| Combined efforts of experimental, theoretical and simulation studies performed over the last years have significantly improved the understanding of structural and dynamical properties of ferrofluids. Experiments on newly synthesized cobalt ferrofluids - well characterized and with a narrow particle size distribution - show huge magnetoviscous effects, where the zero-field viscosity increases by a factor 10 .. 100 due to an applied magnetic field. Such large variations in the viscosity are accompanied by dramatic structural changes that are detected by neutron scattering experiments under shear flow. Therefore, structure and rheology are intimately related in such ferrofluids. These results can be explained by the formation and breaking of chain-like aggregates of magnetic particles. Chain-formation under equilibrium conditions is covered in this review as a starting point for a discussion of the dynamics of these aggregates in terms of the kinetic chain model. Also the case of weak dipolar interactions is reviewed here, where systematic approximations allow to discuss the effect of dipolar interactions on the equilibrium magnetization. These studies have been extended recently, giving valuable insights into to role of weak dipolar interactions on dynamical, viscous and viscoelastic properties of ferrofluids.
for LaTeX users @article{PIlg2009-763,
author = {P. Ilg and S. Odenbach},
title = {Ferrofluid structure and rheology},
journal = {in: Colloidal Magnetic Fluids: Basics, Development and Applications of Ferrofluids, Series: Lecture notes in Physics, Springer, Berlin},
volume = {763},
pages = {},
year = {2009}
}
\bibitem{PIlg2009-763} P. Ilg, S. Odenbach,
Ferrofluid structure and rheology,
in: Colloidal Magnetic Fluids: Basics, Development and Applications of Ferrofluids, Series: Lecture notes in Physics, Springer, Berlin {\bf 763} (2009).PIlg2009-763
P. Ilg, S. Odenbach
Ferrofluid structure and rheology
in: Colloidal Magnetic Fluids: Basics, Development and Applications of Ferrofluids, Series: Lecture notes in Physics, Springer, Berlin,763,2009, |
mk@mat.ethz.ch
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