摘要:

The solubility of gases in liquids is analyzed in terms of the displacements theory, in particular the case where increasing solubility of gases is observed for rising temperature at room pressures. Heat effects are characterized for diluted binary mixtures and geometrical characteristics of phase envelopes (isopleths) are established. It is shown that gases which show increasing solubilities with temperature dissolve in heavy liquids by an endothermic process in the diluted range. A general approach, based on the analysis of critical lines and isopleths, is developed for all pressures and concentrations. It is demonstrated that increasing solubility will be observed if the isopleth of a liquid phase shows a nonmonotonous behavior. Conclusions and examples are illustrated using wellestablished cubic equations of state.

ISSN:0031-9104    

DOI:10.1080/00319109708030558

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The behaviour of a fluid mixture near a structureless hard wall is investigated. Following earlier work [D. Henderson, F. F. Abraham and J. A. Barker, Molec. Phys.31, 1291 (1976)] we consider the limiting case of a fluid mixture in which one of the species, representing the wall, is dilute and infinitely large. In this limit the Ornstein-Zernike equations yield the density distributions of each of the components with respect to the hard wall. The specific case of a mixture of hard spheres in contact with a hard wall is treated within the Percus-Yevick approximation and explicit results are obtained for a binary mixture. In addition to the density distributions simple expressions are obtained for the integrated densities. The density fluctuations in the fluid near the wall are small and short ranged for the hard sphere fluid. The effects of tails to the interatomic potentials outside the hard spheres can be incorporated approximately and could lead to much larger fluctuations in the densities.

ISSN:0031-9104    

DOI:10.1080/00319109708030559

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The properties of chalcogenide glass semiconductors of Bi29Tl35Se36is investigated by the electrical conductivity, thermoelectric power and thermal conductivity as a function of temperature from room temperature to near 500°C. The experimental data of the electrical conductivity and thermoelectric power are analyzed in terms of a model developed from the density of states and electrical transport in solid amorphous semiconductors[1]. The activation energy calculated from electrical conductivity data is found to be 0.11 eV for the solid and 0.66 eV for the liquid. Moreover, the coefficient of the linear decrease of energy gap with temperature was found to be γ=10.37 ×10−4eV/K°.

ISSN:0031-9104    

DOI:10.1080/00319109708030560

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The1H-NMR spectra of liquid binary mixtures of formamide (F) and N,N-dimethylformamide (DMF), were recorded at 298 K over almost the whole range of the mixed solvent compositions. From these data were found the values of the spectral parameter, Δδ(F-DMF). The densities (d12), viscosities (η12) of the mixed solvent were measured at 298.15 K, as well as the relative permittivities (e12) at 288.15 K, 293.15 K and 303.15 K. From all these data, the molar volumes (V12) and their deviations from ideality were calculated. Additionally, the temperature coefficients of relative permittivity, α12at 298.15 K were found. These structural parameters as functions of concentration suggest the formation of stable 2F • 3DMF, F • DMF, 3F • 2DMF and 2F • DMF× type complexes.

ISSN:0031-9104    

DOI:10.1080/00319109708030561

出版商:Taylor & Francis Group    

年代:1997

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:10.1080/00319109708030557

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor