Structure, Dynamics, and Interfacial Behavior in Ionic Liquid-Alcohol Binary Mixtures: A Molecular Dynamics
Maryam Behzadi1, Maryam Heydari Dokoohaki1, Amin Reza Zolghadr1
1Department of Chemistry, School of Science, Shiraz University, Shiraz 71946-84795, Iran.
The Journal of Physical Chemistry. B
|October 18, 2025
Summary
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.
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.
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