2. Materials and Methods
2.1. Molecular Dynamics Simulations
The non-reactive MD simulations were performed by means of GROMACS-5.1 (devel-
oped by University of Groningen, Royal Institute of Technology and Uppsala University)
program package [
32
]. The armchair nanotubes 3D structures was created with nanotube
builder which is one of the options of VMD software (version 1.9.2, University of Illinois at
Urbana-Champaign, Champaign, IL, USA) (see Figure
1
a,b) [
33
]. The three types of CNTs
were created with the following parameters: CNT1(9:9), CNT2(11:11) and CNT3(13:13). In
our simulations, we used three different model systems MOD1, MOD2 and MOD3, which
contains CNT1, CNT2 and CNT3, respectively. The length of the all CNT’s is the same, i.e.,
3.26 nm, and the radii of the latter differs one to another. The hydrogen atoms were added
to the terminal ends of the CNT using a Jmol software [
34
].
Crystals
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