Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mesoscopic theory for size- and charge- asymmetric ionic systems. I.
  Case of extreme asymmetry   A mesoscopic theory for the primitive model of ionic systems is developed for
arbitrary size, $\lambda=\sigma_+/\sigma_-$, and charge, $Z=e_+/|e_-|$,
asymmetry. Our theory is an extension of the theory we developed earlier for
the restricted primitive model. The case of extreme asymmetries
$\lambda\to\infty$ and $Z \to\infty$ is studied in some detail in a mean-field
approximation. The phase diagram and correlation functions are obtained in the
asymptotic regime $\lambda\to\infty$ and $Z \to\infty$, and for infinite
dilution of the larger ions (volume fraction $n_p\sim 1/Z$ or less). We find a
coexistence between a very dilute 'gas' phase and a crystalline phase in which
the macroions form a bcc structure with the lattice constant $\approx
3.6\sigma_+$. Such coexistence was observed experimentally in deionized aqueous
solutions of highly charged colloidal particles.

16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
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The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex