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Colloidal assembly at fluid interfaces has a great potential for thebottom-up fabrication of novel structured materials. However, challenges remainin realizing controllable and tunable assembly of particles into diversestructures. Herein, we report the capillary assembly of magnetic ellipsoidalJanus particles at a fluid-fluid interface. Depending on their tilt angle, i.e.the angle the particle main axis forms with the fluid interface, theseparticles deform the interface and generate capillary dipoles or hexapoles.Driven by capillary interactions, multiple particles thus assemble into chain-,hexagonal lattice- and ring-like structures, which can be actively controlledby applying an external magnetic field. We predict a field-strength phasediagram in which various structures are present as stable states. Owing to thediversity, controllability, and tunability of assembled structures, magneticellipsoidal Janus particles at fluid interfaces could therefore serve asversatile building blocks for novel materials.

Controllable Capillary Assembly of Magnetic Ellipsoidal Janus Particles into Tunable Rings, Chains and Hexagonal Lattices