Magnetization and susceptibility of ferrofluids

Szalai, István; Dietrich, S.

doi:10.1088/0953-8984/20/20/204122

Cited by 31 publications

(41 citation statements)

References 18 publications

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“…Translated into the synonymous electric language this means that we have obtained an analytical (implicit) equation for the electric field dependence of the polarization. Here, from our previous results [27], we deduce a formula for the nonlinear dielectric permittivity of dipolar fluids. Moreover, we compare our theoretical findings with canonical MC simulation data using the corresponding fluctuation formulae in the absence of external fields.…”

Section: Introductionmentioning

confidence: 81%

Nonlinear dielectric effect of dipolar fluids

Szalai

Nagy

Dietrich

2009

The Journal of Chemical Physics

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The nonlinear dielectric effect for dipolar fluids is studied within the framework of the mean spherical approximation (MSA) of hard core dipolar Yukawa fluids. Based on earlier results for the electric field dependence of the polarization our analytical results show so-called normal saturation effects, which are in good agreement with corresponding NVT ensemble Monte Carlo (MC) simulation data. The linear and the nonlinear dielectric permittivities obtained from MC simulations are determined from the fluctuations of the total dipole moment of the system in the absence of an applied electric field. We compare the MSA based theoretical results with the corresponding Langevin and Debye-Weiss behaviors and with actual experimental data.

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Section: Introductionmentioning

confidence: 81%

Nonlinear dielectric effect of dipolar fluids

Szalai

Nagy

Dietrich

2009

The Journal of Chemical Physics

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“…The presence of an external field brings an additional control that can be used to switch or modify the statistical states of the fluid. Liquid-vapor coexistence is a key aspect of the phase diagram of any liquid, and there has been much interest in liquid-vapor coexistence in dipolar systems in an external field both experimentally [2][3][4][5][6] and theoretically [5,[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Liquid-vapor interface of the Stockmayer fluid in a uniform external field

2015

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The effect of a uniform (non-spatially varying) external field on the liquid-vapor interface of the Stockmayer fluid (Lennard-Jones particles embedded with a point-dipole) has been investigated by molecular dynamics simulations. The long-ranged parts of both the dipole and Lennard-Jones interactions are treated using an Ewald summation, which removes the effects of the cutoff. The direction of the field shifts the critical point and interfacial properties in different directions. For an external field parallel to the interface, the critical temperature increases, while for a field applied perpendicular to the interface, it decreases. The effects of the field on surface tension and interfacial width are also investigated. For zero field, dipoles near the liquid-vapor interface show a weak orientation parallel to the interface. For fields parallel to the interface, ordering in the liquid phase is greater than the vapor, while for fields perpendicular to the interface, the opposite is true. * stamoor@sandia.gov

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“…Being one of the simplest models featuring anisotropic interactions, they play a paramount role in liquid-state theories. From an applied science point of view, the exhibited strong response to external fields makes them suitable for applications in colloid science [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

On the gas–liquid phase separation and the self-assembly of charged soft dumbbells

2013

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To cite this article: Molecular Physics (2013): On the gas-liquid phase-separation and the self-assembly of charged soft dumbbells,We investigate the phase behaviour of charged soft dumbbells, particles composed by two soft but oppositely charged sites, as a function of the separation between the sites. Via successive umbrella sampling Monte Carlo simulations we evaluate the equilibrium particle density of states. For elongated dumbbells, we recover the expected critical behaviour. However, reducing the elongation we are unable to locate the gas-liquid critical point in the accessible region of temperature and density. Correspondingly, the self-assembly of the particles in ring structures becomes dominant with respect to the formation of chain-like structures. Our results enrich the debate on the competition between self-assembly and phase-separation and contribute to the long-standing dilemma about the putative gas-liquid criticality in dipolar fluids.

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Magnetization and susceptibility of ferrofluids

Cited by 31 publications

References 18 publications

Nonlinear dielectric effect of dipolar fluids

Nonlinear dielectric effect of dipolar fluids

Liquid-vapor interface of the Stockmayer fluid in a uniform external field

On the gas–liquid phase separation and the self-assembly of charged soft dumbbells

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