Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electric double layer in concentrated solutions of ionic surfactants   A simple non-local theoretical model is developed considering concentrated
ionic surfactant solutions as regular ones. Their thermodynamics is described
by the Cahn-Hilliard theory coupled with electrostatics. It is discovered that
unstable solutions possess two critical temperatures, where the temperature
coefficients of all characteristic lengths are discontinuous. At temperatures
below the lower critical temperature ionic surfactant solutions separate into
thin layers of oppositely charged liquids spread across the whole system and
the electric potential is strictly periodic. At temperatures between the two
critical temperatures separation can occur only near the solution surface thus
leading to an oscillatory-decaying electric double layer. At temperatures above
the higher critical temperature as well as in stable solutions there is no
separation and the electric potential decays exponentially.

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The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph