Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Focus: Magnetic Soft Matter I

CPP 19.2: Hauptvortrag

Dienstag, 24. März 2009, 10:00–10:30, ZEU 222

Field-dependent structure and rheology of magnetic fluids as seen from theory and simulations — •Patrick Ilg — Polymer Physics, ETH Zürich, Department of Materials, CH-8093 Zürich, Switzerland

The interplay between field- and flow-induced structure formation gives raise to very interesting transport properties of magnetic liquids like magnetoviscous and viscoelastic effects [1]. We briefly review some theoretical models of these phenomena, discuss their benefits and limitations and contrast them with simulation approaches [2]. Particular emphasis is laid on the relation between structural and rheological properties as a key issue for improving the current understanding of experimentally observed flow effects. Despite recent progress, there are several experimental findings that still present a challenge for theoretical and/or simulation approaches. Among other things, we mention hexagonal ordering in ferrofluids that might be induced by a delicate balance between steric repulsion and depletion interaction due to excess surfactants [3].

[1] S. Odenbach, J. Phys. Condens. Matter 15 (2003) S1497.

[2] P. Ilg and S. Odenbach, Ferrofluid Structure and Rheology, in “Colloidal Magnetic Fluids”, S. Odenbach (Ed.), Springer Lecture Notes in Physics, Vol. 763, 2009.

[3] P. Ilg, Eur. Phys. J. E 26 (2008) 169.