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Excess enthalpy and excess volume for binary systems of two ionic liquids + water

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Abstract

In this work we report the experimental measurements of excess molar enthalpy and excess molar volume, at 298.15 K and atmospheric pressure, on ethylammonium nitrate (EAN) and propylammonium nitrate (PAN) + water mixtures. Positive enthalpies were found for the two systems (maximum, at x 1 around 0.37 correspond to about 700 and 900 J mol−1 for EAN and PAN respectively). As the hydrophobic/hydrophilic ratio increases, along with the length of the alkyl chain in the ionic liquids, ILs, the specific interactions IL-water become less important. The excess molar volumes, V E, are negative over the entire composition range for the two binary mixtures. They have similar values but curves exhibit a different asymmetric shape and around equimolar composition they intersect each other. This behaviour: positive H E and negative V E, is not very common.

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Authors and Affiliations

  1. Dipartimento di Scienze Chimiche, Università degli Studi di Cagliari, Cittadella Universitaria, S.P. Monserrato—Sestu, km 0,700, 09042, Monserrato, CA, Italy

    Silvia Porcedda, B. Marongiu, Manuela Schirru, D. Falconieri & Alessandra Piras

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  1. Silvia Porcedda
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  2. B. Marongiu
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  3. Manuela Schirru
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  4. D. Falconieri
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  5. Alessandra Piras
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Corresponding author

Correspondence to B. Marongiu.

Additional information

This paper is a tribute to Dr. Henry V. Kehiaian from Prof. Bruno Marongiu and coworkers.

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Porcedda, S., Marongiu, B., Schirru, M. et al. Excess enthalpy and excess volume for binary systems of two ionic liquids + water. J Therm Anal Calorim 103, 29–33 (2011). https://doi.org/10.1007/s10973-010-1000-9

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  • DOI: https://doi.org/10.1007/s10973-010-1000-9

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