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

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-BH 3) 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-BH 3 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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Stevens Institute of Technology, Hoboken, NJ (United States)
  2. Max Planck Institute of Colloids and Interfaces, Potsdam (Germany)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1558495
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Name: Nanoscale; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Liu, Siqi, Liedel, Clemens, Tarakina, Nadezda V., Osti, Naresh C., and Akcora, Pinar. Dynamics of ionic liquids in the presence of polymer-grafted nanoparticles. United States: N. p., 2019. Web. doi:10.1039/C9NR04204K.
Liu, Siqi, Liedel, Clemens, Tarakina, Nadezda V., Osti, Naresh C., & Akcora, Pinar. Dynamics of ionic liquids in the presence of polymer-grafted nanoparticles. United States. doi:10.1039/C9NR04204K.
Liu, Siqi, Liedel, Clemens, Tarakina, Nadezda V., Osti, Naresh C., and Akcora, Pinar. Fri . "Dynamics of ionic liquids in the presence of polymer-grafted nanoparticles". United States. doi:10.1039/C9NR04204K.
@article{osti_1558495,
title = {Dynamics of ionic liquids in the presence of polymer-grafted nanoparticles},
author = {Liu, Siqi and Liedel, Clemens and Tarakina, Nadezda V. and Osti, Naresh C. and Akcora, Pinar},
abstractNote = {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.},
doi = {10.1039/C9NR04204K},
journal = {Nanoscale},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}

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