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. 2020 Oct 19;21(20):7745. doi: 10.3390/ijms21207745

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Plot of the hole volume ( $V_{h}$ ) versus Anion–Cation volume ratio $V_{i o n} (A^{-}) / V_{i o n} (C^{+})$ for the [C₄mim]⁺-based ILs at $T_{k}$ . Data from reference [3,88].