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Title: Dynamics of a room temperature ionic liquid under applied pressure

Abstract

We report that room temperature ionic liquids (RTILs) have shown great potential in a wide range of applications, especially as novel electrolytes for energy generation. Understanding microscopic dynamics under variable environmental conditions provides critical knowledge of the microscopic interactions in RTILs, which are closely linked to their functionality. Here, we investigate a response of a RTIL, EmimTFSI, to application of a high pressure, up to 1.0 GPa, using quasi-elastic neutron scattering, Raman and X-ray scattering. The ionic liquid transitions from a liquid to a solid state at above ~0.5 GPa and returns to its liquid state following full decompression. However, following such pressure application, the resulting liquid no longer possesses either cations, or anions, as individual entities, as evident from quasi-elastic scattering and Raman scattering results, respectively. We suggest that a possible cause for this behavior could be dimerization of ions, which needs to be considered when designing RTILs for moderate high-pressure applications.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Juelich Center for Neutron Scattering (Germany)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Carnegie Inst. for Sciences, Washington, DC (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1607280
Alternate Identifier(s):
OSTI ID: 1702179
Grant/Contract Number:  
AC05-00OR22725; NA0001974; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Chemical Physics
Additional Journal Information:
Journal Volume: 530; Journal Issue: C; Journal ID: ISSN 0301-0104
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Osti, Naresh C., Haberl, Bianca, Jalarvo, Niina H., Boehler, Reinhard, Molaison, Jamie J., Goyette, Rick J., and Mamontov, Eugene. Dynamics of a room temperature ionic liquid under applied pressure. United States: N. p., 2019. Web. https://doi.org/10.1016/j.chemphys.2019.110628.
Osti, Naresh C., Haberl, Bianca, Jalarvo, Niina H., Boehler, Reinhard, Molaison, Jamie J., Goyette, Rick J., & Mamontov, Eugene. Dynamics of a room temperature ionic liquid under applied pressure. United States. https://doi.org/10.1016/j.chemphys.2019.110628
Osti, Naresh C., Haberl, Bianca, Jalarvo, Niina H., Boehler, Reinhard, Molaison, Jamie J., Goyette, Rick J., and Mamontov, Eugene. Fri . "Dynamics of a room temperature ionic liquid under applied pressure". United States. https://doi.org/10.1016/j.chemphys.2019.110628. https://www.osti.gov/servlets/purl/1607280.
@article{osti_1607280,
title = {Dynamics of a room temperature ionic liquid under applied pressure},
author = {Osti, Naresh C. and Haberl, Bianca and Jalarvo, Niina H. and Boehler, Reinhard and Molaison, Jamie J. and Goyette, Rick J. and Mamontov, Eugene},
abstractNote = {We report that room temperature ionic liquids (RTILs) have shown great potential in a wide range of applications, especially as novel electrolytes for energy generation. Understanding microscopic dynamics under variable environmental conditions provides critical knowledge of the microscopic interactions in RTILs, which are closely linked to their functionality. Here, we investigate a response of a RTIL, EmimTFSI, to application of a high pressure, up to 1.0 GPa, using quasi-elastic neutron scattering, Raman and X-ray scattering. The ionic liquid transitions from a liquid to a solid state at above ~0.5 GPa and returns to its liquid state following full decompression. However, following such pressure application, the resulting liquid no longer possesses either cations, or anions, as individual entities, as evident from quasi-elastic scattering and Raman scattering results, respectively. We suggest that a possible cause for this behavior could be dimerization of ions, which needs to be considered when designing RTILs for moderate high-pressure applications.},
doi = {10.1016/j.chemphys.2019.110628},
journal = {Chemical Physics},
number = C,
volume = 530,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:

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Cited by: 2 works
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