Viscosity Arrhenius activation energy and derived partial molar properties in ofN,N-dimethylacetamide + 2-ethoxyethanol binary mixtures at temperatures from 298.15 K to 318.15 K.

A Novel Approach of Partial Derivatives to Estimate the Normal Boiling Temperature via Viscosity Arrhenius Behaviour in N,N-Dimethylformamide + Ethanol Fluid Systems

“…The A s -values are very close to the shear viscosity of the same system in its vapour-phase at the same pressure and at the normal boiling temperature [20][21][22][23][24][25][26][27]. Thus the high A s -value of DMF, imply that the shear viscosity of DMF at vapour phase is nearly about ten times than of EtOH and it is also concluded that EtOH molecules bounding are more random and disordered in vapour state.…”

“…In the same context, the variation of the activation energy E a versus the molar composition (x 1 ) can give evidence of eventual change or modification in the complex structure or clusters [20] [ formed in binary fluid systems under effect of temperature and/or mixture composition [20][21][22][23][24][25][26][27]. When the activation energy Ea for the full mole compositions in the studied fluid system is depicted in Fig.…”

“…23 to determine these parameters ∆H*and ∆S*. In fact, the plot of R.ln[η·V/(h·N A )] versus the reciprocal of temperature (1/T) is practically linear for the studied mixture and the molar enthalpy (∆H*) and the molar entropy (∆S*) become independent of temperature over the range of temperature (303.15 to 323.15) K. Values of the molar enthalpy (∆H*) and molar entropy (∆S*) are given in Table-3 Correlation between Arrhenius parameters: Generally, investigation of the parameters of Arrhenius [E a and ln(A s )] leads us to spotlight eventual present distinct behaviours which are distinctly shown when the correlation between order and disorder is schematized [20][21][22][23][24][25][26][27] through the activation energy E a of absolute viscosity versus the entropic factor of Arrhenius -R ln(A s ) (Fig. 9).…”

“…from which we can obtain the following limit: Starting from the fact that the reduced RK excess quantities Q Y,exp,T (x 1 ) [20][21][22][23][24][25][26][27] in binary fluid mixtures, gives evidence of some information on the deviation to linearity (or ideality) and from the relationship [28][29][30][31][32][33] between the surface tension (γ), the absolute viscosity (η) and the friccohesity (σ), we can remark that the discussion only on the RK reduced quantities related to the absolute viscosity Q exp,h,T (x 1 =1) [20][21][22][23][24][25][26][27] is insufficient because it implicitly consider different natures of interaction's forces (cohesive and frictional forces, etc.). Then, we must explicit these different manifestations of forces from the surface tension (γ) and the friccohesity (σ) [28][29][30][31][32][33].…”

“…Furthermore, the close dependence on composition, between the molar enthalpy of viscous flow (∆H*) and the viscosity activation energy (Ea) guided to considering that (Ea) is approximately a thermodynamic state function for which partial quantities have been determined to arise individual interaction's contributions of each pure solvent within the fluid mixture for each mole composition and the new given parameter nominated as the current Arrhenius temperature (TAi) related to each pure solvent (i) can provide in a reliable estimation of the boiling point value of the two pure solvents constituting the studied binary fluid mixture [20,21,[44][45][46][47][48][49][50].…”