Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Slow Kinetics of Capillary Condensation in Confined Geometry: Experiment
  and Theory   When two solid surfaces are brought in contact, water vapor present in the
ambient air may condense in the region of the contact to form a liquid bridge
connecting the two surfaces : this is the so-called capillary condensation.
This phenomenon has drastic consequences on the contact between solids,
modifying the macroscopic adhesion and friction properties. In this paper, we
present a survey of the work we have performed both experimentally and
theoretically to understand the microscopic foundations of the kinetics of
capillary condensation. From the theoretical point of view, we have computed
the free energy barrier associated with the condensation of the liquid from the
gas in a confined system. These calculations allow to understand the existence
of very large hysteresis, which is often associated with capillary
condensation. This results are compatible with experimental results obtained
with a surface forces apparatus in a vapor atmosphere, showing a large hysteris
of the surface energy of two parallel planes as a function of their distance.
In the second part, we present some experiments on the influence of humidity on
the avalanche angle of granular media. We show that the ageing in time of this
avalanche angle can be explained by the slow kinetics of capillary condensation
in a random confined geometry.

18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: eess
37
The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph