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Studies of Viscosity Coefficient and Density Properties of Imidazolium Based Ionic Liquids in Aqueous Solutions at Different Temperatures
Author(s) -
Patil Pramod P.,
Shaikh Vasim R.,
Gupta Gaurav R.,
Patil Pankaj D.,
Borse Amulrao U.,
Patil Kesharsingh J.
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800322
Subject(s) - viscosity , ionic liquid , chemistry , aqueous solution , ion , molar volume , bromide , thermodynamics , apparent molar property , relative viscosity , ionic bonding , partial molar property , chloride , analytical chemistry (journal) , inorganic chemistry , chromatography , organic chemistry , physics , catalysis
The densities and viscosity coefficients for binary aqueous solutions of imidazolium based ionic liquids (IL′s), namely 1‐Butyl‐3‐Methylimidazolium Bromide (0.02281 to 0.17232 mol⋅kg ‐1 ) and 1‐Butyl‐3‐Methylimidazolium Chloride (0.01948 to 0.19816 mol⋅kg ‐1 ) have been measured at 293.15, 298.15, and 303.15 K, and at atmospheric pressure, respectively. Using the density data, the apparent molar volumes ( V ϕ ) and partial molar volumes ( V ‾ 2 ) of solutes at finite concentrations and at infinitely dilute solutions ( V ϕ 0 = V ‾ 2 0 ) were estimated. The limiting partial molar volumes of the constituent ions are also reported. The viscosity A, B and D coefficients of Jones‐Dole equation for the studied IL′s are obtained by using viscosity coefficient data. It is observed that viscosity A and B coefficients are positive in magnitude for studied IL′s while the temperature coefficient of B (dB/dT) is of negative, signifying that cations are water structure making ions. The application of Vand's equation to viscosity data and estimation of volume fractions of the solute enabled us to obtain Einstein‐Simha factor and particle interaction coefficient for the ion‐pairs. The analysis of the results indicates that imidazolium cations act as electrostrictive water structure making ions.