Chapter

Electrokinetics Of Particles And Fluids

Hywel Morgan, Nicolas G. Green and Tao Sun

in Micro/Nano Technology Systems for Biomedical Applications

Published in print March 2010 | ISBN: 9780199219698
Published online September 2010 | e-ISBN: 9780191594229 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199219698.003.0005
Electrokinetics Of Particles And Fluids

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Microfluidic systems offer integration of multiple functions on a single platform. Automated or remote manipulation and analysis of particles and fluids is a key element in micro-technologies and Lab-on-a-Chip. In most Lab-on-a-Chip systems, the behaviour of particles and fluids on the microscale is determined by a number of forces. Electrokinetic forces act on particles, either through forces on fixed charge or a second order force on the dipole. Electrohydrodynamic forces on the liquid are predominantly due to double layer charge or body forces due to gradients in conductivity and/or permittivity created by thermal gradients. This chapter reviews the theory of electrokinetics in DC and AC fields, and its application to the manipulation of particles. Then the discussion goes to the theories and application of electrohydrodynamic effects in microsystems, focusing on electroosmosis and electrothermal effects in AC field.

Keywords: dielectric theory; microfluidics; micro-particles; electrokinetics; electrohydrodynamics ac electrokinetics; dielectrophoresis

Chapter.  14018 words.  Illustrated.

Subjects: Bioinformatics and Computational Biology

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