scholarly journals Structure Analysis of Amorphous and Liquid Magnesium Silicate

2021 ◽  
Vol 37 (1) ◽  
Author(s):  
Mai Thi Lan ◽  
Nguyen Thi Thao
Keyword(s):  
Molecular Dynamics ◽  
Boundary Condition ◽  
Distribution Function ◽  
Molecular Dynamics Simulation ◽  
Radial Distribution ◽  
Magnesium Silicate ◽  
Distribution Functions ◽  
Dynamics Simulation ◽  
Radial Distribution Functions ◽  
The One

We use the Oganov potentials and period boundary condition to perform molecular dynamics simulation of amorphous and liquid Mg2SiO4 systems under pressures 0 GPa and 40 GPa. We clarify structure of amorphous Mg2SiO4 at 0 and 40 GPa and compared with the one of Mg2SiO4 at liquid state. Especially, the origin of sub-peaks in radial distribution function of O-O, Si-Si and Mg-Mg pairs is explained clearly. The change of radial distribution functions, coordination number and the number of all types of bonds including the corner-, edge- and face-sharing bonds is also discussed in detail in this paper.

Molecular Dynamics Study of the Structural and Dynamical Properties of Liquid Tetrahydrofuran

1990 ◽  
Vol 45 (11-12) ◽  
pp. 1342-1344 ◽  
Author(s):  
W. Drabowicz
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Radial Distribution ◽  
Distribution Functions ◽  
Dynamics Simulation ◽  
Radial Distribution Functions ◽  
Frequency Spectra ◽  
Autocorrelation Functions ◽  
Dynamical Properties

AbstractA molecular dynamics simulation has been performed to investigate the structural and dynamical properties of liquid tetrahydrofuran. In particular, we have calculated six radial distribution functions, translational and rotational autocorrelation functions and their associated frequency spectra.

scholarly journals The Thermal Agitated Phase Transitions on the Ti32 Nanocluster: a Molecular Dynamics Simulation Study

2021 ◽  
Vol 74 ◽  
Author(s):  
Tshegofatso M. Phaahla ◽  
Alexey A. Sokol ◽  
Charles R.A. Catlow ◽  
Scott M. Woodley ◽  
Phuti E. Ngoepe ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Diffusion Coefficient ◽  
Phase Transitions ◽  
Molecular Dynamics Simulation ◽  
Melting Point ◽  
Radial Distribution ◽  
Simulation Software ◽  
Distribution Functions ◽  
Dynamics Simulation ◽  
Radial Distribution Functions

ABSTRACT Molecular dynamics simulations were performed to investigate the stability with respect to increasing the simulated temperature from 300 to 2400 K of an isolated cluster composed of 32 titanium atoms. The interatomic interactions were modelled using Gupta potentials as implemented within the classical molecular dynamics simulation software DL_POLY. The radial distribution functions (RDF), diffusion coefficient, and density profiles were examined to study the structural changes as a function of temperature. It was found that the Ti32 nanocluster exhibits temperature structural transition. The icosahedron and pentagonal bi-pyramid structures were found to be the most dominant building block fragments. Deformation of the nanocluster was also measured by diffusion coefficient, and it was found that the Ti32 are mobile above the bulk melting point. The phase transitions from solid to liquid have been identified by a simple jump in the total energy curve, with the predicted melting temperature near the bulk melting point (1941.15 K). As expected, the RDF's and density profile peaks decrease with increasing temperature. Keywords: Molecular dynamics, titanium cluster, radial distribution functions, diffusion coefficient, mean square displacement.

scholarly journals Molecular dynamics simulation of an aqueous Na2SO4 solution

2018 ◽  
Vol 72 (2) ◽  
pp. 67 ◽  
Author(s):  
Krzysztof Nieszporek ◽  
Jolanta Nieszporek
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bond ◽  
Molecular Dynamics Simulation ◽  
Sodium Sulfate ◽  
Water Solution ◽  
Distribution Functions ◽  
Dynamics Simulation ◽  
Geometrical Parameters ◽  
Radial Distribution Functions ◽  
Hydration Shells

<p>The structure of sodium sulfate in tip3p water solution with the concentration of 0.1191 mol/dm<sup>3</sup> was studied by means of classical molecular dynamics. Both ions have clear hydration shells. The comparison between radial distribution functions and cumulative numbers of selected atoms around the reference one makes it possible to precisely describe the structure of investigated system. Applying such tools geometrical parameters of the hydrogen bond of the dimer SO<sub>4</sub><sup>2-</sup>/H<sub>2</sub>O have been obtained.</p><p> </p>

scholarly journals Dynamic and Static Properties of Aqueous NaCl Solutions at 25°C as a Function of NaCl Concentration: A Molecular Dynamics Simulation Study

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Song Hi Lee
Keyword(s):  
Molecular Dynamics ◽  
Radial Distribution ◽  
Dynamic Properties ◽  
Md Simulations ◽  
Distribution Functions ◽  
Molar Conductivity ◽  
Dynamics Simulation ◽  
Radial Distribution Functions ◽  
Deep Minimum ◽  
Nacl Concentration

We present the result of molecular dynamics (MD) simulations to calculate the molar conductivity Λ m =   λ N a + +   λ C l − of NaCl in SPC/E water at 25°C as a function of NaCl concentration (c) using Ewald sums employing a velocity Verlet algorithm. It is found that the MD result for Λm with Ewald sum parameter κ = 0.10 Å−1 gives the closest one to the experimental data and that the obtained radial distribution functions g i i (r) with κ = 0.10 Å−1 show a dramatic change with a very deep minimum of g NaCl (r) and, as a result, sharp maxima of g NaNa (r) and g ClCl (r) at the distance 9.95 Å, which indicates a characteristic of ionic atmosphere, the basis of the Debye–Hückel theory of ionic solutions. The static and dynamic properties of NaCl (aq) solutions are analyzed in terms of radial distribution functions, hydration numbers, coordination numbers around Na+ and Cl−, residence times of water around Na+ and Cl−, water diffusion, and ion-ion electrostatic energies to explain the behavior of the molar conductivity Λm of NaCl obtained from our MD simulations.

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