Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ion and site correlations of charge regulating surfaces: a simple and
  accurate theory   Charge regulation is a fundamental mechanism in most chemical, geochemical,
and biochemical systems. Various minerals surfaces and proteins are well-known
to change their charge state as a function of the activity of the hydronium
ions, i.e., the pH. Besides being modulated by the pH, the charge state is
sensitive to salt concentration and composition due to screening and ion
correlations. Given the importance of electrostatic interactions, a reliable
and straightforward theory of charge regulation would be of utmost importance.
This paper presents such a theory that accounts for salt screening, site and
ion correlations. Our approach shows an impeccable agreement compared to Monte
Carlo simulations and experiments of 1:1 and 2:1 salts. We furthermore
disentangle the relative importance of site-site, ion-ion and ion-site
correlations. Contrary to previous claims, we find that ion-site correlations
are subdominant to the two other correlation terms.

33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con