scholarly journals Solubility Parameters of Permanent Gases

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
Yizhak Marcus
Keyword(s):  
Temperature Dependence ◽  
Solubility Parameters ◽  
Attractive Interaction ◽  
Interaction Energies ◽  
Surface Tensions ◽  
Potential Wells ◽  
Boiling Points ◽  
Binary Collisions ◽  
Permanent Gases

The solubility parameters,δH(Tb), of nonreactive permanent gases at their boiling pointsTb(<290 K) are calculated from individually discussed values of their molar enthalpies of vaporization and densities obtained from the literature. These values are tabulated and where available the coefficients of the temperature dependence expressionδH(T)are also tabulated. The trends noted in theδH(Tb)values are dealt with and the values are compared with those reported in the literature and derived from the solubilities of the gases in various solvents. TheδH(Tb)values are shown to correlate linearly with the depths of the potential wells (attractive interaction energies,ε/kB) for binary collisions of the gaseous molecules and with the surface tensions,σ(Tb), of the liquefied gases.

scholarly journals Van der Waals interactions between polymers with sequence-specific polarizabilities: Stiff polymers and Gaussian coils

2016 ◽  
Vol 31 (02n03) ◽  
pp. 1641035 ◽  
Author(s):  
Bing-Sui Lu ◽  
Ali Naji ◽  
Rudolf Podgornik
Keyword(s):  
Interaction Energy ◽  
Van Der Waals ◽  
Pairwise Interaction ◽  
Van Der Waals Interaction ◽  
Van Der Waals Interactions ◽  
Attractive Interaction ◽  
Gyration Radius ◽  
Interaction Energies ◽  
Anisotropic Interaction ◽  
Decay Behavior

We consider the van der Waals interaction between a pair of polymers with quenched heterogeneous sequences of local polarizabilities along their backbones, and study the effective pairwise interaction energy for both stiff polymers and flexible Gaussian coils. In particular, we focus on the cases where the pair of polarizability sequences are (i) distinct and (ii) identical. We find that the pairwise interaction energies of distinct and identical Gaussian coils are both isotropic and exhibit the same decay behavior for separations larger than their gyration radius, in contradistinction to the orientationally anisotropic interaction energies of distinct and identical stiff polymers. For both Gaussian coils and stiff polymers, the attractive interaction between identical polymers is enhanced if the polarizability sequence is more heterogeneous.

Temperature Dependence of the Diffusion of 1,2-Dichloroethane, 1,1,1-Trichloroethane, Trichloroethylene, and Tetrachloroethylene in Air

1971 ◽  
Vol 49 (11) ◽  
pp. 1965-1967 ◽  
Author(s):  
Harry Watts
Keyword(s):  
Temperature Dependence ◽  
Diffusion Coefficients ◽  
Room Temperature ◽  
Evaporation Method ◽  
Temperature Range ◽  
Boiling Points ◽  
Rate Of Evaporation

The diffusion coefficients in air of 1,1-dichloroethane, 1,1,1-trichloroethane, trichloroethylene, and tetrachloroethylene have been measured over a temperature range from room temperature to close to their boiling points by a rate of evaporation method.

Surface tensions of mixtures at their boiling points

1988 ◽  
Vol 33 (4) ◽  
pp. 473-476 ◽  
Author(s):  
M. A. Kalbassi ◽  
M. W. Biddulph
Keyword(s):  
Surface Tensions ◽  
Boiling Points

THE PREPARATION AND PHYSICAL PROPERTIES OF ETHYL AND METHYL ACETYLENE

1931 ◽  
Vol 5 (3) ◽  
pp. 306-312 ◽  
Author(s):  
F. R. Morehouse ◽  
O. Maass
Keyword(s):  
Physical Properties ◽  
Liquid Ammonia ◽  
Alkyl Halide ◽  
Similar Data ◽  
Vapor Pressures ◽  
Surface Tensions ◽  
Temperature Range ◽  
Boiling Points

The method for preparing an alkyl acetylene by the action of an alkyl halide on sodium dissolved in liquid ammonia was modified in certain details. Ethyl and methyl acetylene were prepared and purified and their melting and boiling points determined. Vapor pressures, densities and surface tensions were measured over a considerable temperature range. These properties together with constants calculated from the data are compared with similar data for paraffins and olefines.

scholarly journals Statistical Thermodynamics and Ordering Kinetics of D019-Type Phase: Application of the Models for H.C.P.-Ti–Al Alloy

2008 ◽  
Vol 138 ◽  
pp. 283-302 ◽  
Author(s):  
Taras M. Radchenko ◽  
Valentin A. Tatarenko ◽  
Helena Zapolsky
Keyword(s):  
Phase Transformation ◽  
Temperature Dependence ◽  
Interatomic Interaction ◽  
Statistical Thermodynamics ◽  
Interaction Parameters ◽  
Atomic Fraction ◽  
Al Alloy ◽  
Interaction Energies ◽  
Experimental Phase Diagram ◽  
Kinetics Of

Using the self-consistent field approximation, the static concentration waves approach and the Onsager-type kinetics equations, the descriptions of both the statistical thermodynamics and the kinetics of an atomic ordering of D019 phase are developed and applied for h.c.p.-Ti–Al alloy. The model of order–disorder phase transformation describes the phase transformation of h.c.p. solid solution into the D019 phase. Interatomic-interaction parameters are estimated for both approximations: one supposes temperature-independent interatomic-interaction parameters, while the other one includes the temperature dependence of interchange energies for Ti–Al alloy. The partial Ti–Al phase diagrams (equilibrium compositions of the coexistent ordered α2-phase and disordered α-phase) are evaluated for both cases. The equation for the time dependence of D019- type long-range order (LRO) parameter is analyzed. The curves (showing the LRO parameter evolution) are obtained numerically for both temperature-independent interaction energies and temperature-dependent ones. Temperature dependence of the interatomic-interaction energies accelerates the LRO relaxation and diminishes a spread of the values of instantaneous and equilibrium LRO parameters versus the temperature. Both statistical-thermodynamics and kinetics results show that equilibrium LRO parameter for a non-stoichiometry (where an atomic fraction of alloying component is more than 0.25) can be higher than for a stoichiometry at high temperatures. The experimental phase diagram confirms the predicted (ordered or disordered) states for h.c.p.-Ti– Al.

Two one-dimensional Ising models with disorder points

1970 ◽  
Vol 48 (14) ◽  
pp. 1724-1734 ◽  
Author(s):  
John Stephenson
Keyword(s):  
Temperature Dependence ◽  
Short Range ◽  
Short Range Order ◽  
Nearest Neighbor ◽  
Ising Models ◽  
Zero Field ◽  
Interaction Energies ◽  
Pair Correlations ◽  
One Dimensional ◽  
Range Of Values

Pair correlations on two one-dimensional Ising models with next-nearest-neighbor interactions are calculated exactly. For an appropriate range of values of the interaction energies, each of these models exhibits a disorder point, at which the nature of the short-range order changes abruptly, and at which there is a cusp in the graph of range of order vs. temperature. The zero-field susceptibilities are calculated exactly, and are found to have quite smooth temperature dependence.

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