Thermodynamics of aqueous solutions of ionic liquids composed of [BMPYR] or [BMIM] cations and tetraflate or dicyanamide anions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F18%3A43915662" target="_blank" >RIV/60461373:22340/18:43915662 - isvavai.cz</a>

Result on the web

<a href="https://ac.els-cdn.com/S0021961418300958/1-s2.0-S0021961418300958-main.pdf?_tid=6c8180ef-cfca-4b03-b4ef-22e1ff61de88&acdnat=1544109308_68c867c6f2b660aaa924d5a9c3d9a46a" target="_blank" >https://ac.els-cdn.com/S0021961418300958/1-s2.0-S0021961418300958-main.pdf?_tid=6c8180ef-cfca-4b03-b4ef-22e1ff61de88&acdnat=1544109308_68c867c6f2b660aaa924d5a9c3d9a46a</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jct.2018.02.017" target="_blank" >10.1016/j.jct.2018.02.017</a>

Result language

angličtina

Original language name

Thermodynamics of aqueous solutions of ionic liquids composed of [BMPYR] or [BMIM] cations and tetraflate or dicyanamide anions

Original language description

This paper explores the thermodynamic behavior of aqueous solutions of four ionic liquids (ILs), namely 1-butyl-1-methylpyrrolidinium dicyanamide [BMPYR][DCA], 1-butyl-3-methylimidazolium dicyanamide [BMIM][DCA], 1-butyl-1-methylpyrrolidinium 1,1,2,2-tetrafluoroethanesulfonate [BMPYR][TFES], and 1-butyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate [BMIM][TFES]. The ionic liquids with [TFES]– anion (tetraflates) have been scarcely researched so far and therefore were characterized here with 1H NMR spectroscopy and DSC calorimetry. In all four systems studied, water activity was systematically measured, the determinations being carried out in the whole composition range and at seven temperatures in the range from 288.15 K to 318.15 K. In addition, the mixing enthalpies in the IL dilute region for (water + DCA IL) systems and the solid-liquid equilibria for (water + TFES IL) systems were experimentally determined. The dependences of activity coefficients on temperature and composition were correlated (i) separately with appropriate flexible equations and (ii) simultaneously with an extended NRTL model. Both correlation approaches provide adequate description of mixture energetics and, as documented by comparisons with other relevant data, allow extrapolations of activity coefficients to both higher and lower temperatures as well as good predictions of excess enthalpy. Furthermore, the volumetric and viscosity behavior of highly dilute solutions of the ILs was explored. The concentration dependences of the apparent volume and viscosity were fitted well by the respective classical Redlich- Meyer and Jones-Dole equations. The values of partial molar volumes at infinite dilution were found to perfectly obey the ion additivity and correlate well with the intrinsic volume of IL molecule. Thermodynamic behavior of studied systems was compared to each other and discussed with respect to molecular interactions and nanostructure as well as to how involved ions affect it.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Chemical Thermodynamics

ISSN

0021-9614

e-ISSN

—

Volume of the periodical

121

Issue of the periodical within the volume

June

Country of publishing house

GB - UNITED KINGDOM

Number of pages

16

Pages from-to

129-144

UT code for WoS article

000428715000015

EID of the result in the Scopus database

2-s2.0-85042481288