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Updated: May 30, 2026

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
06:37

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

Published on: September 17, 2021

Density-dependent liquid nitromethane decomposition: molecular dynamics simulations based on ReaxFF.

Naomi Rom1, Sergey V Zybin, Adri C T van Duin

  • 1Fritz Haber Research Center for Molecular Dynamics, Hebrew University, Jerusalem 91904, Israel.

The Journal of Physical Chemistry. A
|August 5, 2011
PubMed
Summary
This summary is machine-generated.

Hot liquid nitromethane decomposition pathways shift with compression. At high pressures, H-transfer and N-O bond rupture become dominant, altering reaction dynamics and products.

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Published on: June 8, 2022

Area of Science:

  • Computational Chemistry
  • Chemical Physics
  • Materials Science

Background:

  • Understanding the decomposition of energetic materials like nitromethane (NM) is crucial for safety and performance.
  • The behavior of NM under extreme conditions (high compression and temperature) is not fully understood.
  • Previous studies have explored NM decomposition, but detailed mechanisms at varying compressions require further investigation.

Purpose of the Study:

  • To investigate the decomposition mechanism of hot liquid nitromethane (NM) under varying compression conditions.
  • To identify the key reaction pathways and molecular fragments formed during NM decomposition.
  • To correlate decomposition mechanisms with thermodynamic properties and diffusion dynamics.

Main Methods:

  • Reactive force field (ReaxFF) molecular dynamics simulations were employed.
  • Simulations were conducted at various compression levels relevant to detonation conditions.
  • Analysis focused on bond cleavage, fragment formation, enthalpy changes, and diffusion coefficients.

Main Results:

  • Two distinct decomposition pathways were identified: C-N bond cleavage at low densities and H-transfer/N-O bond rupture at high densities (near Chapman-Jouget conditions).
  • The dominant decomposition mechanism significantly influences kinetic and energetic behavior, as well as product distribution.
  • Density-dependent enthalpy changes correlate with the shift in decomposition mechanisms, serving as a global parameter for reaction dynamics.
  • Atomic diffusion coefficients effectively distinguish between reactive and non-reactive periods.

Conclusions:

  • Compression is a critical factor controlling the decomposition mechanism of hot liquid nitromethane.
  • The observed shift in mechanisms impacts the energetic output and product profile of NM.
  • Enthalpy change and diffusion coefficients are valuable indicators of reaction dynamics in NM decomposition.