Berlin 2005 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 34: Poster
DY 34.101: Poster
Montag, 7. März 2005, 15:30–18:00, Poster TU D
Experiments on Chain Formation Dynamics in Inverse Ferrofluids — •Tobias Sebald1, Reinhard Richter1, Christian Gollwitzer1, Tobias Schnautz1, Ruben Saldivar-Guerrero1,2, and Ingo Rehberg1 — 1Experimentalphysik V, University of Bayreuth, D-95440 Bayreuth, Germany — 2Centro de Investigacion en Quimica aplicada, 25100 Saltillo, Coahuila, Mexico
By disperging microsized polystyrene particles in ferrofluid an ideal magneto-rheological model fluid can be synthesized. The nonmagnetic polystyrene particles create holes in the ferrofluid, which appear to posses a magnetic moment corresponding to the amount and suszeptibility of the displaced fluid. Due to the dipolar interactions of the holes, chain formation sets in. We investigate this process in a quasi two dimensional layer inbetween two glass plates via a long distance video microscope. Here the magnetic field is oriented parallel to the plates, and applied in a pulse like manner. The number of particles in the chains and columns are extracted from the pictures. The average length shows to follow a logistic function in time. Moreover, structure formation of the agglomerates under shear flow is experimentally investigated.