Modelization of the H 2 adsorption on graphene and molecular dynamics simulation

In the search for efficient molecular dynamics simulation models both simplicity and acceptable accuracy matter. In the present study, a model of the graphene- H 2 physisorption system is used to explore its performance and limitations under canonical NVT and microcanonical NVE simulation conditions...

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Bibliographic Details
Published in:Theoretical chemistry accounts 2017-08, Vol.136 (8), p.1-9
Main Authors: Faginas-Lago, N, Md Bin Yeamin, Sánchez-Marín, J, Cuesta, I G, Albertí, M, Sánchez de Merás, Alfredo
Format: Article
Language:English
Subjects:
Adsorption
Computer simulation
Graphene
Molecular dynamics
Simulation
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Summary:In the search for efficient molecular dynamics simulation models both simplicity and acceptable accuracy matter. In the present study, a model of the graphene- H 2 physisorption system is used to explore its performance and limitations under canonical NVT and microcanonical NVE simulation conditions. The model implies several simplifications that can be summarized in (a) a single ideal planar frozen graphene-like layer of C atoms, (b) rigid rotor H 2 molecules and (c) interaction potentials written as C–H2 and H 2 – H 2 site–site Improved Lennard-Jones potentials parameterized to reproduce DFT calculations. This model can be used in a variety of molecular dynamics simulation conditions, both in NVT and NVE ensembles. Such simulations lead to the formation of a single layer of adsorbed H 2 molecules in dynamically stable equilibrium with a fluid-phase region. In addition, the incipient formation of secondary layers for high-density conditions is also observed. Some properties as average pressure, temperatures and fluid-phase densities are discussed as well as possible improvements of the model.
ISSN:1432-881X
1432-2234
DOI:10.1007/s00214-017-2110-2