Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-05-05
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
19 pages, 7 figures 1 table
Scientific paper
The response of a nanographene sheet to external stresses is considered in terms of a mechanochemical reaction. The quantum chemical realization of the approach is based on a coordinate-of-reaction concept for the purpose of introducing a mechanochemical internal coordinate (MIC) that specifies a deformational mode. The related force of response is calculated as the energy gradient along the MIC, while the atomic configuration is optimized over all of the other coordinates under the MIC constant-pitch elongation. The approach is applied to the benzene molecule and (5, 5) nanographene. A drastic anisotropy in the microscopic behavior of both objects under elongation along a MIC has been observed when the MIC is oriented either along or normally to the C-C bonds chain. Both the anisotropy and high stiffness of the nanographene originate at the response of the benzenoid unit to stress.
Nikitina Ekaterina A.
Popova Nadezhda A.
Popova Vera A.
Shaymardanova Landysh H.
Sheka Elena F.
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