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

Liu, S., Liedel, C., Tarakina, N. V., Osti, N. C., & Akcora, P. (2019). Dynamics of ionic liquids in the presence of polymer-grafted nanoparticles. Nanoscale. doi:10.1039/C9NR04204K.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-627A-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-627B-4
Genre: Journal Article

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 Creators:
Liu, Siqi, Author
Liedel, Clemens1, Author              
Tarakina, Nadezda V.2, Author              
Osti, Naresh C., Author
Akcora, Pinar, Author
Affiliations:
1Clemens Liedel, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2288694              
2Nadezda V. Tarakina, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2522693              

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Free keywords: polymer-grafted nanoparticles, ionic liquid, zwitterionic liquid, solvation, dynamic coupling, quasi-elastic neutron scattering, translational diffusion.
 Abstract: 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 selfdissociate 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 closepacked particles. Translational diffusion dynamics of BMIM-BH3 is not influenced by any particle structures suggesting that zwitterions do not interact with PMMA. 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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 Dates: 2019-07-26
 Publication Status: Published online
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 Identifiers: DOI: 10.1039/C9NR04204K
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Title: Nanoscale
  Abbreviation : Nanoscale
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 2040-3364