Heijmans K, Tranca IC, Smeulders DMJ, Vlugt TJH, Gaastra-Nedea SV. Gibbs Ensemble Monte Carlo for Reactive Force Fields to Determine the Vapor-Liquid Equilibrium of CO
2 and H
2O.
J Chem Theory Comput 2021;
17:322-329. [PMID:
33350819 PMCID:
PMC7808213 DOI:
10.1021/acs.jctc.0c00876]
[Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
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Absorption and reactive properties
of fluids in porous media are
key to the design and improvement of numerous energy related applications.
Molecular simulations of these systems require accurate force fields
that capture the involved chemical reactions and have the ability
to describe the vapor–liquid equilibrium (VLE). Two new reactive
force fields (ReaxFF) for CO2 and H2O are developed,
which are capable of not only modeling bond breaking and formation
in reactive environments but also predicting their VLEs at saturation
conditions. These new force fields include extra terms (ReaxFF-lg)
to improve the long-range interactions between the molecules. For
validation, we have developed a new Gibbs ensemble Monte Carlo (GEMC–ReaxFF)
approach to predict the VLE. Computed VLE data show good agreement
with National Institute of Standards and Technology reference data
as well as existing nonreactive force fields. This validation proves
the applicability of the GEMC–ReaxFF method to test new reactive
force fields, and simultaneously it proves the applicability to extend
newly developed ReaxFF force fields to other more complex reactive
systems.
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