NDLI: Manipulation of Bio-Particles in Microelectrode Structures by Means of Non-Uniform AC Electric Fields

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Castellanos, Antonio Ramos, Antonio Gonza´lez, Antonio Morgan, Hywel Green, Nicolas
Copyright Year	2002
Abstract	Non-uniform ac electric fields induce movement of polarizable particles. This phenomenon, known as dielectrophoresis, is useful to manipulate bioparticles. High electric fields when used in bio-separation systems give rise to fluid motion, which in turn results in a viscous drag on the particle. These fields generate heat, leading to volume forces in the liquid. Gradients in conductivity and permittivity rise to electrothermal forces; gradients in mass density to buoyancy. Also non-uniform ac electric fields produce forces on the induced charges in the diffuse double layer on the electrodes, and the resulting steady fluid motion has been termed ac electroosmosis. The effects of Brownian motion and diffusion are also discussed in this context. The orders of magnitude of the various forces experienced by a submicrometre particle in a model electrode system are calculated. The results are compared with experiments and the relative influence of each type of force is described.
Sponsorship	Materials Division
Starting Page	165
Ending Page	170
Page Count	6
File Format	PDF
ISBN	0791836401
DOI	10.1115/IMECE2002-39617
Volume Number	Materials: Processing, Characterization and Modeling of Novel Nano-Engineered and Surface Engineered Materials
Conference Proceedings	ASME 2002 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2002-11-17
Publisher Place	New Orleans, Louisiana, USA
Access Restriction	Subscribed
Subject Keyword	Electrical conductivity Electrical properties Buoyancy Drag (fluid dynamics) Separation (technology) Density Diffusion (physics) Electrodes Brownian motion Fluids Heat Particulate matter Electroosmosis Thermal conductivity Dielectrophoresis Electric fields
Content Type	Text
Resource Type	Article

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