On the theory of the magnetoviscous effect in ferrofluids

The microscopic origin of viscoelastic effects in ferrofluids is studied theoretically. The growth kinetics of chain aggregates formed by magnetic ferroparticles under the action of the dipole-dipole interaction between them is analyzed. It is shown that the evolution rate for an ensemble of chains...

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Bibliographic Details
Published inJournal of experimental and theoretical physics Vol. 110; no. 6; pp. 995 - 1004
Main Authors Zubarev, A. Yu, Chirikov, D. N.
Format Journal Article
LanguageEnglish
Published Dordrecht SP MAIK Nauka/Interperiodica 01.06.2010
Springer
Subjects
Analysis
Classical and Quantum Gravitation
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIPOLES
Disorder
ELASTICITY
Elementary Particles
EVOLUTION
Ferroalloys
FERROMAGNETISM
FLUIDS
KINETICS
LIQUIDS
MAGNETIC MATERIALS
MAGNETISM
MATERIALS
MECHANICAL PROPERTIES
MULTIPOLES
Order
Particle and Nuclear Physics
Phase Transition in Condensed System
Physics
Physics and Astronomy
Quantum Field Theory
Relativity Theory
SHEAR
Solid State Physics
STRESSES
VARIATIONS
VELOCITY
VISCOSITY
Particle Chain
Magnetic Dipole Interaction
Magnetic Fluid
Soft Matter Phys
Effective Viscosity
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Summary:The microscopic origin of viscoelastic effects in ferrofluids is studied theoretically. The growth kinetics of chain aggregates formed by magnetic ferroparticles under the action of the dipole-dipole interaction between them is analyzed. It is shown that the evolution rate for an ensemble of chains determines the rate of variation in the macroscopic stress of the medium upon a change in the applied external field and/or in the shear flow velocity. Consequently, the viscoelastic properties of magnetic fluids can be explained by the chain formation-destruction processes. The proposed microscopic model of a ferrofluid makes it possible (apparently, for the first time) to estimate the characteristic time of viscoelasticity corresponding to experimental results.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776110060105