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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.11 [2004] >
IJEMS Vol.11(4) [August 2004] >
| Title: | Models for microrheology of complex magnetic fluids |
| Authors: | Raikher, Yu L
Rusakov, V V |
| Issue Date: | Aug-2004 |
| Publisher: | CSIR |
| IPC Code: | Int. Cl.7 H 01F 1/44 |
| Abstract: | A review of some aspects of orientational
magnetodynamics of viscoelastic magnetic fluids and ferrogels is given. As an
archetypal theoretical model we use an assembly of non-interacting dipolar
Brownian nanoparticles embedded in and coupled to a matrix that possesses
either a dynamic (Maxwellian) or a weak equilibrium (Hookean) elasticity or
both. With regard to their magnetic properties, the particles are assumed to be
rigid dipoles. In the mechanical aspect the particles are taken to be
two-dimensional, i.e., are modeled by disks, either inertial or inertia-less.
Two types of dissipative interaction between a particle and its environment—a
simple Stokes viscous friction and a friction with a simple exponential memory
(like in a Maxwellian fluid)—are analyzed. Using the linear response approach
we find the equilibrium correlation functions and the dynamic magnetic
susceptibilities of the media. For the case of inertia-less particles the
kinetic equation of rotary diffusion is derived and certain peculiarities in
its properties are discussed. |
| Page(s): | 253-261 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.11(4) [August 2004]
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