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Active colloidal systems with non-equilibrium self-organization is along-standing, challenging area in biology. To understand how hydrodynamic flowmay be used to actively control self-assembly of Janus particles (JPs), we usea model recently developed for the many-body hydrodynamics of amphiphilic JPssuspended in a viscous background flow (JFM, 941, 2022). We investigate howvarious morphologies arise from tuning the hydrophobic distribution of theJP-solvent interface. We find JPs assembled into uni-lamella, multi-lamella andstriated structures. To introduce dynamics, we include a linear shear flow anda steady Taylor-Green mixing flow, and measure the collective dynamics of JPparticles in terms of their (a) free energy from the hydrophobic interactionsbetween the JPs, (b) order parameter for the ordering of JPs in terms ofalignment of their directors, and (c) strain parameter that captures thedeformation in the assembly. We characterize the effective material propertiesof the JP structures and find that the uni-lamellar structures increasesorientation order under shear flow, the multilamellar structure behaves as ashear thinning fluid, and the striated structure possesses a yield stress.These numerical results provide insights into dynamic control ofnon-equilibrium active biological systems with similar self-organization.

Effects of Tunable Hydrophobicity on the Collective Hydrodynamics of Janus Particles under Flows