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Updated: Jul 10, 2026

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

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Molecular dynamics simulation of amorphous SiO2 nanoparticles.

¹Department of Physics, Institute of Technology, National University of HochiMinh City, 268 Ly Thuong Kiet, District 10, HochiMinh City, Vietnam. vvhoang2002@yahoo.com

The Journal of Physical Chemistry. B

|October 20, 2007

Summary

Molecular dynamics simulations reveal that amorphous silicon dioxide (SiO2) nanoparticles exhibit size-dependent structural changes. Oxygen atoms concentrate at the surface, and larger nanoparticles (over 4 nm) maintain a distorted tetrahedral network similar to bulk SiO2.

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Area of Science:

Materials Science
Computational Chemistry
Nanotechnology

Background:

Amorphous silicon dioxide (SiO2) is a critical material in various technological applications.
Understanding the structure and properties of SiO2 nanoparticles is essential for their use in advanced materials.
Previous studies have explored bulk SiO2 and amorphous clusters, but nanoparticle-specific behavior requires detailed investigation.

Purpose of the Study:

To investigate the structural properties of amorphous SiO2 spherical nanoparticles of varying sizes (2, 4, and 6 nm) using molecular dynamics simulations.
To analyze the influence of nanoparticle size on structural characteristics, surface behavior, and network formation.
To compare the structural parameters of nanoparticles with those of bulk SiO2.

Main Methods:

Employing molecular dynamics (MD) simulations with specific interatomic potentials (weak Coulomb and Morse type).
Generating amorphous SiO2 nanoparticle models by cooling from a melt under non-periodic boundary conditions.
Analyzing structural properties using partial radial distribution functions (PRDFs), coordination numbers, bond-angle distributions, and radial density profiles.

Main Results:

A tendency for oxygen atoms to concentrate at the nanoparticle surface was observed, consistent with previous findings in amorphous clusters and thin films.
Significant size-dependent effects on the structure of SiO2 nanoparticles were identified.
Nanoparticles larger than 4 nm exhibited a distorted tetrahedral network structure, with mean coordination numbers (ZSi-O ≈ 4.0, ZO-Si ≈ 2.0) comparable to bulk SiO2.

Conclusions:

The structure of amorphous SiO2 nanoparticles is strongly influenced by their size.
Surface effects, such as oxygen enrichment, play a significant role in the behavior of these nanoparticles.
Larger amorphous SiO2 nanoparticles retain bulk-like structural characteristics, indicating a critical size for surface dominance.