To study the effects
of type and content of cosolvent as well as
temperature on the properties of two well-known deep eutectic solvents
(DESs), i.e., ChCl/EG (choline chloride + ethylene glycol at a molar
ratio of 1:2) and ChCl/Gly (choline chloride and glycerol at a molar
ratio of 1:2), the density and viscosity of the mixtures of ChCl/EG
or ChCl/Gly with methanol (MeOH) and water (H2O) over the
whole compositional range at temperatures from 288.15 to 323.15 K
as well as the molar enthalpy of mixing for the mixtures of ChCl/EG
or ChCl/Gly + MeOH were experimentally measured. The excess molar
volume, viscosity deviation, and excess molar Gibbs energy of activation
were further calculated to study the effects of temperature, types
of cosolvent and DES, and their contents on the nonideal behavior
of these pseudobinary systems. The molar enthalpy of mixing measured
in this work was further compared with those with H2O as
the cosolvent reported in the literature. It shows that the mixing
of these two DESs with MeOH is exothermic, which is opposite compared
to those mixed with H2O. Additionally, the nonrandom two-liquid
model and Gibbs–Helmholtz equation were combined to represent
the experimental results of the enthalpy of mixing.
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