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We present and discuss the results of explicit - hydrogen Molecular Dynamics computer simulations of tetracosane (C24 H50 ) bi- layers deposited on a graphite substrate in the temperature range 100 K ≤ T ≤ 450 K. Both layers exhibit strong coupling between the internal molecular degrees of freedom and bulk behavior but because of the different boundary conditions between layers, they exhibit dis- tinctly different dynamics and phase transition signatures. Structural, thermodynamic and bond - orientational distributions and parameters are utilized in understanding the solid, intermediate and liquid phases presented in and phase transitions presented by the system.