Low-frequency dielectric response of charged oblate spheroidal particles immersed in an electrolyte

Physical Review. E
Chang-Yu HouPabitra N Sen

Abstract

We study the low-frequency polarization response of a surface-charged oblate spheroidal particle immersed in an electrolyte solution. Because the charged spheroid attracts counterions which form the electric double layer around the particle, using usual boundary conditions at the interface between the particle and electrolyte can be quite complicated and challenging. Hence, we generalize Fixman's boundary conditions, originally derived for spherical particles, to the case of the charged oblate spheroid. Given two different counterion distributions in the thin electric double-layer limit, we obtain analytic expressions for the polarization coefficients to the first nontrivial order in frequency. We find that the polarization response normal to the symmetry axis depends on the total amount of charge carried by the oblate spheroid while that parallel to the symmetry axis is suppressed when there is less charge on the edge of the spheroid. We further study the overall dielectric response for a dilute suspension of charged spheroids. We find that the dielectric enhancement at low frequency, which is driven by the presence of a large ζ potential (surface charge), is suppressed by high ion concentrations in the electrolyte and depends...Continue Reading

References

Aug 15, 1997·Journal of Colloid and Interface Science·J P Hsu, B T Liu
Aug 8, 2008·Journal of Colloid and Interface Science·C Chassagne, D Bedeaux

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Citations

Apr 24, 2018·Journal of Colloid and Interface Science·Chang-Yu HouDenise E Freed

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