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• W2203776912 abstract "We studied silica dimerization reactions in the gas and aqueous phase by density functional theory (DFT) and reactive force fields based on two parameterizations of ReaxFF. For each method (both ReaxFF force fields and DFT), we performed constrained geometry optimizations, which were subsequently evaluated in single point energy calculations using the other two methods. Standard fitting procedures typically compare the force field energies and geometries with those from quantum mechanical data after a geometry optimization. The initial configurations for the force field optimization are usually the minimum energy structures of the ab initio database. Hence, the ab initio method dictates which structures are being examined and force field parameters are being adjusted in order to minimize the differences with the ab initio data. As a result, this approach will not exclude the possibility that the force field predicts stable geometries or low transition states which are realistically very high in energy and, therefore, never considered by the ab initio method. Our analysis reveals the existence of such unphysical geometries even at unreactive conditions where the distance between the reactants is large. To test the effect of these discrepancies, we launched molecular dynamics simulations using DFT and ReaxFF and observed spurious reactions for both ReaxFF force fields. Our results suggest that the standard procedures for parameter fitting need to be improved by a mutual comparative method." @default.
• W2203776912 created "2016-06-24" @default.
• W2203776912 creator A5003335206 @default.
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• W2203776912 creator A5085566730 @default.
• W2203776912 date "2015-11-12" @default.
• W2203776912 modified "2023-10-06" @default.
• W2203776912 title "A test on reactive force fields for the study of silica dimerization reactions" @default.
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• W2203776912 doi "https://doi.org/10.1063/1.4935179" @default.
• W2203776912 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26567652" @default.
• W2203776912 hasPublicationYear "2015" @default.
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