Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Like-charge attraction at the nanoscale: ground-state correlations and
  water destructuring   Like-charge attraction, driven by ionic correlations, challenges our
understanding of electrostatics both in soft and hard matter. For two charged
planar surfaces confining counterions and water, we prove that even at
relatively low correlation strength, the relevant physics is the ground-state
one, oblivious of fluctuations. Based on this, we derive a simple and accurate
interaction pressure, that fulfills known exact requirements and can be used as
an effective potential. We test this equation against implicit-solvent Monte
Carlo simulations and against explicit-solvent simulations of cement and
several types of clays. We argue that water destructuring under nanometric
confinement drastically reduces dielectric screening, enhancing ionic
correlations. Our equation of state at reduced permittivity therefore explains
the exotic attractive regime reported for these materials, even in absence of
multivalent counterions.

34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
2
The categories of this paper are: math
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex