Ultrasonic velocity, viscosity, density and excess properties of binary mixture of dimethyl sulphoxide with propanoic acid and n-butyric acid

Excess parameter studies on the binary mixtures of toluene with ketones at different temperatures

“…In the present investigation, the positive trends in DG ÃE indicate the presence of specific interactions between unlike molecules, thereby complimenting the results obtained from volumetric and acoustical studies through Dk s ; Du, and L E f . Similar positive DG ÃE values accounting strong interactions have been reported for (DMSO + propanic acid) and (DMSO + n-butyric acid) binary mixtures by Mishra et al [21].…”

“…The thermodynamic parameters like isentropic compressibility (k s ), intermolecular free length (L f ) and Gibbs free energy of activation (DG * ) are evaluated using the standard relations [20,21]. However, the strength of interactions between the unlike molecules are found to be very sensitive and can be estimated from the excess thermodynamic functions [22,23].…”

Densities and viscosities of binary mixtures of n-decane+1-pentanol, +1-hexanol, +1-heptanol at temperatures from 293.15 to 363.15K and atmospheric pressure

“…For all the mixtures treated here, the value of Δη is negative in the whole composition and temperature intervals. This is an indication of dispersion interactions [33,35,[58][59][60]. The absolute value of Δη decreases as the temperature increases for all the systems.…”

“…From the macroscopic point of view, the positive value of V E for all these mixtures indicates a volume expansion during the mixing dominating the physical interaction. Also, a number of authors have pointed out that the V E behavior of the 1-alcohol + n-alkane mixtures have been described as a balance of a positive and negative contribution [24,25,[56][57][58][59][60] . The positive contribution is due mainly to a partial destruction of the hydrogen bridge bonding structure of the 1-alcohols and also to the fact that the physical contribution from the dispersion interactions between two different molecules are weaker than those between two similar ones.…”

Physico-chemical properties of di-(2-ethylhexyl) phosphoric acid with apolar solvents from ultrasonic studies

“…Various molecular interaction parameters such as acoustic impedance, Z, isentropic compressibility, s , intermolecular freelength, L f , free volume V f , internal pressure, Physics and Chemistry of Liquids 243 i , and viscous relaxation time, , have been evaluated from the measured data using the following standard expressions [19][20][21]:…”