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Issue 34, 2017
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Two coexisting liquid phases in switchable ionic liquids

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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. 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.

Graphical abstract: Two coexisting liquid phases in switchable ionic liquids

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Article information

05 Jun 2017
23 Jun 2017
First published
23 Jun 2017

Phys. Chem. Chem. Phys., 2017,19, 22627-22632
Article type

Two coexisting liquid phases in switchable ionic liquids

J. Yao, D. B. Lao, X. Sui, Y. Zhou, S. K. Nune, X. Ma, T. P. Troy, M. Ahmed, Z. Zhu, D. J. Heldebrant and X. Yu, Phys. Chem. Chem. Phys., 2017, 19, 22627
DOI: 10.1039/C7CP03754F

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