Abstract
A comprehensive molecular dynamics simulation study of n-alkanes using the optimized potential for liquid simulation with all-atoms (OPLS-AA) force field at ambient condition has been performed. Our results indicate that while simulations with the OPLS-AA force field accurately predict the liquid state mass density for n-alkanes with carbon number equal or less than 10, for n-alkanes with carbon number equal or exceeding 12, the OPLS-AA force field with the standard scaling factor for the 1–4 intramolecular Van der Waals and electrostatic interaction gives rise to a quasi-crystalline structure. We found that accurate predictions of the liquid state properties are obtained by successively reducing the aforementioned scaling factor for each increase of the carbon number beyond n-dodecane. To better understand the effects of reducing the scaling factor, its influence on the torsion potential profile, and the corresponding gauche-trans conformer distribution, heat of vaporization, melting point, and self-diffusion coefficient for n-dodecane were investigated. This relatively simple procedure enables more accurate predictions of the thermo-physical properties of longer n-alkanes.
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Acknowledgments
This work was supported by the US Department of Energy, Office of Nuclear Energy under the Nuclear Energy University Program (DOE-NEUP), contract number: DE-AC07-051D14517. Computing resources used at the Center for Advanced Modeling and Simulation at the Idaho National Laboratory through a collaboration with the Nuclear Energy Advanced Modeling and Simulation program of the Nuclear Energy Office of DOE are greatly appreciated. The Oak Ridge National Laboratory is managed by UT-Battelle, LLC for the DOE under contract No. DE-AC05-00OR22725.
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See supplementary material for mass density, and end-to-end distance for n-decane, n-tetradecane, and n-hexadecane for various scaling factors corresponding to crystalline and disordered state, and comparison of torsion potential profile for n-dodecane for the terminal dihedral: CH3-CH2-CH2-CH2 in gas phase for varying 1–4 intramolecular scaling factor. (DOC 951 kb)
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Ye, X., Cui, S., de Almeida, V.F. et al. Effect of varying the 1–4 intramolecular scaling factor in atomistic simulations of long-chain N-alkanes with the OPLS-AA model. J Mol Model 19, 1251–1258 (2013). https://doi.org/10.1007/s00894-012-1651-5
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DOI: https://doi.org/10.1007/s00894-012-1651-5