Dielectrophoresis of nanoparticles

Document Type

Article

Publication Date

1-1-2004

Abstract

A numerical scheme based on the distributed Lagrange multiplier method (DLM) is used to study the motion of nano-sized particles of dielectric suspensions subjected to uniform and nonuniform electric fields. Particles are subjected to both electrostatic and hydrodynamic forces, as well as Brownian motion. The results of the simulations presented in this paper show that uniform electric fields the evolution of the particle structures depends on the ratio of electrostatic particle-particle interactions and Brownian forces. When this ratio is of the order of 100 or greater, particles form stable chains and columns, whereas when it is of the order of 10 or smaller the particle distribution is random. For the nonuniform electric field cases considered in this paper, the relative magnitude of Brownian forces is in the range such that it does not influence the eventual collection of particles by dielectrophoresis and the particular locations where the particles are collected. However, Brownian motion is observed to influence the transient particle trajectories. The deviation of the particle trajectories compared to those determined by the electrostatic and hydrodynamic forces alone is characterized by the ratio of Brownian and dielectrophoretic forces. © 2004 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Identifier

10944245788 (Scopus)

Publication Title

Electrophoresis

External Full Text Location

https://doi.org/10.1002/elps.200406092

ISSN

01730835

PubMed ID

15565698

First Page

3625

Last Page

3632

Issue

21-22

Volume

25

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