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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster: Colloids and Complex Liquids

CPP 37.2: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster B2

Pearl chain to cluster transition dynamics of paramagnetic colloids in a rotating magnetic field — •Nebojsa Casic and Thomas Fischer — Univesitaet Bayreuth 95440 Bayreuth Germany

In a static magnetic field paramagnetic colloids form pearl chains, while the equilibrium conformation in a rotating field is a two dimensional cluster. When switching from a static to a rotating magnetic field a transient dynamics from a pearl chain to a two-dimensional cluster is observed. Two different dynamical regimes of cluster formation are observed. At low frequencies of the magnetic field the colloidal pearl chains fragment into rotating doublets that reassemble into clusters. At high frequencies each pearl chain curls up into two spirals wrapping the chain into a cluster. Attempts to explain the behavior in both regimes are presented.