Two coexisting liquid phases in switchable ionic liquids
Abstract
Switchable ionic liquids (SWILs) derived from organic bases and alcohols are attractive due to their applications in gas capture, separations, and nanomaterial synthesis. However, their exact solvent structure still remains a mystery. Here, we present the first chemical mapping of a SWIL solvent structure using in situ time-of-flight secondary ion mass spectrometry. In situ chemical mapping discovers two coexisting liquid phases and molecular structures vastly different from conventional ionic liquids. SWIL chemical speciation is found to be more complex than the known stoichiometry. Dimers and ionic clusters have been identified in SIMS spectra; and confirmed to be the chemical species differentiating from non-ionic liquids via spectral principal component analysis. Our unique in situ molecular imaging has advanced the understanding of SWIL chemistry and how this “heterogeneous” liquid structure may impact SWILs’ physical and thermodynamic properties and associated applications.
- Authors:
-
[1];
[1];
[2];
[4];
[5];
[5];
[3];
[2];
[1]
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Earth and Biological Sciences Directorate
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environment Directorate
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). W. R. Wiley Environmental Molecular Science Lab.
- Idaho State Univ., Pocatello, ID (United States). Dept. Chemistry
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
- OSTI Identifier:
- 1464143
- Grant/Contract Number:
- AC02-05CH11231; AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Chemistry Chemical Physics. PCCP
- Additional Journal Information:
- Journal Volume: 19; Journal Issue: 34; Related Information: © 2017 the Owner Societies.; Journal ID: ISSN 1463-9076
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Yao, Juan, Lao, David B., Sui, Xiao, Zhou, Yufan, Nune, Satish K., Ma, Xiang, Troy, Tyler P., Ahmed, Musa, Zhu, Zihua, Heldebrant, David J., and Yu, Xiao-Ying. Two coexisting liquid phases in switchable ionic liquids. United States: N. p., 2017.
Web. doi:10.1039/c7cp03754f.
Yao, Juan, Lao, David B., Sui, Xiao, Zhou, Yufan, Nune, Satish K., Ma, Xiang, Troy, Tyler P., Ahmed, Musa, Zhu, Zihua, Heldebrant, David J., & Yu, Xiao-Ying. Two coexisting liquid phases in switchable ionic liquids. United States. https://doi.org/10.1039/c7cp03754f
Yao, Juan, Lao, David B., Sui, Xiao, Zhou, Yufan, Nune, Satish K., Ma, Xiang, Troy, Tyler P., Ahmed, Musa, Zhu, Zihua, Heldebrant, David J., and Yu, Xiao-Ying. Fri .
"Two coexisting liquid phases in switchable ionic liquids". United States. https://doi.org/10.1039/c7cp03754f. https://www.osti.gov/servlets/purl/1464143.
@article{osti_1464143,
title = {Two coexisting liquid phases in switchable ionic liquids},
author = {Yao, Juan and Lao, David B. and Sui, Xiao and Zhou, Yufan and Nune, Satish K. and Ma, Xiang and Troy, Tyler P. and Ahmed, Musa and Zhu, Zihua and Heldebrant, David J. and Yu, Xiao-Ying},
abstractNote = {Switchable ionic liquids (SWILs) derived from organic bases and alcohols are attractive due to their applications in gas capture, separations, and nanomaterial synthesis. However, their exact solvent structure still remains a mystery. Here, we present the first chemical mapping of a SWIL solvent structure using in situ time-of-flight secondary ion mass spectrometry. In situ chemical mapping discovers two coexisting liquid phases and molecular structures vastly different from conventional ionic liquids. SWIL chemical speciation is found to be more complex than the known stoichiometry. Dimers and ionic clusters have been identified in SIMS spectra; and confirmed to be the chemical species differentiating from non-ionic liquids via spectral principal component analysis. Our unique in situ molecular imaging has advanced the understanding of SWIL chemistry and how this “heterogeneous” liquid structure may impact SWILs’ physical and thermodynamic properties and associated applications.},
doi = {10.1039/c7cp03754f},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 34,
volume = 19,
place = {United States},
year = {Fri Jun 23 00:00:00 EDT 2017},
month = {Fri Jun 23 00:00:00 EDT 2017}
}
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