Local order and global disorder in bidisperse ferrofluids

Rosenbaum, T. F.; Shi, Xudong; Nagel, Suzanne R.

doi:10.1021/j100009a050

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…Another type of quenched disorder occurs in systems of dipolar particles with the positions being frozen in an irregular configuration. Examples for such systems, which seem better described as amorphous solids rather than as liquids, are mixed crystals with polar impurities (e.g., K 1−x Li x TaO 3 ) [153,154], diluted dipolar-coupled magnets (e.g., LiHo x Y 1−x F 4 ) [155,156], assemblies of ultrafine ferromagnetic particles [157,158], and 'frozen ferrofluids' [159][160][161][162]. The latter systems result from a quench of an equilibrated ferrofluid into a state below the freezing temperature of the non-magnetic solvent.…”

Section: Positional Disordermentioning

confidence: 99%

Dipolar fluids under external perturbations

Klapp

2005

J. Phys.: Condens. Matter

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We discuss recent developments and present new findings on the structural and phase properties of dipolar model fluids influenced by various external perturbations. We concentrate on systems of spherical particles with permanent (point) dipole moments. Starting from what is known about the threedimensional systems, particular emphasis is given to dipolar fluids in different confining situations involving both simple and complex (disordered) pore geometries. Further topics concern the effect of quenched positional disorder, the influence of external (electric or magnetic) fields, and the fluid-fluid phase behaviour of various dipolar mixtures. It is demonstrated that due to the translational-orientational coupling and due to the long range of dipolar interactions even simple perturbations such as hard walls can have a profound impact on the systems. Contents1. Introduction 526 2. The unperturbed system 528 2.1. The impact of attractive interactions 532 3. Confinement by slit-pore geometries 532 3.1. Local and global ordering in strongly coupled confined fluids 533 4. Confinement by disordered porous media 535 4.1. Models and theoretical treatment 535 4.2. Properties of dipolar model fluids in disordered media 536 5. Positional disorder 537 5.1. Replica approach and the occurrence of global ferroelectric ordering 538 6. Field-induced structural effects 539 6.1. Integral equations for dipolar fluids with fluctuating orientational order 541 7. Size heterogeneities 542 7.1. Phase behaviour of binary dipolar mixtures 543

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Section: Positional Disordermentioning

confidence: 99%

Dipolar fluids under external perturbations

Klapp

2005

J. Phys.: Condens. Matter

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Anisotropic and Particle-Particle Interaction Effect in a One-Dimensional System of Magnetic Particles

Obeidat

Gharaibeh

Al-Safadi

et al. 2009

J Supercond Nov Magn

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Ferroelectric order in positionally frozen dipolar systems

Klapp

Patey

2001

The Journal of Chemical Physics

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We discuss the possibility of long-range ferroelectric order in an amorphous dipolar system. Our model consists of spheres with frozen positions and freely rotating three-dimensional dipole moments. Correlation functions are calculated by means of the hypernetted-chain integral theory combined with the replica method. Our results suggest that inhomogeneities in the frozen spatial structure induce a gradual local freezing of the dipole axes upon decreasing temperature. However, at sufficiently high densities and dipole moments, the long-range interactions dominate the short-range frustration, resulting in a ferroelectric transition. The estimated transition temperatures depend strongly on the degree of spatial correlation in the underlying system of frozen spheres. For a randomly frozen system, we find that the transition temperature is considerably lower than that predicted by mean field theory, and also lower than the temperature where simulations indicate the onset of glass-like behavior. Strong positional correlations can push the transition toward temperatures higher even than those observed for dipolar fluids.

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Local order and global disorder in bidisperse ferrofluids

Cited by 3 publications

References 2 publications

Dipolar fluids under external perturbations

Dipolar fluids under external perturbations

Anisotropic and Particle-Particle Interaction Effect in a One-Dimensional System of Magnetic Particles

Ferroelectric order in positionally frozen dipolar systems

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