Binary Mixture of Double Protic Ionic Liquid: Density, Viscosity, Refractive Index, Surface Tension, and Derivative Properties

• Published in: Journal of chemical and engineering data Vol. 66; no. 12; pp. 4309 - 4325
• Main Authors: Buarque, Filipe S, Camêlo, Lídia C. A, Soares, Cleide M. F, Mattedi, Silvana, Ferreira, Ailton F. B, Feitosa, Filipe X, Souza, Ranyere L, de Sant’Ana, Hosiberto B, Lima, Álvaro S
• Format: Journal Article
• Language: English
• Published: American Chemical Society 09-12-2021
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/acs.jced.1c00429

This work presents density (ρ), dynamic viscosity (η), refractive index (nD ), and surface tension (γ) experimental data for three pure protic ionic liquids: 2-hydroxyethylammonium acetate ([2-HEA]­[Ac]), bis­(2-hydroxyethyl)­ammonium acetate ([BHEA]­[Ac]), and bis­(2 hydroxyethyl)­ammonium butyric ([BHEA]­[Bu]), along with experimental data for two binary systems, as follows: ([2-HEA]­[Ac] + [BHEA]­[Ac]) and ([2-HEA]­[Ac] + [BHEA]­[Bu]), at a temperature range of T = 278.15 to 343.15 K and atmospheric pressure (101.3 kPa). For the ([2-HEA]­[Ac] + [BHEA]­[Ac]) binary system, excess volume and refractive index deviation values are negative, while for the ([2-HEA]­[Ac] + [BHEA]­[Bu]) binary system are positive. For the first, there is a volume contraction, with higher probability of ion interactions. For the latter system, an expansive trend and lower ion interactions were found when compared to the ([2-HEA]­[Ac] + [BHEA]­[Ac]) system. Viscosity deviations values show a negative behavior for both binary systems studied. These results could indicate the predominance of dispersive forces. Furthermore, for the [2-HEA]­[Ac] + [BHEA]­[Ac] system, surface tension deviation values are positive. On the other hand, for the [2-HEA]­[Ac] + [BHEA]­[Bu] system this derivative property are negative. From these results, the [2-HEA]­[Ac] + [BHEA]­[Ac] binary system could be characterized by presenting prevalent dispersion forces and an unequal distribution of the mixture components between the bulk and interface.