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Author(s): Begoña González
Emilio J. González
Eugénia A. Macedo
Title: Effect of the relative humidity and isomeric structure on the physical properties of pyridinium based-ionic liquids
Issue Date: 2015
Abstract: In this work, the effect of the relative humidity (water coming from the atmosphere and pure water) andisomeric structure on the physical properties of pyridinium-based ionic liquids (ILs) was studied. For thatpurpose, physical properties (density, speed of sound, refractive index and viscosity) of dried andhydrated ILs were measured as a function of temperature at atmospheric pressure. The hydration processwas carried by two ways: (a) leaving the pure ILs for several days in open Petri dishes under controlledtemperature and humidity conditions; and (b) experimental determination of the liquid-liquid equilibrium of binary mixtures {pure water + ionic liquid} at T = 298.15 K. From these data, the influence of thehumidity coming from the atmosphere and pure water on the physical properties of ILs was studied. Thedensity, speed of sound and refractive index data were properly fitted to a linear equation, while viscositydata were fitted to Vogel-Fulcher-Tamman (VFT) equation. Besides, these data were used to calculate thethermal expansion coefficient, the isentropic compressibility and the molar refraction. Moreover, theeffect of the number and position of the alkyl substituents of the ionic liquid on the physical propertieswas also analyzed and discussed. Finally, a comparison with literature data reported for the studied ILswas also carried out.
Subject: Ciências Tecnológicas, Ciências da engenharia e tecnologias
Technological sciences, Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/PEst-C/EQB/LA0020/2013/PROJECTO ESTRATÉGICO - LA 20 - 2013-2014/LA 20
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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