ArticleProceedings of the National Academy of Sciences of the United States of America2018
Flow-induced phase separation of active particles is controlled by boundary conditions.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
- Surface Rolling Active Magnetic Emulsions.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2025Article
- Frozen by Heating: Temperature Controlled Dynamic States in Droplet Microswimmers.Advanced materials (Deerfield Beach, Fla.) · 2025Article
- Emergent dynamics due to chemo-hydrodynamic self-interactions in active polymers.Nature communications · 2024Article
- Shaping active matter from crystalline solids to active turbulence.Nature communications · 2024Article
- Symmetrically pulsating bubbles swim in an anisotropic fluid by nematodynamics.Nature communications · 2024Article
- Dynamic Clustering and Scaling Behavior of Active Particles under Confinement.Nanomaterials (Basel, Switzerland) · 2024Article
- Hydrodynamic interactions between squirmers near walls: far-field dynamics and near-field cluster stability.Royal Society open science · 2023Article
- Dynamics of Active SiOACS physical chemistry Au · 2023Article
- Arrested-motility states in populations of shape-anisotropic active Janus particles.Science advances · 2022Article
- Crooks Fluctuation Theorem for Single Polymer Dynamics in Time-Dependent Flows: Understanding Viscoelastic Hysteresis.Entropy (Basel, Switzerland) · 2021Article
- Migration of active filaments under Poiseuille flow in a microcapillary tube.The European physical journal. E, Soft matter · 2021Article
- Ice needles weave patterns of stones in freezing landscapes.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- Edge current and pairing order transition in chiral bacterial vortices.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- Self-propulsion in 2D confinement: phoretic and hydrodynamic interactions.The European physical journal. E, Soft matter · 2021Article
- Predator-prey interactions between droplets driven by non-reciprocal oil exchange.Nature chemistry · 2020Article
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Authors and funding
5 authors.
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Abstract
Active particles, including swimming microorganisms, autophoretic colloids, and droplets, are known to self-organize into ordered structures at fluid-solid boundaries. The entrainment of particles in the attractive parts of their spontaneous flows has been postulated as a possible mechanism underlying this phenomenon. Here, combining experiments, theory, and numerical simulations, we demonstrate the validity of this flow-induced ordering mechanism in a suspension of active emulsion droplets. We show that the mechanism can be controlled, with a variety of resultant ordered structures, by simply altering hydrodynamic boundary conditions. Thus, for flow in Hele-Shaw cells, metastable lines or stable traveling bands can be obtained by varying the cell height. Similarly, for flow bounded by a plane, dynamic crystallites are formed. At a no-slip wall, the crystallites are characterized by a continuous out-of-plane flux of particles that circulate and re-enter at the crystallite edges, thereby stabilizing them. At an interface where the tangential stress vanishes, the crystallites are strictly 2D, with no out-of-plane flux. We rationalize these experimental results by calculating, in each case, the slow viscous flow produced by the droplets and the long-ranged, many-body active forces and torques between them. The results of numerical simulations of motion under the action of the active forces and torques are in excellent agreement with experiments. Our work elucidates the mechanism of flow-induced phase separation in active fluids, particularly active colloidal suspensions, and demonstrates its control by boundaries, suggesting routes to geometric and topological phenomena in an active matter.
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