Dynamics of ionic liquids in the presence of polymer-grafted nanoparticles

Liu, Siqi; Liedel, Clemens; Tarakina, Nadezda V.; Osti, Naresh C.; Akcora, Pinar

doi:10.1039/C9NR04204K

Title: Dynamics of ionic liquids in the presence of polymer-grafted nanoparticles

Journal Article · 26 July 2019 · Nanoscale

DOI: https://doi.org/10.1039/C9NR04204K · OSTI ID:1558495

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Stevens Institute of Technology, Hoboken, NJ (United States)
Max Planck Institute of Colloids and Interfaces, Potsdam (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We incorporated polymer-grafted nanoparticles into ionic and zwitterionic liquids to explore the solvation and confinement effects on their heterogeneous dynamics using quasi-elastic neutron scattering (QENS). 1-Hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIM-TFSI) mixed with deuterated poly(methyl methacrylate) (d-PMMA)-grafted nanoparticles is studied to unravel how dynamic coupling between PMMA and HMIM-TFSI influence the fast and slow diffusion characteristics of the HMIM⁺ cations. The zwitterionic liquid, 1-butyl-3-methyl imidazole-2-ylidene borane (BMIM-BH₃) is critically selected and mixed with PMMA-grafted nanoparticles for comparison in this work as its ions do not self-dissociate and it does not couple with PMMA through ion-dipole interactions as HMIM-TFSI does. We find that long-range unrestricted diffusion of HMIM⁺ cations is higher in well-dispersed particles than in aggregated particle systems, whereas the localized diffusion of HMIM⁺ is measured to be higher in close-packed particles. Translational diffusion dynamics of BMIM-BH₃ is not influenced by any particle structures suggesting that zwitterions do not interact with PMMA. In conclusion, this difference between two ionic liquid types enables us to decouple polymer effects from the diffusion of ionic liquids, which is integral to understand the ionic transport mechanism in ionic liquids confined in polymer-grafted nanoparticle electrolytes.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1558495

Journal Information:: Nanoscale, Vol. 11, Issue 42; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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