Chemotactic self-caging in active emulsions

Abstract

A common feature of biological self-organization is how active agents communicate with each other or their environment via chemical signaling. Such communications, mediated by self-generated chemical gradients, have consequences for both individual motility strategies and collective migration patterns. Here, in a purely physicochemical system, we use self-propelling droplets as a model for chemically active particles that modify their environment by leaving chemical footprints, which act as chemorepulsive signals to other droplets. We analyze this communication mechanism quantitatively both on the scale of individual agent-trail collisions as well as on the collective scale where droplets actively remodel their environment while adapting their dynamics to that evolving chemical landscape. We show in experiment and simulation how these interactions cause a transient dynamical arrest in active emulsions where swimmers are caged between each other's trails of secreted chemicals. Our findings provide new insight into the collective dynamics of chemically active particles and yield principles for predicting how negative autochemotaxis shapes their navigation strategy.

References in corpus (30)

• Self-motile colloidal particles: from directed propulsion to random walk
• Dynamic clustering in active colloidal suspensions with chemical signaling
• Bacterial hopping and trapping in porous media
• Chemotaxis and auto-chemotaxis of self-propelling artificial droplet swimmers
• Clusters, asters and collective oscillations in chemotactic colloids
• Predator-Prey Interactions between Droplets Driven by Nonreciprocal Oil Exchange
• 'Fuelled' motion: phoretic motility and collective behaviour of active colloids
• Dynamic clustering and chemotactic collapse of self-phoretic active particles
• Active phase separation in mixtures of chemically interacting particles
• Collective Thermotaxis of Thermally Active Colloids
• Clustering and pattern formation in chemorepulsive active colloids
• The topography of the environment alters the optimal search strategy for active particles
• Phoretic Interactions Between Active Droplets
• Pairing, waltzing and scattering of chemotactic active colloids
• Active glasses
• Self-assembly of colloidal molecules due to self-generated flow
• Nonlinear dynamics of a chemically-active drop: from steady to chaotic self-propulsion
• Emergence of bimodal motility in active droplets
• Effective dynamics of microorganisms that interact with their own trail
• Collective Dynamics of Dividing Chemotactic Cells
• Spontaneously rotating clusters of active droplets
• Tunable active rotational diffusion in swimming droplets
• Multicellular self-organization of P. aeruginosa due to interactions with secreted trails
• Collisions and rebounds of chemically-active droplets
• Nonequilibrium polarity-induced mechanism for chemotaxis: emergent Galilean symmetry and exact scaling exponents
• Instabilities driven by diffusio-phoretic flow on catalytic surfaces
• A fine balance of chemotactic and hydrodynamic torques: when microswimmers orbit a pillar just once
• Alignment and scattering of colliding active droplets
• Self-trapping self-repelling random walks
• Self-avoidant memory effects on enhanced diffusion in a stochastic model of environmentally responsive swimming droplets

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• We the Droplets: A Constitutional Approach to Active and Self-Propelled Emulsions
• Oscillatory rheotaxis of active droplets in microchannels
• The 2024 Motile Active Matter Roadmap
• Emergent dynamics due to chemo-hydrodynamic self-interactions in active polymers
• Self-solidifying active droplets showing memory-induced chirality
• Interfacial activity dynamics of confined active droplets
• Marangoni droplets of dextran in PEG solution and its motile change due to coil-globule transition of coexisting DNA
• Mode-Switching of Active Droplets in Macromolecular Solutions
• Hydrodynamic efficiency limit on a Marangoni surfer
• Acoustic signaling enables collective perception and control in active matter systems
• Rigid flocks, undulatory gaits, and chiral foldamers in a chemically active polymer
• Minimal mechanism for flocking in phoretically interacting active particles
• Arrested on heating: controlling the motility of active droplets by temperature
• Current fluctuations of a self-interacting diffusion on a ring
• Biolocomotion and premelting in ice
• A numerical framework for phoretic particles
• Flocking transition in phoretically interacting active particles with pinning disorder
• Learning general pair interactions between self-propelled particles
• Extension and dynamical phases in random walkers depositing and following chemical trails