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Structure, Dynamics, and Interfacial Behavior in Ionic Liquid-Alcohol Binary Mixtures: A Molecular Dynamics

Maryam Behzadi1, Maryam Heydari Dokoohaki1, Amin Reza Zolghadr1

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Molecular dynamics simulations reveal how cation, anion, and alcohol types affect ionic liquid mixtures. Interactions and mobility change with concentration, influencing bulk and interfacial properties like surface tension.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Ionic liquids (ILs) and alcohol mixtures are crucial in various chemical processes.
  • Understanding their bulk and interfacial properties is key for optimizing applications.
  • Molecular dynamics (MD) simulations offer a powerful tool to study these complex systems at the molecular level.

Purpose of the Study:

  • To elucidate the influence of cation type, anion type, and alcohol type on binary mixtures of ILs and alcohols.
  • To investigate the bulk and interfacial properties of these mixtures across various IL mole fractions.
  • To characterize the structural, dynamic, and surface behavior of IL-alcohol systems.

Main Methods:

  • Conducting molecular dynamics (MD) simulations for IL-alcohol binary mixtures.
  • Varying IL mole fractions and including methanol (MeOH) and butanol (BuOH).
  • Analyzing structural, dynamic, and surface properties using radial distribution functions, density profiles, diffusion coefficients, surface tension, and conductivity.

Main Results:

  • Cation-anion, cation-alcohol, and anion-alcohol interactions strengthen as IL mole fraction decreases.
  • Dominant hydrogen bonding occurs between sulfate anions and alcohol hydroxyl groups.
  • Alcohol molecules show higher mobility than ILs; diffusion coefficients decrease non-linearly with increasing IL mole fraction.
  • Interfacial behavior varies: alcohols are prevalent in the vapor phase at low IL concentrations, while ions enrich the interface at higher concentrations.
  • Surface tension changes depend strongly on IL identity, showing linear trends with MeOH and nonlinear trends with BuOH, indicating aggregation.

Conclusions:

  • The type of ions and alcohol significantly impacts the properties of IL-alcohol mixtures.
  • Interfacial composition and dynamics are sensitive to IL concentration and molecular structure.
  • The observed nonlinear surface tension behavior with butanol suggests micelle formation, critical for designing phase behavior in these systems.