Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Irradiated Carbon Nanostructures as Nanoscopic Pressure Cells   High-dose irradiation of nanostructures consisting of multiple graphene
shells, such as spherical 'carbon onions' (CO) or cylindrical multi-walled
carbon nanotubes (MWNT), induces shell shrinkage by bond reconstruction around
irradiation-induced defects. This leads to build-up of internal stresses and to
extreme pressures acting on encapsulated materials or on the carbon cores of
the nanostructures. We formulate a model which relates the build-up of internal
stresses to the point defect dynamics in graphene shells. Calculations are
performed for the special case of irradiated CO. The results are in good
agreement with experimental findings.

10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg