Densities, Viscosities, and Electrical Conductivities
of Pure Anhydrous Reline and Its Mixtures with Water in the Temperature
Range (293.15 to 338.15) K
Version 3 2019-08-26, 19:05
Version 2 2019-08-23, 18:39
Version 1 2019-06-05, 13:08
Posted on 2019-08-26 - 19:05
Density
(ρ), dynamic viscosity (η), and electrical
conductivity (κ) of the deep eutectic solvent (DES) reline,
composed of choline chloride (ChCl) and urea in a 1:2 molar ratio,
and its mixtures with water, covering the entire miscibility range,
were studied at T = (293.15 to 338.15) K. Compared
to many previous studies, reline purity was significantly improved
by using ultrapure urea and ChCl recrystallized from ethanol. For
the investigated DES samples the mass fraction of residual water was
<0.00035. This allowed checking the influence of water traces and
impurities on the physicochemical properties of pure reline. It was
found that the presence of small amounts of water (w(H2O) < 0.0081) only negligibly decreased reline density,
not exceeding 0.14% compared to the dry sample. However, for the same
amount of water η decreased by ∼36% at 298.15 K. The
temperature dependence of ρ was well fitted by a quadratic expression,
whereas η(T) and κ(T) were found to follow the empirical Vogel–Fulcher–Tammann
equation. For the aqueous mixtures excess properties of molar volume
(VE) and viscosity (ηE) showed only minor variation with composition, suggesting rather
weak interactions between water and the constituents of reline. However, VE and ηE depended significantly
on temperature, indicating a significant contribution of H-bonding
to the inherent reline structure. Similar to conventional ionic liquids,
the conductivity of aqueous reline showed a broad maximum at the reline
mole fraction of x1 ≈ 0.18 associated
with the border between aqueous solutions of individual reline components
and reline/water mixtures. The Walden plot classifies reline as a
poor ionic liquid.
CITE THIS COLLECTION
DataCite
3 Biotech
3D Printing in Medicine
3D Research
3D-Printed Materials and Systems
4OR
AAPG Bulletin
AAPS Open
AAPS PharmSciTech
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg
ABI Technik (German)
Academic Medicine
Academic Pediatrics
Academic Psychiatry
Academic Questions
Academy of Management Discoveries
Academy of Management Journal
Academy of Management Learning and Education
Academy of Management Perspectives
Academy of Management Proceedings
Academy of Management Review
Agieienko, Vira; Buchner, Richard (2019). Densities, Viscosities, and Electrical Conductivities
of Pure Anhydrous Reline and Its Mixtures with Water in the Temperature
Range (293.15 to 338.15) K. ACS Publications. Collection. https://doi.org/10.1021/acs.jced.9b00145
or
Select your citation style and then place your mouse over the citation text to select it.