Densities, surface tensions, and derived surface thermodynamics properties of (trimethylbenzene+propyl acetate, or butyl acetate) from T=298.15K to 313.15K

Excess thermodynamic functions derived from densities and surface tensions of (p- or o-xylene+ethylene glycol dimethyl ether) between the temperatures (298.15 and 308.15)K

“…The plot of the surface entropy S r versus composition is also a concave curve, and the minimum S r position is at the equimolar composition due to the formation of DMF-toluene aggregates at surface formation [30]. From the above and our previous results [2], we suggest that if the plot of the surface entropy versus composition is a protruding curve, a physical effect should be dominant in the binary system. However, if the surface entropy versus composition is a concave curve, a chemical hetero-association should take place in the binary system.…”

“…The physical effects and dipolar-dipolar interaction make a negative contribution to the surface tension deviations, but the chemical effects (stronger interactions) make a positive contribution [30]. For the (EGDE + p-xylene) system, the Gibbs adsorption (physical effects) is the dominant effect that results in the decrease of surface tension during mixing, the same phenomenon that was observed in the previous binary systems of xylene or trimethylbenzene [2][3][4][5][6]. Since the value of the surface TABLE 5 Least-squares parameters and standard deviations s for surface tensions from equation (6).…”

“…It is vital for selecting an urging solvent to assess excess functions and to understand the interactions between molecules in the mixtures. In previous papers, densities and surface tensions were measured and the derived excess functions were calculated for the following systems [2][3][4][5][6]: (trimethylbenzene + propyl acetate or butyl acetate), {trimethyl-benzene + ethylene glycol ether (ethylene glycol monomethyl ether or ethylene glycol dimethyl ether)}, (trimethylbenzene + dimethyl carbonate or diethyl carbonate), (xylene or ethylbenzene + propyl acetate), {xylene + alkanone (acetone or 2-butanone)}. Herein, density and surface tension for binary systems of (p-xylene or oxylene + ethylene glycol dimethyl ether) from T = (298.15 to 308.15) K were determined.…”

Preliminary models for viscosity, thermal conductivity, and surface tension of pure fluid constituents of selected diesel surrogate fuels

“…Coefficients for the dilute gas and residual thermal conductivity, Eq. (15) Finally, for surface tension, we fit the experimental data in references (29)(30)(31)(32)(33)(34)(35)(36) to the functional form of Eq. (21); the coefficients are presented in Table 6 with the critical temperature as given in Table 2.…”

“…The estimated uncertainty of the correlation for the liquid phase is the same as the uncertainty of the experimental data, 3 %. 36 …”