Interface deformations affect the orientation transition of magnetic ellipsoidal particles adsorbed at fluid-fluid interfaces

Abstract

Manufacturing new soft materials with specific optical, mechanical and magnetic properties is a significant challenge. Assembling and manipulating colloidal particles at fluid interfaces is a promising way to make such materials. We use lattice-Boltzmann simulations to investigate the response of magnetic ellipsoidal particles adsorbed at liquid-liquid interfaces to external magnetic fields. We provide further evidence for the first-order orientation phase transition predicted by Bresme and Faraudo [Journal of Physics: Condensed Matter 19 (2007), 375110]. We show that capillary interface deformations around the ellipsoidal particle significantly affect the tilt-angle of the particle for a given dipole-field strength, altering the properties of the orientation transition. We propose scaling laws governing this transition, and suggest how to use these deformations to facilitate particle assembly at fluid-fluid interfaces.

arXiv comment7 pages, 8 figures

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• Assembling Ellipsoidal Particles at Fluid Interfaces using Switchable Dipolar Capillary Interactions
• Direct Assembly of Magnetic Janus Particles at a Droplet Interface
• Controlled Capillary Assembly of Magnetic Janus Particles at Fluid-Fluid Interfaces
• Effect of orientational restriction on monolayers of hard ellipsoids
• Interface crossing behavior of prolate microswimmers: thermo and hydrodynamics