Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Colloidal charge reversal: Dependence on the ionic size and the
  electrolyte concentration   Extensive Monte Carlo simulations and scaling arguments are used to study the
colloidal charge reversal. The critical colloidal surface charge density
$\sigma_c$ at which the reversal first appears is found to depend strongly on
the ionic size. We find that $\sigma_c$ has an inflection point as a function
of the electrolyte concentration. The width of the plateau region in the
vicinity of the inflection point depends on the temperature and the ionic
radius $a$. In agreement with the theoretical predictions it is found that the
critical colloidal charge above which the electrophoretic mobility becomes
reversed diverges as $Z_c \sim 1/a^2$ in the limit $a \to 0$.

14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th