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Janus particles have attracted significant interest as building blocks forcomplex materials in recent years. Furthermore, capillary interactions havebeen identified as a promising tool for directed self-assembly of particles atfluid-fluid interfaces. In this paper, we develop theoretical models describingthe behaviour of magnetic Janus particles adsorbed at fluid-fluid interfacesinteracting with an external magnetic field. Using numerical simulations, wetest the models predictions and show that the magnetic Janus particles deformthe interface in a dipolar manner. We suggest how to utilise the resultingdipolar capillary interactions to assemble particles at a fluid-fluidinterface, and further demonstrate that the strength of these interactions canbe tuned by altering the external field strength, opening up the possibility tocreate novel, reconfigurable materials.

Tunable Dipolar Capillary Deformations for Magnetic Janus Particles at Fluid-Fluid Interfaces