  Recently, laser-assisted chemical vapor deposition was used to synthesize a
free-standing, continuous, and stable monolayer amorphous carbon (MAC). MAC is
a pure carbon structure composed of randomly distributed five, six, seven, and
eight atom rings, which differs from disordered graphene. More recently,
amorphous MAC-based nanotubes (a-CNT) and nanoscrolls (A-CNS) were proposed. In
this work, we have investigated (through fully atomistic reactive molecular
dynamics simulations) the mechanical properties and melting points of pristine
and a-CNT and a-CNS. Results showed that a-CNT and a-CNS have distinct elastic
properties and fracture patterns concerning their pristine analogs. Both a-CNT
and a-CNS presented a non-elastic regime before their total rupture, whereas
the CNT and CNS undergo a direct conversion to fractured forms after a critical
strain threshold. The critical strain for the fracture of the a-CNT and a-CNS
are about 30% and 25%, respectively, and they are lower than the corresponding
CNT and CNS cases. Although less resilient to tension, the amorphous tubular
structures have similar thermal stability in relation to the pristine cases
with melting points of 5500K, 6300K, 5100K, and 5900K for a-CNT, CNT, a-CNS,
and CNS, respectively. An interesting result is whereas the behavior of the
pristine systems is substantially different depending on the system being a
nanotube or a nanoscroll, thus indicating that the topology plays an important
role, the same is not true for the amorphous version of the nanostructures,
thus indicating that the structural disorder overcomes the topological
features.
