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Accurate SCC-DFTB Parametrization for Bulk Water
journal contribution
posted on 2020-02-21, 20:06 authored by Maicon Pierre Lourenço, Egon Campos dos Santos, Lars G. M. Pettersson, Hélio Anderson DuarteThe SCC-DFTB repulsion
parameters based on the material science
set (matsci) were redesigned to describe the structure
and dynamic properties of bulk liquid water. The iterative Boltzman
inversion (IBI) approach was applied by simultaneously correcting
the O–H and O–O SCC-DFTB repulsion energy contribution
to develop the new water–matsci and water–matsci–UFF set of parameters.
The water–matsci parameters provide O–O and O–H
radial distribution functions in excellent agreement with available
state-of-the-art experimental data. The parametrization is applied
to compute binding energies of a set of water clusters with 2–10
molecules and compared to other DFTB parameters and reference data.
The self-diffusion coefficients of ambient and supercooled (254 K)
water have been estimated and compared to other SCC-DFTB calculated
values and experiment. The performance of the new parameters for describing
the density of ambient water and reactions involving water dissociation
into H3O+ and OH–, the self-diffusion
coefficient, and neutralization energy were investigated. Finally,
we show that the new parametrization can be reliably applied to adsorption
of water on the mineral pyrite by combining the new water–matsci
parameters with the available matsci set of parameters for pyrite.
This opens opportunities for investigating materials and phenomena
of increasing complexity involving water.
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Keywords
self-diffusion coefficientsneutralization energyOHdistribution functionsmineral pyriteH 3 Oambient waterSCC-DFTB repulsion parametersbinding energieswater clustersreference dataiterative Boltzman inversionAccurate SCC-DFTB ParametrizationIBIwater dissociationself-diffusion coefficientDFTB parametersBulk Watermaterial science
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