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TitleParticle patterning using fluidics and electric fields
Publication TypeJournal Article
Year of Publication2008
AuthorsArnold, W.M.
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Pagination144 - 151
Date Published2008
ISSN10709878 (ISSN)
KeywordsArtificial tissue, Charged particles, Electric fields, Electrophoresis, Field-induced forces, FLOW OF FLUIDS, Fluidics, Particle incorporation, Suspensions (fluids)
AbstractElectric-field manipulation of micro-particles in suspension can create patterns via a number of particle forces and fluid flows. These effects are assessed for their suitability for down-scaling to form nano-patterns such as may be incorporated into structured nano-composites. Consideration is given not only to the assembly of field-aligned chains or wires, but also to methods that can give cross-field assembly and even 2-D patterns or crystals. Dielectrophoresis is often the dominant driving force behind particle assembly, but other dipole-dipole interactions and also electrically-driven fluid flows are increasingly recognized as significant or dominant. Orientation of nonspherical particles in frequency-selectable directions is also possible. Estimates for the threshold field strengths required for using these effects to handle nano-particles are considered. Finally the use of media with modified permittivity to increase the field-induced forces or to optimize the selectivity of particle incorporation is discussed. © 2008 IEEE.

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