Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Virtual surfaces, director domains and the Freedericksz transition in
  polymer stabilized nematic liquid crystals   The critical field of the Freedericksz transition and switching dynamics are
investigated for polymer stabilized nematic liquid crystals as a function of
polymer concentration. A simple phenomenological model is proposed to describe
the observed critical field and dynamic response time behaviors as a function
of concentration. In this model the polymer fibrils form director domains,
which are bounded by virtual surfaces with a finite anchoring energy. The
Freedericksz transition occurs independently within each of these domains.

35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess