Dresden 2011 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Brownian Motion, Stochastic Processes, Transport I

DY 33.1: Talk

Thursday, March 17, 2011, 14:00–14:15, HÜL 186

Dynamics of self-assembly of flower-shaped magnetic colloidal clusters — •Ayan Ray, Saeedeh Aliaskarisohi, and Thomas M. Fischer — Institute of Physics, Universität Bayreuth, Bayreuth 95440, Germany

In a static magnetic field paramagnetic and nonmagnetic colloids immersed in a ferrofluid self-assemble into fluctuating colloidal flowers. Adsorption and desorption of nonmagnetic petals to larger paramagnetic cores and changes in the petal conformation around the paramagnetic core induce a fluctuating dynamics. We track the motion of colloidal petals on the paramagnetic core. Adsorption and desorption of petals occur on a larger time scale than the rotational diffusion of the petals. Magnetic dipole interactions split the motion of the petals into different modes of rotational diffusion. Modes of rotational diffusion that change the petal conformation are suppressed compared to the conformation invariant rotational diffusion of all petals. The suppression of higher modes of rotational diffusion results in a subdiffusive dynamics of the individual petals.