摘要:

The1H-NMR spectra of liquid binary mixtures N-methylformamide (NMF) - N, N-dimethylformamide (DMF), were recorded at 298 K within nearly the whole range of mixed solvent compositions. From these data were found the values of the spectral structural parameter, ΔΔ(NMF - DMF). The viscosities (η12) of the mixed solvents were measured at 298.15 K, as well as the relative permittivities (ϵ12) and the surface tensions (σ12) at 291.15 K, 298.15 K and 303.15 K. From all these data their deviations from ideality were calculated. Additionally, the temperature coefficients of relative permittivity, α12=1/α12[dϵ12/d(1/T)] and temperature coefficients of surface tensions, γ12=-(σ12/dT), were found. These quantities, as a function of a mole fraction, deviate very little from their molar values, indicating that the mixtures of NMF - DMF can be regarded as almost ideal.

ISSN:0031-9104    

DOI:10.1080/00319109808030603

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Enthalpies of mixing HMmhave measured for binary mixtures of tetrachloroethylene with six alkan–1–ols (propan–1–ol, butan-1–ol, pentan–1–ol, hexan–1–ol, heptan–l–ol and octan–l–ol) at 298.15 K using a Parr 1451 solution calorimeter. All the studied mixtures present exothermic event and showed minimum negative HMmvalues in mixtures from propan–1–ol to octan–1–ol in mixtures rich in tetrachloroethylene region around 0.65–0.70 mole fraction. The mixing HMmvalues increases with the chain length of alkan–1–ols. The experimental data explained in term of dissociation of self–associated alkan–1–mols and tetrachloroethylene.

ISSN:0031-9104    

DOI:10.1080/00319109808030604

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The gas chromatographic method proposed by us for simple and accurate measurement of isothermal phase equilibria has been applied to: aliphatic alcohol (n-butanol andn-pentanol)+alkylbenzene (benzene, toluene,o-xylene,p-xylene and ethylbenzene) binary mixtures. The present measurements on: benzene withn-butanol, and toluene withn-butanol andn-pentanol are in good agreement with the isothermal phase equilibrium data available in the literature.

ISSN:0031-9104    

DOI:10.1080/00319109808030605

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

It is also shown from existing experimental data that there is a correlation betweenEAmaxand the width of the optical absorption spectrum, which depends on compound type.

ISSN:0031-9104    

DOI:10.1080/00319109808030606

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The density ρ and the dynamic viscosity η of the ternary mixture heptane+methylcyclohexane+1-methylnaphtaiene were measured at 303.15, 323.15 and 343.15K at atmospheric pressure for molar fractionsxi=0, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, 0.875 and 1 (with Σi=13xi= 1). The experimental data for η and ρ (135 values) can be used to evaluate the excess volumeVEand the excess energy of activation for viscous flow ΔGE. The density is modelled over the entire experimental domain of composition and temperature with an absolute average deviation of 0.03% and the dynamic viscosity with an absolute average deviation of 0.7%.

ISSN:0031-9104    

DOI:10.1080/00319109808030607

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The liquid-gas phase behavior of a quasi two-dimensional fluid has been calculated using Zwanzig thermodynamic perturbation theory. The molecular model is that of hard disks with an inmmersed three dimensional point dipole. Calculations show the fluid phase coexistence for values of temperature lower than the critical temperature.

ISSN:0031-9104    

DOI:10.1080/00319109808030608

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The effect of Me4NI,n-Bu4NI,n-BuEt3NI, Et3PhNI and Et4NBez on the temperature of maximum density of water was determined using a dilatometric technique. The concentration range was from 0.005m to 0.050m in all cases. The temperature data was used to calculate Despretz constants using the equations ΔΦ=Φsot- Φwand ΔΦ=Kmm where Φsot- Φwis the difference between temperature of maximum density of the solution and of water,Kmis the Despretz constant. The equation of Kaulgud and Pokale ΔΦ+1,074m3/2=Kmwas also used.

ISSN:0031-9104    

DOI:10.1080/00319109808030609

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0031-9104    

DOI:10.1080/00319109808030602

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor