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Thermo-physical properties of ammonium-based ionic liquid plus N-methyl-2-pyrrolidone mixtures at 298.15 K
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). University of Cagliari, Italy.
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2014 (English)In: Fluid Phase Equilibria, ISSN 0378-3812, E-ISSN 1879-0224, Vol. 383, 49-54 p.Article in journal (Refereed) Published
Abstract [en]

A systematic study of a series of room-temperature ionic liquids, belonging to the alkylammonium nitrate family (XAN), was carried out at 298.15 K and 0.1 MPa with the aim of investigating the effect of the cationic chain length on some thermo-physical properties and their behavior in the organic solvent N-methyl-2-pyrrolidone (NMP), over the whole concentration range. Experimental densities were used to calculate molar volumes, V-m, and excess molar volumes, V-E. Complementary information was obtained by isothermal titration calorimetry that provided the values of the heat of mixing, H-E, and the excess partial molar enthalpies of each component, (H) over bar (E)(1) and (H) over bar (E)(2). The density values of neat XAN samples decreased as the alkyl chain length of the cation increases, whereas, the addition of the methoxy group to the considered smaller alkyl chain resulted in an increase of density. Negative V-E and H-E values were found for each XAN + NMP system, indicating the presence of strong attracting interactions between the constituents.

Place, publisher, year, edition, pages
2014. Vol. 383, 49-54 p.
Keyword [en]
Ionic liquid, N-methyl-2-pyrrolidone, Density, Molar excess volume, Molar excess enthalpy
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-111394DOI: 10.1016/j.fluid.2014.09.031ISI: 000345729100008OAI: oai:DiVA.org:su-111394DiVA: diva2:775809
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AuthorCount:7;

Available from: 2015-01-05 Created: 2015-01-02 Last updated: 2017-12-05Bibliographically approved

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