Ritu Maan

Thermophysical properties of alkyl acetates in aqueous solutions of ionic liquid {1-butyl-3-methylimidazolium bromide [bmim][Br]} at different temperatures

The interactions of alkyl esters with the ionic liquid 1-butyl-3-methylimidazolium bromide [bmim][Br] as a function of temperature have been investigated. The density, ρ, and speed of sound, , of alkyl acetates in aqueous 1-butyl-3-methylimidazolium bromide solutions have been measured in the temperature interval T = (288.15, 293.15, 298.15, 303.15 and 308.15) K and atmospheric pressure. The apparent molar volume () and adiabatic compressibility () of alkyl acetates in aqueous ionic liquid solution were determined at the measured temperatures. The partial molar volume and partial molar adiabatic compressibility of esters at infinite dilution have been calculated. Transfer volumes and transfer adiabatic compressibility () at infinite dilution from water to aqueous ionic liquid solution were also calculated and the temperature dependence on the apparent molar volume was used to calculate apparent molar expansivity and the Hepler’s constant values, . The results have been discussed in terms of intermolecular interactions.

Interactional behavior of surface active ionic liquid lauryl isoquinolinium bromide and anionic polyelectrolyte poly(4-styrenesulfonic acid-co-maleic acid) sodium salt in aqueous solution

In the present study, we have reported a detailed assessment of interactional behavior between the surface active ionic liquid (SAIL) lauryl isoquinolinium bromide ([C12iQuin][Br]) and anionic polyelectrolyte poly(4-styrenesulfonic acid-co-maleic acid) sodium salt (PSS-co-MA) in aqueous media. Various techniques such as surface tension, conductance, dynamic light scattering, and turbidity have been employed to get insight into interactions among [C12iQuin][Br] and polyelectrolyte in the interfacial region. Then, surface parameters such as surface excess concentration (Γcmc), surface pressure at interface (Πcmc), minimum area occupied by one molecule of SAIL at air–solvent interface (Αmin), adsorption efficiency (pC20), and surface tension at critical micelle concentration (cmc) (γcmc) have been calculated from tensiometric measurements. Further, thermodynamic parameters, i.e., standard enthalpy of micellization ∆Hm°

Solute–solvent interactions of glycine, l-alanine, and l-valine in aqueous 1-methyl-3-octylimidazolium chloride ionic liquid solutions in the temperature interval (288.15–308.15) K

\left(\Delta {H}_{\mathrm{m}}^{{}^{\circ}}\right)

Densities and Speeds of Sound of Binary Liquid Mixtures of Some n-Alkoxypropanols with Methyl Acetate, Ethyl Acetate, and n-Butyl Acetate at T = (288.15, 293.15, 298.15, 303.15, and 308.15) K

, standard free energy of micellization (∆Gm°

Solute–Solvent Interactions of Alkyl Acetoacetates in Aqueous {1-Butyl-3-methylimidazolium Chloride [bmim][Cl]} Ionic Liquid Solutions in the Temperature Interval (288.15–308.15) K

\Delta {G}_{\mathrm{m}}^{{}^{\circ}}

Volumetric and Ultrasonic Studies of Molecular Interactions in n-Alkoxypropanols + Alkyl Acetates Mixtures at Different Temperatures

), and standard entropy of micellization (∆Sm°