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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Interfaces and Thin Films
CPP 4.6: Talk
Monday, March 18, 2024, 10:45–11:00, H 0111
Controllable Capillary Assembly of Magnetic Janus Particles at Fluid-Fluid Interfaces — •Qingguang Xie1 and Jens Harting1,2 — 1Helmholtz-Institut Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Erlangen, Germany — 2Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany
Self-assembly of particles at fluid-fluid interfaces is a promising route to fabricate functional materials from the bottom-up. However, directing and controlling particles into highly tunable and predictable structures, while essential, is a challenge. Here, we apply a hybrid approach combining the lattice Boltzmann, and the discrete element methods to investigate the behaviour of magnetic Janus particles adsorbed at a fluid-fluid interface interacting with an external magnetic field. Depending on their tilt angle and shape (e.g. sphere, ellipsoid), the anisotropic particles deform the interface and generate capillary dipoles or hexapoles. Driven by capillary interactions, multiple particles thus arrange into reconfigurable chain-, hexagonal-lattice-, and ring-like structures, which can be actively controlled by varying the external magnetic field. We develop interface energy models to reveal the underlying mechanism and find good qualitative agreement with simulation results. Our results have implications for the fabrication of varied microstructures for use in microdevices, organic electronics, or advanced display applications.
Keywords: controllable assembly; capillary interactions; Janus particle; fluid interface; lattice Boltzmann method