Hydrodynamics of Janus particles self-assembled as vesicles

Janus particles have been widely used for self-assembly of mesoscopic structures with specific functions. Previously we constructed a model for self-assembly of Janus particles to form bilayer membranes under a hydrophobic potential (SIAM J. Multiscale Modeling, 2020). In this work we illustrate the hydrodynamics of a vesicle made of such bilayer membranes. We use boundary integral equations to examine the hydrodynamics under various conditions: a quiescent flow, a planar shear flow, a linear elongational flow, and a Poiseuille flow. From the simulation results we find strong similarities to the vesicle hydrodynamics of a permeable lipid bilayer membrane under these flowing conditions such as tank-treading motion, an asymmetric slipper, and membrane ruptures. Moreover, two Janus-particle leaflets exhibit intermonolayer slip, similar to those between two lipid monolayers, and we calculate the friction coefficients.