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Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 67: Poster: Active Matter, Microswimmers

DY 67.10: Poster

Thursday, March 15, 2018, 15:30–18:00, Poster A

Modeling the interaction of magnetically capped colloidal particles — •Anna Eichler-Volf1, Sibylle Gemming1,2, Aaron Tobias Strobel2, Maximilian Neumann2, Gabi Steinbach1,2, and Artur Erbe11Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Institute of Physics, Technische Universitaet Chemnitz, Chemnitz, Germany

Colloidal self-assembly bears significant potential for the bottom-up fabrication of advanced materials and micromechanical structures. For analyzing correlations between the anisotropy at the particle level and the shape of the assembly, simplified theoretical models have been developed to simulate the self-assembly and resulting structures. Here, we concentrate on particles that interact via polar fields, which are intrinsically anisotropic. Additional anisotropy may be introduced by an asymmetric distribution of the polar material, e.g. in a cap. Observed self-assembled structures can be reproduced by models of dipolar spheres, where the dipole is shifted away from the particle center. The three-dimensional model proposed here represents the extended magnetization distribution by a conductive coil enclosed in a hard sphere. The radius of the coil controls the width of the magnetization distribution. The position, or shift, of the coil inside the sphere determines the magnetic asymmetry.

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