Magneto-granulometric analysis of concentrated ferrocolloids

Pshenichnikov, A. F.; Mekhonoshin, V. V.; Lebedev, A. V.

doi:10.1016/s0304-8853(96)00067-4

Cited by 170 publications

(132 citation statements)

References 15 publications

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“…By replacing M on the right hand side of Eq. (3.16) by the expression for the ideal paramagnetic gas, one arrives at the equation proposed in [18].…”

Section: B the Leading Term: Polydisperse Weiss Modelmentioning

confidence: 99%

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Magnetization of concentrated polydisperse ferrofluids: Cluster expansion

Huke

Lücke

2003

Phys. Rev. E

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The equilibrium magnetization of concentrated ferrofluids described by a system of polydisperse dipolar hard spheres is calculated as a function of the internal magnetic field using the Born-Mayer or cluster expansion technique. This paper extends the results of Phys. Rev. E 62, 6875 (2000) obtained for monodisperse ferrofluids. The magnetization is given as a power series expansion in two parameters related to the volume fraction and the coupling strength of the dipolar interaction, respectively.

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“…By replacing M on the right hand side of Eq. (3.16) by the expression for the ideal paramagnetic gas, one arrives at the equation proposed in [18].…”

Section: B the Leading Term: Polydisperse Weiss Modelmentioning

confidence: 99%

“…Another theory dealing with arbitrary fields is the high temperature approximation [17]. A variant of this theory was proposed in [18] and extended in [19].…”

Section: Introductionmentioning

confidence: 99%

Magnetization of concentrated polydisperse ferrofluids: Cluster expansion

Huke

Lücke

2003

Phys. Rev. E

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“…Among them, the mean-spherical model [6,7], the thermodynamic perturbation model [8] and the modified variant of the effective field model [9] have been shown to give good results for the magnetic properties of ferrofluids with low or moderate concentration of magnetic particles (up to 10 − 12%). Taking χ L as a universal parameter in weak magnetic fields, all the above approaches lead to the same expression for the initial susceptibility…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study on the equilibrium magnetization properties and structure of ferrofluids

2002

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We investigate in detail the initial susceptibility, magnetization curves, and microstructure of ferrofluids in various concentration and particle dipole moment ranges by means of molecular dynamics simulations. We use the Ewald summation for the long-range dipolar interactions, take explicitly into account the translational and rotational degrees of freedom, coupled to a Langevin thermostat. When the dipolar interaction energy is comparable with the thermal energy, the simulation results on the magnetization properties agree with the theoretical predictions very well.For stronger dipolar couplings, however, we find systematic deviations from the theoretical curves.We analyze in detail the observed microstructure of the fluids under different conditions. The formation of clusters is found to enhance the magnetization at weak fields and thus leads to a larger initial susceptibility. The influence of the particle aggregation is isolated by studying ferrosolids, which consist of magnetic dipoles frozen in at random locations but which are free to rotate.Due to the artificial suppression of clusters in ferro-solids the observed susceptibility is considerably lowered when compared to ferrofluids.

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“…(Pshenichnikov et al, 1996). For the considered magnetic fluid we have that χ = 2.2 and χ L ≈ 1.47489.…”

Section: Results Of Computationsmentioning

confidence: 96%