首页> 美国政府科技报告 >First Principles Calculations of the Adsorption of Nitromethane and 1,1- Diamino-2,2-dinitroethylene (FOX-7) Molecules on Al2O3(0001) Surface
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First Principles Calculations of the Adsorption of Nitromethane and 1,1- Diamino-2,2-dinitroethylene (FOX-7) Molecules on Al2O3(0001) Surface

机译:硝基甲烷和1,1-二氨基-2,2-二硝基乙烯(FOX-7)分子在al2O3(0001)表面吸附的第一性原理计算

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First-principles calculations based on density functional theory (DFT) and the generalized gradient approximation (GGA) have been used to study the adsorption of nitromethane (NM) and 1,1-diamino-2,2-dinitroethylene (FOX-7) molecules on the basal plane of an alpha-Al2O3 crystal. The calculations employ a (2x2) supercell slab model and 3D periodic boundary conditions. Based on these calculations we have determined that both NM and FOX-7 molecules can adsorb nondissociatively on the surface with the most stable adsorption configurations parallel to the surface. The binding energies are in the range 25.3-26.0 kcal/mol for NM and 35.6-48.3 kcal/mol for FOX-7 depending on the relative molecular orientation and the surface sites. The minimum energy pathways for NM dissociation have been determined and a low energy pathway leading to H-atom elimination with formation of adsorbed CH2NO2 and hydroxyl species has been identified. Additional calculations have focused on adsorption properties of aci-nitromethane tautomers and on description of the energetic pathways connecting adsorbed nitromethane molecule with these tautomers.

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