Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The low-frequency dielectric response of charged oblate spheroidal
  particles immersed in an electrolyte   We study the low-frequency polarization response of a surface-charged oblate
spheroidal particle immersed in an electrolyte solution. Because the charged
spheroid attracts counter-ions 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 counter-ion
distributions in the thin electric double layer limit, we obtain analytic
expressions for the polarization coefficients to the first non-trivial 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 $\zeta$-potential
(surface charge), is suppressed by high ion concentrations in the electrolyte
and depends on the size of the suspended particles. In addition, spheroids with
higher aspect ratios will also lead to a stronger dielectric enhancement due to
the combination of the electric double layer and textural effects. The
characteristic frequency associated with the dielectric enhancement scales
inversely with the square of the particle size, the major radius of the
spheroid, and it has a weak dependence on the shape of spheroids.

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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph