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A Simple Two Dimensional Model of Methanol.

Tomislav Primorac1,2, Martina Požar1,3, Franjo Sokolić1

  • 1Faculty of Science, University of Split, Rudjera Boškovića 33, 21000 Split, Croatia.

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Two-dimensional models of methanol, inspired by water models, reveal clustering tendencies and thermodynamic properties. These simulations offer insights into methanol

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Methanol is a simple alcohol with potential as a clean energy carrier.
  • Understanding methanol's molecular behavior is crucial for its applications.
  • Existing models for water, like the Mercedes-Benz model, provide a basis for studying other simple molecules.

Purpose of the Study:

  • To examine simple two-dimensional models of methanol using Monte Carlo simulations.
  • To compare two distinct 2D methanol models (overlapping discs and tangentially fused dimers) with each other and with 3D models.
  • To assess the models' ability to replicate experimental and 3D simulation results for methanol's structure and thermodynamics.

Main Methods:

  • Monte Carlo simulations were employed to study two-dimensional models of methanol.
  • Methanol particles were represented as dimers: a Lennard-Jones disk (methyl group) and a sphere with hydrogen bonding arms (hydroxyl group).
  • Two models were used: Hribar-Lee and Dill's overlapping discs model and a new tangentially fused dimers model.

Main Results:

  • Both 2D methanol models exhibited similar trends in molecular structuring and thermodynamics.
  • At lower temperatures, the smaller model showed spontaneous crystallization, while the larger model displayed metastable states.
  • The 2D models successfully represented the clustering behavior observed in 3D simulations and experimental data.
  • The models qualitatively agreed with bulk methanol properties like density and isothermal compressibility.
  • Heat capacity at constant pressure showed a trend more akin to water's behavior.

Conclusions:

  • Two-dimensional models provide a simplified yet effective platform for studying methanol's physical properties.
  • These models capture essential aspects of methanol's molecular organization and thermodynamic behavior, including the interplay of polar and non-polar interactions.
  • The study highlights the utility of simplified models in understanding complex molecular systems and their potential as energy carriers.