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SUMMARY:Forms and Flows of Ferrofluids - Dr Reinhard Richter\, Experimenta
 lphysik 5\, Universität Bayreuth\, Germany
DTSTART:20090206T141500Z
DTEND:20090206T151500Z
UID:TALK16198@talks.cam.ac.uk
CONTACT:Jurij Kotar
DESCRIPTION:Ferrofluids were an outcome of nano technology long before thi
 s term \neven existed. These colloidal dispersions of magnetic nanoparticl
 es \nrespond to magnetic fields in many ways. Particularly interesting is 
 a \nplain layer of ferrofluid subjected to a constant\, vertical magnetic 
 \nfield. When a critical value of the applied magnetic field is\nsurpassed
 \, a hexagonal array of liquid spikes emerges. Moreover square\nand stripe
 -like patterns as well as solitary spikes can be observed. We \nare measur
 ing the surface relief by means of an X-ray\ntechnique and compare the res
 ults with the predictions of linear and\nnonlinear theory and simulations 
 utilizing the finite element methode.\n-- Other spectacular effects come i
 nto play when the ferrofluid is\nexposed to time-varying magnetic fields.\
 nWe present recent results on the flow of ferrofluid exposed to\nalternati
 ng\, rotating and traveling magnetic fields ("magnetic pump").\n
LOCATION:Small Lecture Theatre\, Cavendish Laboratory
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