Regensburg 2016 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 5: Colloids and Complex Fluids II (joint session CPP/BP/DY)
DY 5.9: Talk
Monday, March 7, 2016, 12:15–12:30, H51
Towards flexible and dynamic self-assembly from colloids with magnetic anisotropy — •Gabi Steinbach1,5, Dennis Nissen2, Manfred Albrecht2, Ekaterina V. Novak3, Pedro Sánchez4, Sofia Kantorovich3,4, Sibylle Gemming1,5, and Artur Erbe5 — 1Technische Universität Chemnitz, 09107 Chemnitz, Germany. — 2University of Augsburg, 86159 Augsburg, Germany. — 3Ural Federal University, 620000, Ekaterinburg, Russia. — 4University of Vienna, 1090 Vienna, Austria. — 5Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
Magnetic colloidal particles are a suitable model system for the study of self-assembly and dynamic processes on the microscale. Here, we illustrate the potential of directed, but flexible bonds for tailored structure formation. As an example, we present a system of colloidal microspheres that have an off-centered net magnetic moment pointing perpendicular to the particle surface. They are an experimental realization of the theoretical model of spheres with radially shifted point dipole (sd-particles). Experimentally we observed the formation of branched structures as result of two coexisting self-assembly patterns, which is untypical for homogeneous systems. We show that the bistability can be explained by an extended model of sd-particles. This framework takes the broad magnetization distribution in the experimental particles into account. We will further show that the interacting particles exhibit interesting non-equilibrium dynamics when exposed to time-dependent fields, leading to reversible structural reconfigurations.