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Apparent molar volumes, apparent isentropic compressibilities, and viscosity B-coefficients of 1-ethyl-3-  methylimidazolium bromide in aqueous di-potassium hydrogen phosphate and potassium di-hydrogen phosphate solutions at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K
Physical Chemistry Department, Faculty of Chemistry (Excellence of Science for New Materials and Clean Chemistry) University of Tabriz.
Physical Chemistry Department, Faculty of Chemistry (Excellence of Science for New Materials and Clean Chemistry) University of Tabriz.ORCID iD: 0000-0002-6516-1230
2012 (English)In: Journal of Chemical Thermodynamics, ISSN 0021-9614, E-ISSN 1096-3626, Vol. 54, 192-203 p.Article in journal (Refereed) Published
Abstract [en]

Apparent molar volumes Vϕ, apparent isentropic compressibilities κϕ, and viscosity B-coefficients for 1-ethyl-3-methylimidazolium bromide (EmimBr) in aqueous di-potassium hydrogen phosphate (K2HPO4) solutions with salt weight fractions (ws = 0.00, 0.10, 0.15, and 0.20) and potassium di-hydrogen phosphate (KH2PO4) solutions with salt weight fractions (ws = 0.00, 0.04, 0.07, and 0.10) have been determined from solution density, sound velocity and viscosity measurements at temperatures over the range (298.15 to 318.15) K as function of concentration of 1-ethyl-3-methylimidazolium bromide (EmimBr). In the investigated temperature range, the relation: Vϕ0=a0+a1T+a2T2, has been used to describe the temperature dependence of the standard partial molar volumes Vϕ0. These results have, in conjunction with the results obtained in pure water, been used to deduce the standard volumes of transfer ΔVϕ0 and viscosity B-coefficients of transfer for 1-ethyl-3-methylimidazolium bromide from water to aqueous K2HPO4 and KH2PO4 solutions for rationalizing various interactions in the ternary solutions. The structure making or breaking ability of 1-ethyl-3-methylimidazolium bromide has been discussed in terms of the sign of ∂2Vϕ0∂T2. An increase in the transfer volume of 1-ethyl-3-methylimidazolium bromide with increasing phosphate salts concentration has been explained by Friedman–Krishnan co-sphere model. The activation parameters of viscous flow for the ternary solutions investigated were also determined and discussed by the application of transition state theory.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 54, 192-203 p.
National Category
Engineering and Technology Bio Materials
Research subject
Wood and Bionanocomposites
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URN: urn:nbn:se:ltu:diva-61898DOI: 10.1016/j.jct.2012.03.032OAI: oai:DiVA.org:ltu-61898DiVA: diva2:1073165
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2017-11-24Bibliographically approved

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