Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure and relaxation processes of an anisotropic molecular fluid
  confined into 1D nanochannels   Structural order parameters of a smectic liquid crystal confined into the
columnar form of porous silicon are studied using neutron scattering and
optical spectroscopic techniques. It is shown that both the translational and
orientational anisotropic properties of the confined phase strongly couple to
the one-dimensional character of the porous silicon matrix. The influence of
this confinement induced anisotropic local structure on the molecular
reorientations occuring in the picosecond timescale is discussed.

12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph