Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-06-11
Phys. Rev. E 69, 051402 (2004)
Physics
Condensed Matter
Soft Condensed Matter
Revised version with minor changes: References added and discussion extended
Scientific paper
10.1103/PhysRevE.69.051402
We present a theory to investigate electro-kinetic behavior, namely, electrorotation and dielectrophoresis under alternating current (AC) applied fields for a pair of touching inhomogeneous colloidal particles and biological cells. These inhomogeneous particles are treated as graded ones with physically motivated model dielectric and conductivity profiles. The mutual polarization interaction between the particles yields a change in their respective dipole moments, and hence in the AC electrokinetic spectra. The multipolar interactions between polarized particles are accurately captured by the multiple images method. In the point-dipole limit, our theory reproduces the known results. We find that the multipolar interactions as well as the spatial fluctuations inside the particles can affect the AC electrokinetic spectra significantly.
Dong Lai
Gu G. Q.
Huang Ji Ping
Karttunen Mikko
Yu Kin Wah
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