Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Novel polymer nanocomposite composed of organic nanoparticles via
  self-assembly   We report a novel class of polymer nanocomposite composed of organic
nanoparticles dispersed in polymer matrix, with the particle sizes of 30-120 nm
in radius. The organic nanoparticles were formed by the self-assembly of
protonated poly(4-vinyl-pyridine)-r-poly(acrylonitrile) and amphiphilic metanil
yellow dye molecules through electrostatic interactions in aqueous solution. A
strongly broadened Raman shift band was probed, suggesting the presence of
enhanced optoelectronic property from the polymer nanocomposite. Here, using
random-copolymer polyelectrolytes and mesogenic amphiphiles as the designed
building blocks for self-assembly, a new approach is acutally provided to
fabricate organic nanoparticles.

18
The categories of this paper are: econ
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat