Molecular Dynamics of Binary Fluids in the Region of the Critical Mixing Point: I. Experimental Fundamentals and the Adjustment of the Lennard-Jones Potential Parameters

1980 ◽  
Vol 9 (3) ◽  
pp. 245-264 ◽  
Author(s):  
Claus Hoheisel
Keyword(s):  
Molecular Dynamics ◽  
Lennard Jones Potential ◽  
Binary Fluids ◽  
Jones Potential ◽  
Lennard Jones ◽  
Potential Parameters ◽  
Critical Mixing

Hydrogen Adsorption of Carbon Nanocone Arrays: Influences of Cone Arrangements

2013 ◽  
Vol 845 ◽  
pp. 345-349
Author(s):  
I Ling Chang ◽  
Ming Liang Liao ◽  
Chi Hsiang Chuang
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Adsorption ◽  
Md Simulations ◽  
Critical Value ◽  
Lennard Jones Potential ◽  
Jones Potential ◽  
Weight Percentage ◽  
Curvature Effects ◽  
Lennard Jones ◽  
Potential Parameters

This paper used molecular dynamics (MD) simulations to investigate influences of cone arrangements (including the cone orientation, arrangement pattern and cone spacing) on hydrogen adsorption of open-tip carbon nanocone (CNC) arrays at temperatures of 100 and 300 K. To consider curvature effects for the cone structure of the CNCs, the curvature-modified Lennard-Jones potential parameters were adopted to describe the interactions between the hydrogen and carbon atoms. It was found that the cone orientation (aligned, opposite, and alternate) does not have obvious influences on hydrogen adsorption of the CNC arrays. The arrangement pattern (square and triangular), however, had significant influences on the hydrogen adsorption. The square-patterned CNC array was noticed to have higher storage weight percentage than the triangular-patterned one. Regarding to the influences of cone spacing, the storage weight percentage grew with the increase of the cone spacing and arrived at a stable value as the cone spacing reached a certain critical value. The influences cone arrangements could be ascribed to repulsive effects, which are evident as cone spacing become narrow.

Surface Tension Evaluation Via Thermodynamic Analysis of Statistical Data From Molecular Dynamics Simulations

Volume 4 ◽  
2004 ◽  
Author(s):  
Aaron P. Wemhoff ◽  
Van P. Carey
Keyword(s):  
Molecular Dynamics ◽  
Surface Tension ◽  
Density Profile ◽  
Md Simulation ◽  
Md Simulations ◽  
Bulk Liquid ◽  
Interfacial Region ◽  
Lennard Jones Potential ◽  
Jones Potential ◽  
Lennard Jones

Surface tension determination of liquid-vapor interfaces of polyatomic fluids using traditional methods has shown to be difficult due to the requirement of evaluating complex intermolecular potentials. However, analytical techniques have recently been developed that determine surface tension solely by means of the characteristics of the interfacial region between the bulk liquid and vapor regions. A post-simulation application of the excess free energy density integration (EFEDI) method was used for analysis of the resultant density profile of molecular dynamics (MD) simulations of argon using a simple Lennard-Jones potential and diatomic nitrogen using a two-center Lennard-Jones potential. MD simulations were also run for an approximation of nitrogen using the simple Lennard-Jones potential. In each MD simulation, a liquid film was initialized between vapor regions and NVE-type simulations were run to equilibrium. The simulation domain was divided into bins across the interfacial region for fluid density collection, and the resultant interfacial region density profile was used for surface tension evaluation. Application of the EFEDI method to these MD simulation results exhibited good approximations to surface tension as a function of temperature for both a simple and complex potential.

Usage of graphics processing units for solving molecular dynamics problems

2011 ◽  
Vol 8 (1) ◽  
pp. 182-188
Author(s):  
D.F. Marin
Keyword(s):  
Molecular Dynamics ◽  
Graphics Processing Units ◽  
Computational Scheme ◽  
Lennard Jones Potential ◽  
Jones Potential ◽  
Lennard Jones ◽  
Graphics Processing ◽  
Dynamics Problems

The paper presents results on performance and efficiency of GPU utilization in a simulation of molecular dynamics processes. The simulation was done with the usage of Lennard-Jones potential and leapfrog computational scheme.

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