The Influence of the Magnetic Particles Concentration on the Magneto-Optical Properties of the Magnetic Fluids

When a magnetic field is applied to magnetic fluids (MF), various structures of MF are formed: chain-like structures in low fields, columnar, lamellar and striped structures in high fields, ellipsoidal structures in pulsed fields, and layered structures in rotating fields. The inner structures and particle distributions of MF in gradient magnetic fields are quite interesting, but very few works have been done on this. In the present study, the effects of magnetic field gradient on the structures of MF are investigated using a two-dimensional Monte Carlo simulation. The results show that a gradient distribution of magnetic particles is formed under gradient magnetic fields. Moreover, with increasing the field gradient, more magnetic particles are pushed to the right region and particle distribution changes from grass-like clusters to needle-like ones.

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Magnetoviscous Effects In Ferrofluids

Applied Rheology ◽

10.1515/arh-2000-0011 ◽

2000 ◽

Vol 10 (4) ◽

pp. 178-184 ◽

Cited By ~ 10

Author(s):

S. Odenbach

Keyword(s):

Magnetic Field ◽

Magnetic Particles ◽

Magnetic Fluids ◽

Experimental Methods ◽

The State ◽

Theoretical Research ◽

Sedimentation Stability ◽

Nanometer Range ◽

Microscopic Models

Abstract Suspensions of magnetic particles with diameters in the nanometer range exhibit longterm sedimentation stability as well as the possibility of magnetic field induced control of their properties and flow. One of the most famous field induced effects is the change of viscosity of the fluids due to the action of magnetic influences. An explanation of these effects on basis of microscopic models is a challenging field of actual experimental and theoretical research. Within this article the state of knowledge on magnetoviscous effects in magnetic fluids will be summarized and in particular the experimental methods used to obtain related results will be discussed.

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Influence of the Magnetic Interaction among Particles on Distributions of Magnetic Fluids Using Computer Simulations

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.150-151.1595 ◽

2010 ◽

Vol 150-151 ◽

pp. 1595-1598

Author(s):

Xiao Ling Peng ◽

Hai Biao Wei ◽

Xiao Yang ◽

Rui Ping Yue ◽

Hong Liang Ge

Keyword(s):

Magnetic Field ◽

Magnetic Fields ◽

Magnetic Particles ◽

Particle Distribution ◽

Magnetic Field Gradient ◽

Magnetic Interaction ◽

Magnetic Fluids ◽

Colloidal Dispersion ◽

Gradient Distribution ◽

Particle Distributions

Magnetic fluid is a stable colloidal dispersion of ferromagnetic particles in a liquid carrier. Once a magnetic field is applied to magnetic fluids (MF), various structures of MF are formed. A detailed understanding of structures and particle distributions in gradient magnetic fields is much important. But very few works have been done on this. In the present study, the effects of magnetic field gradient and magnetic interaction among magnetic particles on the structures of MF are investigated using a two-dimensional Monte Carlo simulation. The results show that a gradient distribution of magnetic particles is formed under gradient magnetic fields. However, as the interaction between magnetic particles increases, the distribution gradient decreases, accompanied by the formation of chain-like clusters. Moreover, with increasing the magnetic interaction, particle distribution changes from grass-like clusters to needle-like ones.

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