Forms and Flows of Ferrofluids

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• Dr Reinhard Richter, Experimentalphysik 5, Universität Bayreuth, Germany
• Friday 06 February 2009, 14:15-15:15
• Small Lecture Theatre, Cavendish Laboratory.

If you have a question about this talk, please contact Jurij Kotar.

Ferrofluids were an outcome of nano technology long before this term even existed. These colloidal dispersions of magnetic nanoparticles respond to magnetic fields in many ways. Particularly interesting is a plain layer of ferrofluid subjected to a constant, vertical magnetic field. When a critical value of the applied magnetic field is surpassed, a hexagonal array of liquid spikes emerges. Moreover square and stripe-like patterns as well as solitary spikes can be observed. We are measuring the surface relief by means of an X-ray technique and compare the results with the predictions of linear and nonlinear theory and simulations utilizing the finite element methode. —Other spectacular effects come into play when the ferrofluid is exposed to time-varying magnetic fields. We present recent results on the flow of ferrofluid exposed to alternating, rotating and traveling magnetic fields (“magnetic pump”).

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