Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2002-11-30
Phys. Rev. E 67, 021910 (2003)
Physics
Condensed Matter
Soft Condensed Matter
accepted by Phys. Rev. E
Scientific paper
10.1103/PhysRevE.67.021910
The dielectric dispersion, dielectrophoretic (DEP) and electrorotational (ER) spectra of spheroidal biological cell suspensions with an intrinsic dispersion in the constituent dielectric constants are investigated. By means of the spectral representation method, we express analytically the characteristic frequencies and dispersion strengths both for the effective dielectric constant and the Clausius-Mossotti factor (CMF). We identify four and six characteristic frequencies for the effective dielectric spectra and CMF respectively, all of them being dependent on the depolarization factor (or the cell shape). The analytical results allow us to examine the effects of the cell shape, the dispersion strength and the intrinsic frequency on the dielectric dispersion, DEP and ER spectra. Furthermore, we include the local-field effects due to the mutual interactions between cells in a dense suspension, and study the dependence of co-field or anti-field dispersion peaks on the volume fractions.
Gao Lei
Huang Ji Ping
Yu Kin Wah
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