Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Molecular dynamics of n-hexane: A quasi-elastic neutron scattering study
  on the bulk and spatially nanochannel-confined liquid   We present incoherent quasi-elastic neutron scattering measurements in a
wavevector transfer range from 0.4 AA^{-1} to 1.6AA^{-1} on liquid n-hexane
confined in cylindrical, parallel-aligned nanochannels of 6 nm mean diameter
and 260 micrometer length in monolithic, mesoporous silicon. They are
complemented with, and compared to, measurements on the bulk system in a
temperature range from 50K to 250K. The time-of-flight spectra of the bulk
liquid can be modeled by microscopic translational as well as fast localized
rotational, thermally-excited, stochastic motions of the molecules. In the
nano-confined state of the liquid, which was prepared by vapor condensation, we
find two molecular populations with distinct dynamics, a fraction which is
immobile on the time scale of 1ps to 100ps probed in our experiments and a
second component with a self-diffusion dynamics slightly slower than observed
for the bulk liquid. No hints of an anisotropy of the translational diffusion
with regard to the orientation of the channels' long axes have been found. The
immobile fraction amounts to about 5% at 250K, gradually increases upon cooling
and exhibits an abrupt increase at 160K (20K below bulk crystallization), which
indicates pore freezing

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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
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The categories of this paper are: eess
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom