22 publications

(15 citation statements)

References 24 publications

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“…All rights reserved. particle-particle interaction under AC electric fields have been performed [17,18]. The experimental results revealed that the particle chain style depended on the frequency of AC electric fields [19].…”

Section: Introductionmentioning

confidence: 99%

Frequency effects on interactive motion of dielectrophoretic particles in an AC electrical field

Xie

Liu

Chen

et al. 2015

European Journal of Mechanics - B/Fluids

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Section: Introductionmentioning

confidence: 99%

Frequency effects on interactive motion of dielectrophoretic particles in an AC electrical field

Xie

Liu

Chen

et al. 2015

European Journal of Mechanics - B/Fluids

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“…35 Yet DEP force and uidic drag is generally regarded as the most dominant driving mechanisms in an AC dielectrophoretic process, as indicated by Liu et al in the estimation of various forces exerted on nanoparticle by an analysis of the order of magnitude. 35 Yet DEP force and uidic drag is generally regarded as the most dominant driving mechanisms in an AC dielectrophoretic process, as indicated by Liu et al in the estimation of various forces exerted on nanoparticle by an analysis of the order of magnitude.…”

Section: Resultant Velocity Of Nanoparticle Motionmentioning

confidence: 99%

Particle clustering during pearl chain formation in a conductive-island based dielectrophoretic assembly system

et al. 2015

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A dielectrophoretically (DEP) assembled metal nanoparticle chain can serve as an electrical connector between small conductive elements in wet electronics or as a sensing element for chemical and biological substances. Obviously, the morphology of the nanoparticle assembled chain has a strong influence on electrical conductance and surface area of this connector. This paper presents an experimental discovery that as a connection of the electrode pair to an initially isolated conductive island is formed by the assembled nanoparticle chain, an abundance of particle clusters can also be generated, which tend to accumulate on the edge of the conductive structures under certain conditions. These particle clusters either can have an undesirable impact on consistency in electrical conductance of the electric circuit or can be used to enhance the susceptibility of the sensors due to an increased surface area. Therefore, exploration is also made for manipulating and assembling metallic nanoparticles on the surface or edge of a conductive island by changing the AC frequency in the conductive island based DEP assembly system. In order to develop an explanation of the experimental observations, numerical simulation is performed to investigate the combined influence of DEP force and electrothermal flow on individual nanoparticles by taking account of the near-field effect due to particle-solid interaction or particle-particle interaction.

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“…However, since the conditions under which they are significant may be different from those for DEP , we can design our experiments under conditions in which the unwanted effects are negligible. Since ETF is most pronounced for high electrical conductivity media (>10 −2 S/m) , we conduct our experiments at a low salt concentration (∼10 −3 S/m), where the effects due to ETF are small. Since in our experiment ACEO flows near the mid‐plane are relatively weak and pointing primarily in the direction perpendicular to the plane of the electrodes , we trap the particles at a location not far from the mid‐plane and probe the DEP force in the horizontal direction parallel to the plane of the electrodes .…”

Section: Methodsmentioning

confidence: 99%

Dielectrophoresis force spectroscopy for colloidal clusters

2012

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Optical trapping-based force spectroscopy was used to measure the frequency-dependent DEP forces and DEP crossover frequencies of colloidal polymethyl methacrylate spheres and clusters. A single sphere or cluster, held by an optical tweezer, was positioned near the center of a pair of gold-film electrodes where alternating current elecroosmosis flow was negligible. Use of amplitude modulation and phase-sensitive lock-in detection for accurate measurement of the DEP force yielded new insight into dielectric relaxation mechanisms near the crossover frequencies. On one hand, the size dependence of the DEP force near the crossover frequencies indicates that the dominant polarization mechanism is a volume effect. On the other hand, the power-law dependence of the crossover frequency on the particle radius with an exponent of -2 indicates the dielectric relaxation is more likely because of ionic diffusion across the particle surface, suggesting the dominant polarization mechanism may be a surface polarization effect. Better theories are needed to explain the experiment. Nevertheless, the strong size dependence of the crossover frequencies suggests the use of DEP for size sorting of micron-sized particles.

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Dielectrophoretic particle–particle interaction under AC electrohydrodynamic flow conditions

Cited by 22 publications

References 24 publications

Frequency effects on interactive motion of dielectrophoretic particles in an AC electrical field

Frequency effects on interactive motion of dielectrophoretic particles in an AC electrical field

Particle clustering during pearl chain formation in a conductive-island based dielectrophoretic assembly system

Dielectrophoresis force spectroscopy for colloidal clusters

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