Densities,
ρexp, viscosities, ηexp, and speeds
of sound, c
exp, of pure
heptan-1-ol and 1,4-dioxane and their binary mixtures have been measured
over the entire range of composition at temperatures from (298.15
to 323.15) K with an interval of 5 K and at the atmospheric pressure.
The experimental data have been used to calculate the following: excess
molar volumes, V
m
E, deviation in speeds of sound, Δc, isentropic compressibility, κ
s
, deviation in isentropic compressibility, Δκ
s
, and viscosity deviations, Δη.
The values of V
m
E and Δκ
s
have been found to be positive throughout the composition range
and at all temperatures, whereas Δc and Δη
were negative. The excess or deviation properties (V
m
E, Δc, Δκs, or Δη) have been
correlated using a Redlich–Kister type equation to obtain their
coefficients and standard deviations. The modified Rackett equation
has been employed to correlate with the experimental molar volume
of the component liquids and the binary mixtures. The measured mixture
viscosity data have been correlated using semiempirical models, such
as Andrade/DIPPR and Grunberg–Nissan. The thermodynamic, transport,
and acoustic behaviors have been discussed in terms of the molecular
interactions and structural effects due to the components of the binary
mixtures. Furthermore, the diversity in the thermodynamic or transport
behavior of the binary mixtures of 1,4-dioxane with heptan-1-ol and
other alkan-1-ol systems has been compared and discussed in terms
of the changes in the chain length or the solution properties of the
mixed systems.
