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Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil

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The CUMULUS coarse graining method: transferable potentials for water and solutes.

Bram van Hoof¹, Albert J Markvoort, Rutger A van Santen

¹Institute for Complex Molecular Systems, Technische Universiteit Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

The Journal of Physical Chemistry. B

|July 12, 2011

Summary

A new coarse-graining method, CUMULUS, creates fixed-composition particles for molecular dynamics simulations. This approach accurately reproduces atomistic data and enables transferable coarse-grained force fields for complex systems.

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Area of Science:

Computational chemistry
Materials science
Molecular modeling

Background:

Molecular dynamics (MD) simulations are crucial for understanding molecular phenomena.
Coarse-grained (CG) models simplify systems by representing atom groups as single particles, enabling larger-scale and longer-time simulations.
Existing multiscale CG methods have limitations in representing particle composition.

Purpose of the Study:

To introduce the CUMULUS coarse-graining method for atomistic simulations.
To develop a systematic approach for incorporating CG solute particles in solutions.
To derive and validate CG force fields for various chemical systems.

Main Methods:

Developed the CUMULUS method for coarse-graining atomistic simulations with fixed-composition CG particles.
Utilized the iterative Boltzmann inversion procedure to derive CG force fields.
Applied the method to systems including pure water, sodium chloride solutions, and water-octanol mixtures.

Main Results:

The CUMULUS method successfully derived CG force fields that accurately reproduce structural information (radial distribution functions) from atomistic simulations.
The derived CG force fields demonstrated transferability to systems with different compositions.
The fixed-composition particle approach systematically accommodates CG solute particles in solutions.

Conclusions:

The CUMULUS method offers a novel and effective approach to coarse-graining atomistic simulations.
This method enhances the accuracy and applicability of CG models, particularly for solutions.
The developed CG force fields show promise for broader applications in molecular simulations.