The influence of long range interparticle correlations on the magnetically induced optical anisotropy in magnetic colloids

Socoliuc, Vlad; Popescu, Laurentiu

doi:10.1016/j.physa.2010.10.044

Cited by 7 publications

(7 citation statements)

References 14 publications

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“…In the zero-field case, the coefficients β 03 (equal to zero), β 04 , β 13 , and β 14 of the terms of order λ 3 , λ 4 , ϕλ 3 , and ϕλ 4 , respectively, are already known. 19,20 The effects of adding these contributions to the PDF are negligible over the ranges of parameters studied here.…”

Section: Discussionmentioning

confidence: 99%

“…One of the key characteristics of a ferrofluid is how the microscopic organization of the particles responds to an applied magnetic field, which in turn impacts upon rheology 2 and electromagnetic properties such as optical anisotropy. 3,4 All of these properties can be determined from knowledge of the anisotropy of the interparticle correlations characterized by the pair distribution function (PDF) g(r 12 ). Anisotropic, field-induced structure in a colloidal suspension can be locked in to place using chemical gelation, yielding an anisotropic magnetic gel or "ferrogel".…”

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: Discussionmentioning

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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“…13c) is due to magnetically induced anisotropy of the nanoparticles’ pair correlation function. 258,270–273…”

Section: Advanced Characterizationmentioning

confidence: 99%

“…Magneto-optical effects, such as field induced birefringence, dichroism and light scattering, are in strong correspondence with particle morphology, magnetic relaxation processes, magnetic dipole-magnetic field and long-range dipole-dipole interactions, 37,246,255,256 as well as formation of particle chains and more complex anisotropic structures. 245,[249][250][251]257,258 Unless highly diluted, the large number of dispersed particles makes ferrofluids opaque; however, when confined to optical paths of several hundreds of micrometers or less, they acquire the above mentioned magnetically controlled optical properties.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

“…13c) is due to magnetically induced anisotropy of the nanoparticles' pair correlation function. 258,[270][271][272][273] In the case of high colloidal stability low concentration ferrofluids particle clusters are practically absent; therefore, the rotation mechanism is the most plausible. During preparation nanoparticles with a non-ideal morphology result whose form can be approximated by an ellipsoid of revolution.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

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