Generation of Dielectrophoretic Force under Uniform Electric Field
Name
IMST006.pdf
Size
57.98 KB
Format
Adobe PDF
Checksum (MD5)
0713e5c726c72e180297addcc9b65f64
Author(s)
Kua, C.H.
Yang, C.
Goh, S.
Isabel, R.
Youcef-Toumi, Kamal
Lam, Yee Cheong
Date Issued
January 2006
Series/Report no.
Innovation in Manufacturing Systems and Technology (IMST)
Abstract
Effective dipole moment method has been widely accepted as the de facto technique in predicting the dielectrophoretic force due to the non-uniform electric field. In this method, a finite-particle is modeled as an equivalent point-dipole that would induce a same electric field under the external electric field. This approach is only valid when the particle size is significantly smaller than the characteristic length of interest. This assumption is often violated in a microfluidic device, where the thickness or width of the microchannel can be as small as the particle. It is shown in this numerical study that when the dimensions of the particle were in the same order of magnitude as the characteristic length of the device, dielectrophoretic force can be induced even in a uniform electric field. This force arises due to the disturbance of the particle and the bounding wall.
Subjects
electrostatic force
dipole moment
dielectrophoresis
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