期刊
BIOMICROFLUIDICS
卷 4, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3279787
关键词
bioMEMS; electrokinetic effects; electrophoresis; finite element analysis; microchannel flow; particle size
资金
- Korea Evaluation Institute of Industrial Technology (KEIT) [B0008557] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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