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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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Free Volume ( $V_{f}$ ) dependence of inverse of Molar Volume ( $1 / V_{m}$ ) of ILs at 313 K and 0.1 MPa. The data for trihexyl(tetradecyl)phosphonium-based ILs from references [87,88], [C₄mim]⁺-based ILs from [89] and the remaining ILs from [90].