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Solvation in Ionic Liquids with Polymer-Grafted Nanoparticles.

Siqi Liu¹, Mia Walton¹, Nadezda V Tarakina²

¹Department of Chemical Engineering & Materials Science, Stevens Institute of Technology Hoboken, New Jersey 07030, United States.

The Journal of Physical Chemistry. B

|May 20, 2020

Summary

Polymer-grafted nanoparticles in ionic liquid mixtures enhance ionic conductivity. Higher graft density and specific solvent interactions improve performance, offering insights for advanced electrolyte design.

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Area of Science:

Materials Science
Electrochemistry
Polymer Science

Background:

Ionic liquids (ILs) are promising electrolytes but can suffer from poor solvation.
Polymer-grafted nanoparticles offer tunable interactions within IL-solvent mixtures.
Understanding nanoparticle-IL-solvent interactions is crucial for optimizing ionic conductivity.

Purpose of the Study:

To investigate the ionic conductivity of polymer-grafted nanoparticles in ionic liquid-solvent mixtures.
To explore the influence of polymer graft density and solvent quality on nanoparticle solvation and conductivity.
To elucidate the relationship between polymer-IL interactions and the overall conductive properties of the system.

Main Methods:

Transmission electron microscopy (TEM) for nanoparticle characterization.
Dynamic light scattering (DLS) to assess particle size and swelling.
Electrochemical impedance spectroscopy (EIS) to measure ionic conductivity.

Main Results:

Ionic conductivity was higher in IL-solvent mixtures with polymer-grafted nanoparticles compared to ILs alone.
High graft density of poly(methyl methacrylate) (PMMA) in 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIM-TFSI)-acetonitrile mixtures yielded superior conductivity.
Solubility of PMMA in acetonitrile and specific PMMA-HMIM-TFSI interactions governed particle swelling and solvation.

Conclusions:

Polymer-grafted nanoparticles can enhance ionic conductivity in IL-solvent electrolytes.
Graft density and solvent choice are critical parameters for optimizing solvation and conductivity.
The findings provide a basis for designing advanced electrolytes with tailored nanoparticle-IL interactions.