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Related Experiment Video

Updated: Dec 8, 2025

Multifunctional, Micropipette-based Method for Incorporation And Stimulation of Bacterial Mechanosensitive Ion Channels in Droplet Interface Bilayers

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Published on: November 19, 2015

Effective interactions mediated between two permeable disks in an active fluid.

Mahmoud Sebtosheikh¹, Ali Naji²

¹School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran. mahmoud-sebtosheikh@ipm.ir.

Scientific Reports

|September 24, 2020

Summary

Active Brownian particles (ABPs) interacting with permeable inclusions show altered spatial distributions. This leads to tunable effective interactions, including repulsion and attraction, summarized in phase diagrams.

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Area of Science:

Soft matter physics
Statistical mechanics
Active matter systems

Background:

Active Brownian particles (ABPs) are fundamental models for self-propelled entities.
Understanding particle interactions in confined or structured environments is crucial.
Permeable inclusions introduce complex boundary conditions in active systems.

Purpose of the Study:

Investigate steady-state properties of active Brownian particles around two permeable disklike inclusions.
Analyze how discontinuous motility fields affect particle distribution and inter-inclusion interactions.
Characterize the nature of effective interactions (repulsive/attractive) mediated by the active bath.

Main Methods:

Simulations of active Brownian particles in two dimensions.
Modeling of permeable inclusions with differing interior/exterior motility strengths.
Analysis of spatial particle distributions and derived effective interaction potentials.

Main Results:

Discontinuous motility fields significantly alter ABP spatial distribution.
Effective interactions between inclusions are mediated by ABP interfacial repulsions.
Both repulsive and attractive interaction regimes were identified and mapped in phase diagrams.

Conclusions:

Permeable inclusions with spatially varying motility create tunable interactions in active matter systems.
The interplay between particle activity, inclusion properties, and geometry dictates emergent collective behaviors.
Phase diagrams provide a comprehensive overview of interaction regimes in this active particle system.