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, 3

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• 作者：Mohammed Taghi Zafarani-Moattar ; Shokat Sarmad
• 关键词：Ionic liquids ; Apparent molar volume ; Isentropic compressibility ; Viscosity B-coefficient ; Interaction parameters
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2012
• 出版时间：November, 2012
• 年：2012
• 卷：54
• 期：Complete
• 页码：192-203
• 全文大小：336 K

文摘

Apparent molar volumes V_?, apparent isentropic compressibilities ¦Ê_?, and viscosity B-coefficients for 1-ethyl-3-methylimidazolium bromide (EmimBr) in aqueous di-potassium hydrogen phosphate (K₂HPO₄) solutions with salt weight fractions (w_s = 0.00, 0.10, 0.15, and 0.20) and potassium di-hydrogen phosphate (KH₂PO₄) solutions with salt weight fractions (w_s = 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: has been used to describe the temperature dependence of the standard partial molar volumes . These results have, in conjunction with the results obtained in pure water, been used to deduce the standard volumes of transfer 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 . 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.