Molecular dynamics simulation study of methanesulfonic acid.

Area of Science:

• Physical Chemistry
• Computational Chemistry
• Materials Science

Background:

• Methanesulfonic acid (MSA) is a key chemical with applications in various industries.
• Understanding its thermodynamic, structural, and dynamical properties is crucial for process optimization.
• Molecular dynamics (MD) simulations offer a powerful tool to investigate these properties at the molecular level.

Purpose of the Study:

• To perform a comprehensive molecular dynamics simulation study of methanesulfonic acid.
• To accurately calculate thermodynamic, structural, and dynamical properties using a reliable force field.
• To analyze the influence of hydrogen bonding on the system's behavior.

Main Methods:

• Employed molecular dynamics (MD) simulations with a validated force field.
• Simulated MSA over a wide temperature range.
• Calculated properties including density, shear viscosity, heat of vaporization, melting temperature, and hydrogen bond lifetimes using continuous and interrupted methodologies.

Main Results:

• MD simulations demonstrated excellent agreement between calculated and experimental data for density, shear viscosity, heat of vaporization, and melting temperature.
• Analysis highlighted the significant role of hydrogen bonds in governing structural and dynamical characteristics.
• Interrupted hydrogen bond lifetimes correlated well with diffusion and viscosity coefficients.
• Activation energies for self-diffusion, reorientational motions, and hydrogen bond lifetimes were found to be coincident.

Conclusions:

• The chosen force field accurately reproduces experimental properties of methanesulfonic acid.
• Hydrogen bonding plays a critical role in the dynamics and structure of MSA.
• MD simulations provide valuable insights into the molecular-level behavior of MSA, aiding in its application and handling.