Regensburg 2004 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.82: Poster
Donnerstag, 11. März 2004, 16:00–18:00, Poster D
Magneto-rheological study in inverse magnetic fluids using polystyrene particles — •Saldivar-Guerrero Ruben1, Richte Reinhard1, Rehberg Ingo1, and Rodriguez-Fernandez Oliverio2 — 1Universitaet Bayreuth, Experimentalphysik V — 2Centro de Investigacion en Quimica Aplicada
Ferrofluids are colloidal suspensions of magnetic nanoparticles, which change their behaviour under control of an external magnetic field. But when for example, they are mixed with polystyrene particles, they present another interesting properties. The magneto-rheological fluid (MRF) obtained in this way, can show a solid-fluid transition by an application of a moderate magnetic field similar to electro-rehological fluids (ERF) under a electric field. It excels ERF’s because only moderates currents instead of high voltages are necessary. We study the rheological influence of the diameter of the immersed polymer particle in MRF and the relation between the coupling parameter l and the yield point ty for different magnetic fields applied. The results show that the rheological properties are increased when the particle diameter increases in a constant magnetic field. Also we investigate structure formation in the fluid by video microscopy when a magnetic field is applied.