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Published on: May 20, 2014
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Confinement Effects in Dynamics of Ionic Liquids with Polymer-Grafted Nanoparticles
Siqi Liu1, Ruhao Li1, Madhusudan Tyagi2,3
11 Castle Point on Hudson, Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, McLean Hall 415, 07030, Hoboken, NJ, USA.
Summary
Adding polymer-grafted iron oxide nanoparticles to ionic liquids enhances cation diffusion. This effect is linked to particle-induced confinement, shrinking the liquid
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Previous studies showed altered dynamics in ionic liquids with low concentrations of polymer-grafted Fe3O4 nanoparticles.
- This research investigates higher particle concentrations to understand confinement effects on ionic liquid behavior.
Purpose of the Study:
- To investigate the effect of high concentrations of polymer-grafted Fe3O4 nanoparticles on ionic liquid dynamics.
- To analyze the confinement effects on the diffusivity of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIM-TFSI) cations.
Main Methods:
- Quasi-elastic neutron scattering (QENS) was employed to study the dynamics.
- Analysis of the elastic incoherent structure factor (EISF) was used to determine confinement radius.
Main Results:
- Confinement radius decreased with increasing concentrations of grafted Fe3O4 nanoparticles.
- The restricted volume of HMIM-TFSI was found to shrink due to particle-induced confinement.
- Enhanced cation diffusivity was observed, potentially due to local ordering within nanoparticle aggregates.
Conclusions:
- High concentrations of polymer-grafted Fe3O4 nanoparticles induce confinement in ionic liquids.
- This confinement enhances the diffusivity of HMIM-TFSI cations.
- Local ordering of cations within nanoparticle aggregates may explain the enhanced diffusivity.
