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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 14359
School of Nano Science
  Title:   Molecular dynamics simulation of a graphite-supported copper nanocluster: thermodynamic properties and gas adsorption
  Author(s): 
1 . Seifollah Jalili
2 . C. Mochani
3 . Mojdeh Akhavan
4 . Jeremy Schofield
  Status:   Published
  Journal: Molecular Physics
  No.:  5
  Vol.:  110
  Year:  2012
  Pages:   267�??276
  Publisher(s):   Taylor & Francis
  Supported by:  IPM
  Abstract:
Molecular dynamics simulations were conducted for a cubic Cu cluster supported on a graphite bilayer. The Sutten-Chen and Lennard-Jones potentials were used for metal-metal and metal-graphite interactions, respectively. Heating and cooling processes were performed by NVT simulations at different temperatures in the range 200 to 1800 K. The melting point was identified on the basis of caloric and heat capacity curves. The calculated melting point was 770 K, far below the bulk melting point of crystalline copper. Several phenomena such as the appearance of a hysteresis (irreversibility) in caloric curves, surface melting, and cluster-induced surface wetting were justified from the results. The simulation of cluster in the presence of gas atmosphere showed that the CO gas is adsorbed more than H2 and it has a greater impact on the cluster’s structure.

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