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Thermophysical Properties of Two Ammonium-Based Protic Ionic Liquids

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Abstract

Experimental data for density, viscosity, refractive index and surface tension are reported, for the first time, in the temperature range between 288.15 and 353.15 K and at atmospheric pressure for two protic ionic liquids, namely 2-(dimethylamino)-N,N-dimethylethan-1-ammonium acetate, [N11{2(N11)}H][CH3CO2], and N-ethyl-N,N-dimethylammonium phenylacetate, [N112H][C7H7CO2]. The effect of the anion’s aromaticity and the cation’s aliphatic tails on the studied properties is discussed. Additional derived properties, such as isobaric thermal expansion coefficient, surface entropy and enthalpy and critical temperature, were estimated.

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Acknowledgments

This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID /CTM /50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. P.J.C. and A.B. also acknowledge FCT for their post-doctoral grants SFRH/BPD/82264/2011 and SFRH/BPD/77858/2011, respectively. M. G. Freire acknowledges the European Research Council (ERC) for the Starting Grant ERC-2013-StG-337753.

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  1. CICECO - Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal

    Arijit Bhattacharjee, João A. P. Coutinho, Mara G. Freire & Pedro J. Carvalho

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  1. Arijit Bhattacharjee
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  2. João A. P. Coutinho
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Bhattacharjee, A., Coutinho, J.A.P., Freire, M.G. et al. Thermophysical Properties of Two Ammonium-Based Protic Ionic Liquids. J Solution Chem 44, 703–717 (2015). https://doi.org/10.1007/s10953-015-0326-0

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