Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Role of defect healing on the chirality of single-wall carbon nanotubes   Although significant efforts have been directed towards a selective single
wall carbon nanotube synthesis, the resulting diameter and chirality
distributions are still too broad and their control remains a challenge.
Progress in this direction requires an understanding of the mechanisms leading
to the chiral selectivity reported by some authors. Here, we focus on one
possible such mechanism and investigate the healing processes of defective
tubes, at the atomic scale. We use tight-binding Monte Carlo simulations to
perform a statistical analysis of the healing of a number of defective tubes.
We study the role of temperature as a primary factor to overcome the energy
barriers involved by healing, as well as the role of the metal catalyst. Using
both electron diffraction patterns and local characterizations, we show that
the healing proceeds first along the tube axis, before spreading laterally, and
observe the competition between two or more chiralities. The resulting picture
is that no chirality seems to be favored by the healing mechanisms, implying
that the reported chiral preference should result from other sources.

18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph