N G Green et al 2000 J. Phys. D: Appl. Phys. 33 632 doi:10.1088/0022-3727/33/6/308
Ac electrokinetics: a survey of sub-micrometre particle dynamics
N G Green
, A Ramos and H Morgan
Particles suspended in fluid exhibit motion when subjected to ac electric fields. The applied field results in forces on both the particles and the fluid, the study of which is referred to as ac electrokinetics. The ac electrokinetic techniques can be used for the controlled manipulation and characterization of particles, and the separation of mixtures. For sub-micrometre particles, Brownian motion is important and strong electric fields are required to overcome these effects. Planar micro-electrode arrays, fabricated using semiconductor manufacturing processes, can generate electric fields of the required strength from low potentials over a wide range of frequencies. This paper reviews and discusses sub-micrometre particle dynamics under the influence of dielectrophoretic and electrohydrodynamic forces. New experimental observations of the movement of sub-micrometre particles are also presented.
- PACS
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47.54.-r Pattern selection; pattern formation
47.65.-d Magnetohydrodynamics and electrohydrodynamics
- Subjects
- Dates
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Issue 6 (21 March 2000)
Received 10 December 1999, in final form 28 January 2000
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Ac electrokinetics: a survey of sub-micrometre particle dynamics
N G Green et al 2000 J. Phys. D: Appl. Phys. 33 632
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