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<title>Dielectrophoretic trapping without embedded electrodes</title>

2000; SPIE; Volume: 4177; Linguagem: Inglês

10.1117/12.395653

1996-756X

Eric B. Cummings, Anup K. Singh,

Electrical and Bioimpedance Tomography

We observe dielectrophoretic effects in mixed electrokinetic and dielectrophoretic flows in uniform arrays of posts. Above a threshold applied electric field, flowing filaments of concentrated and rarefied particles appear in the flow. Above a higher-threshold applied field, zones of highly concentrated, immobilized particles appear. At the lower and higher thresholds, dielectrophoresis apparently begins to dominate diffusion and advection/electrokinesis, respectively. The patterns of filaments and trapped zones depend dramatically on the angle of the array with respect to the mean applied electric field and the shape of the posts in the array.