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Related Experiment Video

Updated: Dec 26, 2025

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Trapping flocking particles with asymmetric obstacles.

Raul Martinez¹, Francisco Alarcon, Juan Luis Aragones

¹Departamento de Física Teórica de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain. juan.aragones@uam.es.

|March 10, 2020

Summary

This summary is machine-generated.

Flocking particles, following Vicsek model rules, get trapped by chevron funnels, unlike run-and-tumble particles. This collective behavior in confined environments aids microfluidic device design.

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Area of Science:

Physics
Soft Matter
Microfluidics

Background:

Asymmetric obstacles can control particle motion and sorting.
Run-and-tumble particles are a model for active matter.
Collective motion in confined environments is crucial for biological and engineered systems.

Purpose of the Study:

To investigate the behavior of flocking particles near asymmetric obstacles.
To compare flocking particle dynamics with run-and-tumble particles.
To explore the potential for designing microfluidic devices based on these collective behaviors.

Main Methods:

Simulations of particles following Vicsek model aligning rules.
Introduction of a wall of funnel-shaped obstacles (chevrons).
Analysis of particle concentration and trapping dynamics.

Main Results:

Flocking particles exhibit collective trapping behind chevron funnels.
Concentration of flocking particles occurs on the side opposite the funnels.
Two trapping regimes observed: complete and dynamical.
Distinct behavior compared to run-and-tumble particles.

Conclusions:

Vicsek model flocking particles show unique collective trapping by asymmetric funnels.
This phenomenon allows for differential sorting of active particles.
Potential for creating microfluidic devices with controlled, perpendicular particle flows.