Article

1999 ◽  
Vol 77 (11) ◽  
pp. 1946-1950 ◽  
Author(s):  
A D Buckingham ◽  
Y Tantirungrotechai
Keyword(s):  
Dielectric Constant ◽  
Virial Coefficient ◽  
Intermolecular Forces ◽  
Shape Parameters ◽  
Dipolar Fluids

We report the second dielectric virial coefficient Bε of a nonpolarizable dipolar Gay-Berne fluid. The second dielectric virial coefficient is evaluated for several sets of shape parameters and temperature. The second dielectric virial coefficient for rodlike molecules is negative while it is large and positive for disklike molecules. It decreases to zero on increasing the temperature.Key words: dipolar fluids, dielectric constant, intermolecular forces, shape parameters.

Intermolecular forces and properties of fluid. I. The automatic calculation of higher virial coefficients and some values of the fourth coefficient for the Lennard-Jones potential

1960 ◽  
Vol 254 (1279) ◽  
pp. 487-498 ◽  
Keyword(s):  
Virial Coefficient ◽  
Mathematical Problem ◽  
Virial Coefficients ◽  
Intermolecular Forces ◽  
Lennard Jones Potential ◽  
Intermolecular Potentials ◽  
Jones Potential ◽  
Lennard Jones ◽  
Experimental Values ◽  
First Time

The prediction of the virial coefficients for particular intermolecular potentials is generally regarded as a difficult mathematical problem. Methods have only been available for the second and third coefficient and in fact only few calculations have been made for the latter. Here a new method of successive approximation is introduced which has enabled the fourth virial coefficient to be evaluated for the first time for the Lennard-Jones potential. It is particularly suitable for automatic computation and the values reported here have been obtained by the use of the EDSAC I. The method is applicable to other potentials and some values for these will be reported subsequently. The values obtained cannot yet be compared with any experimental results since these have not been measured, but they can be used in the meantime to obtain more accurate experimental values of the lower coefficients.

scholarly journals Nonadditivity of Intermolecular Forces: Effects on the Third Virial Coefficient

1966 ◽  
Vol 44 (8) ◽  
pp. 2984-2994 ◽  
Author(s):  
A. E. Sherwood ◽  
Andrew G. De Rocco ◽  
E. A. Mason
Keyword(s):  
Virial Coefficient ◽  
Intermolecular Forces ◽  
The Third ◽  
Third Virial Coefficient

scholarly journals Dielectric behavior and AC electrical conductivity analysis of PMMA films

2019 ◽  
Vol 11 (20) ◽  
pp. 47-57
Author(s):  
Bushra A. Hasan
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Casting Process ◽  
Intermolecular Forces ◽  
Dielectric Behavior ◽  
Ac Electrical Conductivity ◽  
Dielectric Constant And Loss ◽  
Conduction Behavior ◽  
Calculated Activation Energy

PMMA films of different thickness (0.006, 0.0105, 0.0206, 0.0385 and 0.056cm) were synthesized by casting process. The temperature and frequency dependence of dielectric constant and AC electrical conductivity measurements at various frequencies (10kHz-10MHz) and temperatures (293-373K) were carried out. Few anomalies in dielectric studies were observed near 313 and 373 K respectively. These points were related to glass transitions temperature. The variation of activation energy and conduction behavior was studied .From the AC conduction studies, it is confirmed that the mechanism responsible for the conduction process is hopping of carriers. The variations of the dielectric constant and loss as function of frequency at different temperature was observed and the results were discussed. The calculated activation energy varied with the thickness, temperature, and applied frequency. Conductivity plots against frequency suggested that the response obeying the universal power law concerning the AC conductivity and dielectric behavior of polymer. The polarizability a increases with temperature but decreases with thickness indicating weekends and rising of intermolecular forces respectively.

Non-additivity of intermolecular forces: effects on the fourth virial coefficient

1974 ◽  
Vol 27 (2) ◽  
pp. 241 ◽  
Author(s):  
CHJ Johnson ◽  
TH Spurling
Keyword(s):  
Perturbation Theory ◽  
Long Range ◽  
Fourth Order ◽  
Virial Coefficient ◽  
Intermolecular Forces ◽  
The Third ◽  
Lennard Jones ◽  
Dipole Term ◽  
Third Virial Coefficient ◽  
Reduced Temperature

In this paper we give the results of computing the effect of non-additivity of long range forces on the fourth virial coefficient of a Lennard-Jones 12-6 gas. We have considered only dipolar effects but have included all terms up to the fourth order of perturbation theory. We have also calculated the effect of the fourth-order triple-dipole term on the third virial coefficient. For the fourth virial coefficient we find that the dispersion non-additivity, while being positive at low reduced temperatures, goes through a negative minimum at a reduced temperature of about 1.25 before becoming small and positive at high temperatures. This is in contradistinction to the behaviour of the third virial co-efficient where the dispersion non-additivity is always positive.

Dielectric constant and sample's shape in dipolar fluids

2000 ◽  
Vol 10 (PR5) ◽  
pp. Pr5-437-Pr5-440
Author(s):  
A. Alastuey ◽  
V. Ballenegger
Keyword(s):  
Dielectric Constant ◽  
Dipolar Fluids
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