The effect of dipolar forces on the structure and thermodynamics of classical fluids

Teixeira, Paulo Ivo Cortez; Tavares, J. M.; Gama, M. M. Telo da

doi:10.1088/0953-8984/12/33/201

Cited by 180 publications

(154 citation statements)

References 136 publications

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“…9 (a)], which corresponds to an average adsorption rate of Γ * = Nσ 2 / A ≈ 0.04, the particles clearly arrange into large clusters and chains with head-to-tail alignment of the dipole moments. This is the typical behavior expected in strongly coupled dipolar fluids under dilute conditions [43].…”

Section: Monte Carlo Simulation Resultssupporting

confidence: 69%

Monte-Carlo simulations of strongly interacting dipolar fluids between two conducting walls

Klapp

2006

Molecular Simulation

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Section: Monte Carlo Simulation Resultssupporting

confidence: 69%

Monte-Carlo simulations of strongly interacting dipolar fluids between two conducting walls

Klapp

2006

Molecular Simulation

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“…However, it has long been predicted that with strong dipolar interactions ferrofluid molecules can form chains and rings [62][63][64]. In order to describe such strong correlation effects, which lie beyond the meanfield description, it is necessary to use computationally intensive Monte Carlo and molecular dynamics techniques [65][66][67][68]. These methods suggest a complex and rich phase diagram.…”

Section: Classical Ferrofluids and Strongly Correlated Quantum Ferrofmentioning

confidence: 99%

Vortices and vortex lattices in quantum ferrofluids

Martin

Marchant

O’Dell

et al. 2017

J. Phys.: Condens. Matter

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The experimental realization of quantum-degenerate Bose gases made of atoms with sizeable magnetic dipole moments has created a new type of fluid, known as a quantum ferrofluid, which combines the extraordinary properties of superfluidity and ferrofluidity. A hallmark of superfluids is that they are constrained to rotate through vortices with quantized circulation. In quantum ferrofluids the long-range dipolar interactions add new ingredients by inducing magnetostriction and instabilities, and also affect the structural properties of vortices and vortex lattices. Here we give a review of the theory of vortices in dipolar Bose-Einstein condensates, exploring the interplay of magnetism with vorticity and contrasting this with the established behaviour in non-dipolar condensates. We cover single vortex solutions, including structure, energy and stability, vortex pairs, including interactions and dynamics, and also vortex lattices. Our discussion is founded on the mean-field theory provided by the dipolar Gross-Pitaevskii equation, ranging from analytic treatments based on the Thomas-Fermi (hydrodynamic) and variational approaches to full numerical simulations. Routes for generating vortices in dipolar condensates are discussed, with particular attention paid to rotating condensates, where surface instabilities drive the nucleation of vortices, and lead to the emergence of rich and varied vortex lattice structures. We also present an outlook, including potential extensions to degenerate Fermi gases, quantum Hall physics, toroidal systems and the Berezinskii-Kosterlitz-Thouless transition.

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“…Similar equilibrium clustering has been documented for dipolar fluids in the absence of van der Waals attractions. 34 We calculate the clustering behavior at fixed Tϭ2.0 with variable mp for additional values of by monitoring u pp and c V pp . For each , we define the approximate boundary mp * between clustered and dispersed states by the value of mp where c V pp is maximum.…”

Section: B Effect Of Interactionsmentioning

confidence: 99%

Origin of particle clustering in a simulated polymer nanocomposite and its impact on rheology

Starr

Douglas

Glotzer

2003

The Journal of Chemical Physics

216

183

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Many nanoparticles have short-range interactions relative to their size, and these interactions tend to be ''patchy'' since the interatomic spacing is comparable to the nanoparticle size. For a dispersion of such particles, it is not a priori obvious what mechanism will control the clustering of the nanoparticles, and how the clustering will be affected by tuning various control parameters. To gain insight into these questions, we perform molecular dynamics simulations of polyhedral nanoparticles in a dense bead-spring polymer melt under both quiescent and steady shear conditions. We explore the mechanism that controls nanoparticle clustering and find that the crossover from dispersed to clustered states is consistent with the predictions for equilibrium particle association or equilibrium polymerization, and that the crossover does not appear to match the expectations for first-order phase separation typical for binary mixtures in the region of the phase diagram where we can equilibrate the system. At the same time, we cannot rule out the possibility of phase separation at a lower temperature. Utilizing the existing framework for dynamic clustering transitions offers the possibility of more rationally controlling the dispersion and properties of nanocomposite materials. Finally, we examine how nanocomposite rheology depends on the state of equilibrium clustering. We find that the shear viscosity for dispersed configurations is larger than that for clustered configurations, in contrast to expectations based on macroscopic colloidal dispersions. We explain this result by the alteration of the polymer matrix properties in the vicinity of the nanoparticles. We also show that shear tends to disperse clustered nanoparticle configurations in our system, an effect particularly important for processing.

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The effect of dipolar forces on the structure and thermodynamics of classical fluids

Cited by 180 publications

References 136 publications

Monte-Carlo simulations of strongly interacting dipolar fluids between two conducting walls

Monte-Carlo simulations of strongly interacting dipolar fluids between two conducting walls

Vortices and vortex lattices in quantum ferrofluids

Origin of particle clustering in a simulated polymer nanocomposite and its impact on rheology

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