Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanoconfined Polystyrene: A New Phase   Transverse layering of molecular gyration spheres in spin-coated atactic
polystyrene ($aPS$) films, for film thickness $R \leq$ 4$R_g$ ($R_g$ =
unperturbed gyration radius), causes an increase in free energy that does not
follow the $(R_g/R)^{-2}$ dependence of planar confinement and is explained by
invoking a fixed-range, repulsive, modified P\"{o}schl-Teller intermolecular
potential, its strength decreasing with increase in $R$. Vacuum ultraviolet
spectroscopy reveals a change in 'physical dimers' of adjacent pendant benzene
rings of $aPS$ from 'oblique' to 'head-to-tail' configuration as film thickness
goes from 9$R_{g}$ to 2$R_{g}$. This reduces cohesion by reducing dimer dipole
moment. Thus a new phase of $aPS$, the nanoconfined phase, ordered but with
lower cohesion than bulk, is formed.

24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn