Structural and thermal properties of orientationally ordered dipolar fluids

Groh, B.; Dietrich, S.

doi:10.1103/physreve.53.2509

Cited by 86 publications

(63 citation statements)

References 23 publications

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“…35 Kiyohara et al confirmed the latter case using the Gibbs-ensemble Monte Carlo simulation method. 34 The opposite behavior of T c , that is, T c increases with the applied field, was also found in the needle-shaped system 36 and the spherical shaped system when ⑀Ј is equal to the dielectric constant of the system 34 or ⑀Јϭϱ. [32][33][34] In summary, the phase-coexistence behavior of the dipolar system is sensitive to the shape of the system and to the dielectric constant of the surrounding media in the presence of an external electric field.…”

Section: ͑25͒mentioning

confidence: 92%

Effects of external electric field on the interfacial properties of weakly dipolar fluid

Warshavsky

Bykov

Zeng

2001

The Journal of Chemical Physics

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In the framework of modified mean-field density-functional theory, effects of a uniform electric field on the interfacial properties of a model dipolar fluid ͓Teixeira and Telo da Gama, J. Phys.: Condens. Matter 3, 111 ͑1991͔͒ are studied. Both density and orientational order-parameter profiles of the planar vapor-liquid interface are obtained as a function of the field strength. For the dipolar fluids with reduced dipole moment 0 *р1, we find that the field ͑under the condition 0 *E*/T*Ӷ1͒ can shift the surface tension by few percent. We also find that the electric field actually reduces the thermodynamical surface tension but enhances the mechanical surface tension at the equimolar dividing surface. To detect these field effects on the surface tension we estimate the field strength which can be as high as 10 8 V/m.

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Section: ͑25͒mentioning

confidence: 92%

Effects of external electric field on the interfacial properties of weakly dipolar fluid

Warshavsky

Bykov

Zeng

2001

The Journal of Chemical Physics

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“…It has also been analyzed by density-functional theory [18][19][20]. Due to the long range of the dipolar interactions in this phase the equilibrium configuration exhibits a spatially inhomogeneous magnetization [21], similar to the domain formation in solid ferromagnets.…”

Section: Introductionmentioning

confidence: 99%

Orientational order in dipolar fluids consisting of nonspherical hard particles

Groh

Dietrich

1997

Phys. Rev. E

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We investigate fluids of dipolar hard particles by a certain variant of density-functional theory. The proper treatment of the long range of the dipolar interactions yields a contribution to the free energy which favors ferromagnetic order. This corrects previous theoretical analyses. We determine phase diagrams for dipolar ellipsoids and spherocylinders as a function of the aspect ratio of the particles and their dipole moment. In the nonpolar limit the results for the phase boundary between the isotropic and nematic phase agree well with simulation data. Adding a longitudinal dipole moment favors the nematic phase. For oblate or slightly elongated particles we find a ferromagnetic liquid phase, which has also been detected in computer simulations of fluids consisting of spherical dipolar particles. The detailed structure of the phase diagram and its evolution upon changing the aspect ratio are discussed in detail.

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“…The need to explore the changes that dipolar fluids undergo in the presence of an external electric/magnetic field stimulates both theoretical [1][2][3][4] and experimental [5,6] research activities. Nevertheless, there is no applicable theoretical model for the more complex case of dipolar fluid mixtures in an applied electric field.…”

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confidence: 99%