Criticality of dipolar fluids: Liquid-vapor condensation versus phase separation in systems of living polymers

Tavares, J. M.; Gama, M. M. Telo da; Osipov, M. A.

doi:10.1103/physreve.56.r6252

Cited by 71 publications

(58 citation statements)

References 14 publications

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“…The pair-interaction theory of Jordan, for example, is more successful on this particular point as it is a perturbation from the minimum-energy conformation of two interacting DHSs, rather than a perturbation theory starting from non-interacting DHSs. 16 There are other approaches which build upon the empirical observation that magnetic particles form chain-like clusters; [25][26][27][28] indeed, this is the only way to deal with strongly interacting magnetic particles that cluster even in the absence of an applied magnetic field. The current theory, however, is a systematic expansion that bridges the gap between non-magnetic and magnetic particles, and therefore is able to describe properly the significant interparticle correlations that occur even in the absence of distinct chain-like clusters.…”

Section: B Structure Factor S(k)mentioning

confidence: 99%

“…In these cases, it is assumed at the outset that chain-like clusters exist, and then the theory is developed to take in to account the fluctuations and structure within, and interactions between, the clusters. 16,[24][25][26][27][28] Of course, these situations are of interest experimentally, 29 and with regard to the connection between structure 30 and the putative fluid-fluid phase separation in ferromagnetic colloids. [31][32][33][34] Although interesting and important, these situations are rather unusual.…”

Section: Introductionmentioning

confidence: 99%

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Theory and simulation of anisotropic pair correlations in ferrofluids in magnetic fields

Elfimova

Иванов

Camp

2012

The Journal of Chemical Physics

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Articles you may be interested inMagnetic field role on the structure and optical response of photonic crystals based on ferrofluids containing Co0.25Zn0.75Fe2O4 nanoparticles J. Appl. Phys. 115, 193502 (2014) Anisotropic pair correlations in ferrofluids exposed to magnetic fields are studied using a combination of statistical-mechanical theory and computer simulations. A simple dipolar hard-sphere model of the magnetic colloidal particles is studied in detail. A virial-expansion theory is constructed for the pair distribution function (PDF) which depends not only on the length of the pair separation vector, but also on its orientation with respect to the field. A detailed comparison is made between the theoretical predictions and accurate simulation data, and it is found that the theory works well for realistic values of the dipolar coupling constant (λ = 1), volume fraction (ϕ ≤ 0.1), and magnetic field strength. The structure factor is computed for wavevectors either parallel or perpendicular to the field. The comparison between theory and simulation is generally very good with realistic ferrofluid parameters. For both the PDF and the structure factor, there are some deviations between theory and simulation at uncommonly high dipolar coupling constants, and with very strong magnetic fields. In particular, the theory is less successful at predicting the behavior of the structure factors at very low wavevectors, and perpendicular Gaussian density fluctuations arising from strongly correlated pairs of magnetic particles. Overall, though, the theory provides reliable predictions for the nature and degree of pair correlations in ferrofluids in magnetic fields, and hence should be of use in the design of functional magnetic materials.

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Section: B Structure Factor S(k)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory and simulation of anisotropic pair correlations in ferrofluids in magnetic fields

Elfimova

Иванов

Camp

2012

The Journal of Chemical Physics

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“…Using the N P T +test particle insertion technique, Szalai et al found that condensation exists only for µ 2 /ε Y σ 3 ≤ 9 [20]. In the light of this collected simulation evidence, several theoretical works set out to explain why the vapour-liquid transition disappears when the propensity for chaining (in the cases above, related to the strength of the dipolar interactions) exceeded some critical level [21][22][23][24]. Recent simulation and theoretical results have reignited the controversy.…”

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confidence: 99%

Vapour–liquid phase transition of dipolar particles

2009

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“…10,11 In a first stage, it was commonly assumed that some dispersion interaction should be present for liquid-vapor equilibrium ͑LVE͒ to exist. 4,12 Recently, however, new computer simulation results 8,9,13,14 seem to have reopened the discussion regarding the existence of LVE.…”

Section: Introductionmentioning

confidence: 99%

Demixing in binary mixtures of apolar and dipolar hard spheres

Almarza

Lomba

Martín

et al. 2008

The Journal of Chemical Physics

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We study the demixing transition of mixtures of equal size hard spheres and dipolar hard spheres using computer simulation and integral equation theories. Calculations are carried out at constant pressure, and it is found that there is a strong correlation between the total density and the composition. The critical temperature and the critical total density are found to increase with pressure. The critical mole fraction of the dipolar component on the contrary decreases as pressure is augmented. These qualitative trends are reproduced by the theoretical approaches that on the other hand overestimate by far the value of the critical temperature. Interestingly, the critical parameters for the liquid-vapor equilibrium extrapolated from the mixture results in the limit of vanishing neutral hard sphere concentration agree rather well with recent estimates based on the extrapolation of charged hard dumbbell phase equilibria when dumbbell elongation shrinks to zero ͓G. Ganzenmüller and P.

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Criticality of dipolar fluids: Liquid-vapor condensation versus phase separation in systems of living polymers

Cited by 71 publications

References 14 publications

Theory and simulation of anisotropic pair correlations in ferrofluids in magnetic fields

Theory and simulation of anisotropic pair correlations in ferrofluids in magnetic fields

Vapour–liquid phase transition of dipolar particles

Demixing in binary mixtures of apolar and dipolar hard spheres

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