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Shear Viscosity of Quasi-Two-Dimensional Ionic Liquids
J D Hernández Velázquez1, A Gama Goicochea1
1Tecnológico de Estudios Superiores de Ecatepec, División de Ingeniería Química y Bioquímica, Tecnológico Nacional de México, 55210 Ecatepec de Morelos, Estado de México, Mexico.
The Journal of Physical Chemistry. B
|April 9, 2025
Summary
This study simulates quasi-two-dimensional ionic liquids (2D ILs), finding that increased particle coupling raises shear viscosity and friction. All systems exhibit shear-thinning and follow universal scaling laws.
Area of Science:
- Materials Science
- Computational Chemistry
- Fluid Dynamics
Background:
- Highly confined ionic liquids (ILs) exhibit unique properties.
- Understanding their rheological behavior is crucial for applications.
Purpose of the Study:
- Investigate shear viscosity (η) and kinetic friction coefficient (μ) in quasi-two-dimensional ILs (2D ILs).
- Analyze the impact of increasing particle coupling (Γ*) on rheological properties under shear flow.
- Explore universal scaling laws governing these properties.
Main Methods:
- Coarse-grained numerical simulations.
- Application of stationary state linear flow at constant temperature.
- Systematic variation of shear rate (γ̇) and coupling constant (Γ*).
Main Results:
- Shear viscosity (η) and friction coefficient (μ) increase with particle coupling (Γ*).
- All simulated 2D IL systems demonstrate shear-thinning behavior.
- Universal scaling laws (η ∼ γ̇ζ, μ ∼ γ̇κ) are observed with κ - ζ = 1.
Conclusions:
- Structural changes in confined ILs significantly influence viscosity and friction.
- The findings align with established rheological scaling principles.
- Predictions offer insights for optimizing ILs in technological applications.
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