An ab initio molecular dynamics study of benzene in water at supercritical conditions: Structure, dynamics, and polarity of hydration shell water and the solute

2019 ◽  
Vol 151 (4) ◽  
pp. 044508 ◽  
Author(s):  
Ashu Choudhary ◽  
Amalendu Chandra
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Hydration Shell ◽  
Ab Initio Molecular Dynamics ◽  
Supercritical Conditions ◽  
Structure Dynamics

scholarly journals Structure, Dynamics, and Reactivity of Hydrated Electrons by Ab Initio Molecular Dynamics

2011 ◽  
Vol 45 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Ondrej Marsalek ◽  
Frank Uhlig ◽  
Joost VandeVondele ◽  
Pavel Jungwirth
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Ab Initio Molecular Dynamics ◽  
Structure Dynamics ◽  
Hydrated Electrons

scholarly journals CuCl Complexation in the Vapor Phase: Insights from Ab Initio Molecular Dynamics Simulations

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Yuan Mei ◽  
Weihua Liu ◽  
A. A. Migdiov ◽  
Joël Brugger ◽  
A. E. Williams-Jones
Keyword(s):  
Molecular Dynamics ◽  
Water Molecule ◽  
Ab Initio ◽  
Hydration Number ◽  
Hydration Shell ◽  
Md Simulations ◽  
Ab Initio Molecular Dynamics ◽  
Low Density ◽  
Fluid Density ◽  
Hydration Numbers

We investigated the hydration of the CuCl0 complex in HCl-bearing water vapor at 350°C and a vapor-like fluid density between 0.02 and 0.09 g/cm3 using ab initio molecular dynamics (MD) simulations. The simulations reveal that one water molecule is strongly bonded to Cu(I) (first coordination shell), forming a linear [H2O-Cu-Cl]0 moiety. The second hydration shell is highly dynamic in nature, and individual configurations have short life-spans in such low-density vapors, resulting in large fluctuations in instantaneous hydration numbers over a timescale of picoseconds. The average hydration number in the second shell (m) increased from ~0.5 to ~3.5 and the calculated number of hydrogen bonds per water molecule increased from 0.09 to 0.25 when fluid density (which is correlated to water activity) increased from 0.02 to 0.09 g/cm3 (fH2O 1.72 to 2.05). These changes of hydration number are qualitatively consistent with previous solubility studies under similar conditions, although the absolute hydration numbers from MD were much lower than the values inferred by correlating experimental Cu fugacity with water fugacity. This could be due to the uncertainties in the MD simulations and uncertainty in the estimation of the fugacity coefficients for these highly nonideal “vapors” in the experiments. Our study provides the first theoretical confirmation that beyond-first-shell hydrated metal complexes play an important role in metal transport in low-density hydrothermal fluids, even if it is highly disordered and dynamic in nature.

Anisotropic structure and dynamics of the solvation shell of a benzene solute in liquid water from ab initio molecular dynamics simulations

2016 ◽  
Vol 18 (8) ◽  
pp. 6132-6145 ◽  
Author(s):  
Ashu Choudhary ◽  
Amalendu Chandra
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Molecular Dynamics Simulations ◽  
Liquid Water ◽  
Hydration Shell ◽  
Solvation Shell ◽  
Ab Initio Molecular Dynamics ◽  
Anisotropic Structure ◽  
Structure And Dynamics ◽  
Dynamics Simulations

The anisotropic structure and dynamics of the hydration shell of a benzene solute in liquid water have been investigated by means of ab initio molecular dynamics simulations using the BLYP (Becke–Lee–Yang–Parr) and dispersion corrected BLYP-D functionals.

Combustion Driven by Fragment-based Ab Initio Molecular Dynamics Simulation

2019 ◽  
Author(s):  
Liqun Cao ◽  
Jinzhe Zeng ◽  
Mingyuan Xu ◽  
Chih-Hao Chin ◽  
Tong Zhu ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Large Scale ◽  
Methane Combustion ◽  
Combustion Method ◽  
Dynamics Simulation ◽  
Ab Initio Molecular Dynamics ◽  
Computational Time ◽  
Combustion Mechanism ◽  
Daily Lives

Combustion is a kind of important reaction that affects people's daily lives and the development of aerospace. Exploring the reaction mechanism contributes to the understanding of combustion and the more efficient use of fuels. Ab initio quantum mechanical (QM) calculation is precise but limited by its computational time for large-scale systems. In order to carry out reactive molecular dynamics (MD) simulation for combustion accurately and quickly, we develop the MFCC-combustion method in this study, which calculates the interaction between atoms using QM method at the level of MN15/6-31G(d). Each molecule in systems is treated as a fragment, and when the distance between any two atoms in different molecules is greater than 3.5 Å, a new fragment involved two molecules is produced in order to consider the two-body interaction. The deviations of MFCC-combustion from full system calculations are within a few kcal/mol, and the result clearly shows that the calculated energies of the different systems using MFCC-combustion are close to converging after the distance thresholds are larger than 3.5 Å for the two-body QM interactions. The methane combustion was studied with the MFCC-combustion method to explore the combustion mechanism of the methane-oxygen system.

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