Water in the subcritical and supercritical states has remarkable properties that make it an excellent solvent for oxidation of hazardous chemicals, waste separation, and green synthesis. Molecular simulations are a valuable complement to experiments in order to understand and improve the relevant sub- and super-critical reaction mechanisms. Since water molecules under these conditions can act not only as a solvent but also as a reactant, dissociative force fields are especially interesting to investigate these processes. In this work, we evaluate the capacity of the ReaxFF force field to reproduce the microstructure, hydrogen bonding, dielectric constant, diffusion, and proton transfer of sub- and super-critical water. Our results indicate that ReaxFF is able to simulate water properties in these states in very good quantitative agreement with the existing experimental data, with the exception of the static dielectric constant that is reproduced only qualitatively.
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21 June 2018
Research Article|
June 18 2018
Benchmark of ReaxFF force field for subcritical and supercritical water
Hegoi Manzano
;
Hegoi Manzano
a)
1
Department of Condensed Matter Physics, University of the Basque Country UPV/EHU
, Barrio Sarriena s/n, 48940 Leioa, Spain
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Weiwei Zhang
;
Weiwei Zhang
2
Department of Mechanical and Nuclear Engineering, Pennsylvania State University
, University Park, Pennsylvania 16802, USA
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Muralikrishna Raju
;
Muralikrishna Raju
3
Department of Mechanical Engineering, Stanford University
, Stanford, California 94305, USA
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Jorge S. Dolado;
Jorge S. Dolado
4
CiTG, TU
, Delft, The Netherlands
; Tecnalia Research and Innovation, Materials, Sustainable Construction Division
, Donostia, Spain
; and Donostia International Physics Center
, Donostia, Spain
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Iñigo López-Arbeloa;
Iñigo López-Arbeloa
5
Department of Physical Chemistry, University of the Basque Country UPV/EHU
, Barrio Sarriena s/n, 48940 Leioa, Spain
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Adri C. T. van Duin
Adri C. T. van Duin
2
Department of Mechanical and Nuclear Engineering, Pennsylvania State University
, University Park, Pennsylvania 16802, USA
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a)
Electronic mail: hegoi.manzano@ehu.eus
J. Chem. Phys. 148, 234503 (2018)
Article history
Received:
March 30 2018
Accepted:
May 28 2018
Citation
Hegoi Manzano, Weiwei Zhang, Muralikrishna Raju, Jorge S. Dolado, Iñigo López-Arbeloa, Adri C. T. van Duin; Benchmark of ReaxFF force field for subcritical and supercritical water. J. Chem. Phys. 21 June 2018; 148 (23): 234503. https://doi.org/10.1063/1.5031489
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