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Proceedings Paper

A simulation of dielectrophoresis force actuated liquid lens
Author(s): Xiaoyin Yao; Jun Xia
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Paper Abstract

Dielectrophoresis (DEP) and electrowetting on dielectric (EWOD) are based on the electrokinetic mechanisms which have great potential in microfluidic manipulation. DEP dominate the movement of particles induced by polarization effects in nonuniform electric field ,while EWOD has become one of the most widely used tools for manipulating tiny amounts of liquids on solid surfaces. Liquid lens driven by EWOD have been well studied and developed. But liquid lens driven by DEP has not been studied adequately. This paper focuses on modeling liquid lens driven by DEP force. A simulation of DEP driven droplet dynamics was performed by coupling of the electrostatic field and the two-phase flow field. Two incompressible and dielectric liquids with different permittivity were chosen in the two-phase flow field. The DEP force density, in direct proportion to gradient of the square of the electric field intensity, was used as a body force density in Navier-Stokes equation. When voltage applied, the liquid with high permittivity flowed to the place where the gradient of the square of the electric field intensity was higher, and thus change the curvature of interface between two immiscible liquid. The differences between DEP and EWOD liquid lens were also presented.

Paper Details

Date Published: 20 November 2009
PDF: 12 pages
Proc. SPIE 7510, 2009 International Conference on Optical Instruments and Technology: MEMS/NEMS Technology and Applications, 751005 (20 November 2009); doi: 10.1117/12.837733
Show Author Affiliations
Xiaoyin Yao, Southeast Univ. (China)
Jun Xia, Southeast Univ. (China)


Published in SPIE Proceedings Vol. 7510:
2009 International Conference on Optical Instruments and Technology: MEMS/NEMS Technology and Applications
Zhaoying Zhou; Toshio Fukuda; Helmut Seidel; Xinxin Li; Haixia Zhang; Tianhong Cui, Editor(s)

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