Study of solute-solvent interactions between cholinium L-alaninate as a green entrianer and polyethylene glycol dimethyl ether 250 in water medium by measuring of volumetric, acoustic and viscometric properties

Cholinium amino acids ([Ch][AA]) are novel, low toxic and biocompatible ionic liquids (ILs) which are used widely in separation processes. Since, the most of these processes were done in an aqueous media, it is vital to achieve better understanding of the interactions between ILs with polymers in this media for obtaining. In this respect, in this work, we focused our attention on the investigation of physicochemical properties of the cholinium L-alaninate ([Ch][L-Ala]) in water and in aqueous polyethyle glycol dimethyl ether 250 (PEGDME250) solution with different mass fractions 0.025 to 0.075 at T = 298.15 K under atmospheric pressure (≈ 85 kPa). Density (  ), speed of sound (u) and viscosity of the studied aqueous solutions were experimentally measured. The obtained values from the density and acoustic studies were used for computing the limiting values for apparent molarvolume (V 0  ), apparent molar isentropic compressibility (0), and also the transfer molar volume (Δtran V 0  ) and isentropic compressibility (Δtran   ) of [Ch][L-Ala] from water to aqueous BSA solutions. Also, the viscosity values were used for calculating of viscosity B-coefficeint and transfer of viscosity coefficients (Δtran B ). Finally, the solute-solvent interactions in the investigated solutions were evaluated on the basis of changing the above thermodynamic properties from aqueous binary to ternary solutions consist of the [Ch][L-Ala] and PEGDME250.

کلیدواژه ها:

Cholinium L-alaninate ، PEGDME250 ، solute-solvent interaction ، hydration number ، viscosity B-coefficients ، transfer molar volume.