Electrokinetic behavior of two touching inhomogeneous biological cells and colloidal particles : effects of multipolar interactions

J.P. Huang, M.E.J. Karttunen, K.W. Yu, L. Dong, G.Q. Gu

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    24 Citations (Scopus)
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    Abstract

    We present a theory to investigate electrokinetic 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.
    Original languageEnglish
    Pages (from-to)051402-1/6
    Number of pages6
    JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
    Volume69
    Issue number5
    DOIs
    Publication statusPublished - 2004

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