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Related Experiment Video

Updated: Sep 20, 2025

Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops

Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops

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Chemotactic self-caging in active emulsions.

Babak Vajdi Hokmabad^1,2, Jaime Agudo-Canalejo^2,3, Suropriya Saha^2,3

¹Department of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany.

Proceedings of the National Academy of Sciences of the United States of America

|June 9, 2022

Summary

This summary is machine-generated.

Chemically active droplets create repulsive trails, leading to temporary self-organization and dynamical arrest in active emulsions. This study reveals how chemical signaling influences collective behavior and navigation strategies in such systems.

Keywords:

active matter caging chemotaxis microswimmers self-propelling droplets

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Area of Science:

Physical Chemistry
Soft Matter Physics
Chemical Physics

Background:

Active agents in biological systems often use chemical signaling for self-organization and collective movement.
Chemical gradients generated by these agents influence individual strategies and group migration patterns.

Purpose of the Study:

To investigate chemical communication and collective dynamics in a purely physicochemical system using self-propelling droplets.
To model active particles that modify their environment via self-generated chemical gradients acting as repulsive signals.

Main Methods:

Utilized self-propelling droplets as model active particles in a physicochemical system.
Analyzed agent-trail collisions and collective dynamics through experiments and simulations.
Quantitatively assessed the impact of chemical footprints on droplet interactions and environmental remodeling.

Main Results:

Demonstrated that droplets leave chemical footprints acting as chemorepulsive signals.
Observed transient dynamical arrest in active emulsions due to droplets being caged by chemical trails.
Showcased how negative autochemotaxis shapes droplet navigation strategies.

Conclusions:

Chemical signaling via self-generated gradients is a key mechanism for self-organization in active matter.
The study provides insights into the collective dynamics of chemically active particles.
Findings offer principles for predicting navigation strategies influenced by negative autochemotaxis.