Ferroelectric phase in Stockmayer fluids

Groh, B.; Dietrich, S.

doi:10.1103/physreve.50.3814

Cited by 139 publications

(121 citation statements)

References 36 publications

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“…The strongly anisotropic and long-ranged character of dipolar forces causes particular difficulties for the theoretical description of these systems. As long as one is not aiming for a quantitative description of a specific system but for general phenomena and trends, the so-called Stockmayer model has turned out to be rather useful [12]. It considers spherical particles interacting with Lennard-Jones (LJ) pair potentials plus point-like permanent dipoles at their centre.…”

Section: Introductionmentioning

confidence: 99%

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Phase transitions and ordering of confined dipolar fluids

Szalai

Dietrich

2009

Eur. Phys. J. E

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Abstract. We apply a modified mean-field density functional theory to determine the phase behavior of Stockmayer fluids in slit-like pores formed by two walls with identical substrate potentials. Based on the Carnahan-Starling equation of state, a fundamental-measure theory is employed to incorporate the effects of short-ranged hard-sphere-like correlations while the long-ranged contributions to the fluid interaction potential are treated perturbatively. The liquid-vapor, ferromagnetic-liquid-vapor, and ferromagneticliquid-isotropic-liquid first-order phase separations are investigated. The local orientational structure of the anisotropic and inhomogeneous ferromagnetic liquid phase is also studied. We discuss how the phase diagrams are shifted and distorted upon varying the pore width.

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Section: Introductionmentioning

confidence: 99%

“…Bulk dipolar fluids such as the Stockmayer model system may exhibit three distinct fluid phases: isotropic vapor, isotropic liquid, and ferromagnetic liquid [12,13]. (In the present study we focus on sufficiently high tema e-mail: szalai@almos.vein.hu b e-mail: dietrich@mf.mpg.de peratures so that freezing is not a concern [14].)…”

Section: Introductionmentioning

confidence: 99%

Phase transitions and ordering of confined dipolar fluids

Szalai

Dietrich

2009

Eur. Phys. J. E

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“…For a needle-shaped sample (parallel to the z-axis) the field strength inside the fluid is identical [12,19] to the external field E ext and 4πP = ( − 1)E ext , therefore the dielectric constant reads as…”

Section: The Case Of An External Fieldmentioning

confidence: 99%

Electric field dependence of phase equilibria of binary Stockmayer fluid mixtures

Gábor¹,

Szalai²

2008

Molecular Physics

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“…For a needle-shaped sample (parallel to the z-axis) the field strength inside the fluid is identical [12,19] to the external field E ext and 4P ¼ (" À 1)E ext , therefore the dielectric constant reads as…”

Section: The Case Of An External Fieldmentioning

confidence: 99%

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Gábor¹,

Szalai²

2008

Molecular Physics

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A perturbation theory based study of the effect of an external electric field on the phase equilibrium properties of binary Stockmayer fluids is presented. The dipole-dipole interaction and the applied field are treated as independent perturbations to a Lennard-Jones mixture, and the reference fluid is treated by the van der Waals one-fluid approximation. A third-order free energy expression in the electric field strength is established, and the dielectric constant is calculated for a needle-shaped sample parallel to the field direction. We present and discuss vapour-liquid and liquid-liquid equilibrium curves at a given temperature for some dipolar mixtures exposed to an electric field, including chlorodifluoromethane þ difluoromethane and acetonitrile þ methanol. A sufficiently high electric field may result in massive shifts of vapour pressures and critical or azeotropic points, and can considerably alter the properties of coexisting phases. The vapour pressure decreases with increasing field strength.

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Ferroelectric phase in Stockmayer fluids

Cited by 139 publications

References 36 publications

Phase transitions and ordering of confined dipolar fluids

Phase transitions and ordering of confined dipolar fluids

Electric field dependence of phase equilibria of binary Stockmayer fluid mixtures

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