Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanoconfined fluids: Uniqueness of water compared to other liquids   Nanoconfinement can drastically change the behavior of liquids, puzzling us
with counterintuitive properties. Moreover, it is relevant in applications,
including decontamination and crystallization control. It still lacks a
systematic analysis for fluids with different bulk properties. Here we fill
this gap. We compare, by molecular dynamics simulations, three different
liquids in a graphene slit pore: (A) A simple fluid, such as argon, described
by a Lennard-Jones potential; (B) An anomalous fluid, such as a liquid metal,
modeled with an isotropic core-softened potential; (C) Water, the prototypical
anomalous liquid, with directional hydrogen bonds. We study how the slit-pore
width affects the structure, thermodynamics, and dynamics of the fluids. We
check that all the fluids, as expected, show similar oscillating properties by
changing the pore size. However, the nature of the free-energy minima for the
three fluids is quite different: i) only for the simple liquid all the minima
are energy-driven, while their structural order increases with decreasing
slit-pore width; ii) only for the isotropic core-softened potential all the
minima are entropy-driven, while the energy in the minima increases with
decreasing slit-pore width; iii) only the water has a changing nature of the
minima: the monolayer minimum is entropy-driven, at variance with the simple
liquid, while the bilayer minimum is energy-driven, at variance with the other
anomalous liquid. Also, water diffusion has a large increase for sub-nm
slit-pores, becoming faster than bulk. Instead, the other two fluids have
diffusion oscillations much smaller than water slowing down for decreasing
slit-pore width. Our results clarify that nanoconfined water is unique compared
to other (simple or anomalous) fluids under similar confinement, and are
possibly relevant in nanopores applications, e.g., in water purification from
contaminants.

22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph