Dielectrophoretic choking phenomenon in a converging-diverging microchannel

Title
Dielectrophoretic choking phenomenon in a converging-diverging microchannel
Author(s)
주상우아이[아이]리유[리유]츠엔[츠엔]
Keywords
MAXWELL STRESS TENSOR; ELECTROPHORETIC MOTION; SPHERICAL-PARTICLE; CYLINDRICAL PARTICLES; SEPARATION; FORCE; NANOTUBE; DNA; MICROCONTRACTION; BOUNDARY
Issue Date
201003
Publisher
AMER INST PHYSICS
Citation
BIOMICROFLUIDICS, v.4, no.1
Abstract
Experiments show that particles smaller than the throat size of converging-diverging microchannels can sometimes be trapped near the throat. This critical phenomenon is associated with the negative dc dielectrophoresis arising from nonuniform electric fields in the microchannels. A finite-element model, accounting for the particle-fluid-electric field interactions, is employed to investigate the conditions for this dielectrophoretic (DEP) choking in a converging-diverging microchannel for the first time. It is shown quantitatively that the DEP choking occurs for high nonuniformity of electric fields, high ratio of particle size to throat size, and high ratio of particle's zeta potential to that of microchannel.
URI
http://hdl.handle.net/YU.REPOSITORY/22756http://dx.doi.org/10.1063/1.3279787
ISSN
1932-1058
Appears in Collections:
공과대학 > 기계공학부 > Articles
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