Motion of two micro-wedges in a turbulent bacterial bath

TL;DR

This study investigates how two micro-wedges move and self-assemble in a turbulent bacterial bath through simulations and experiments, revealing stable configurations and collective motion patterns.

Contribution

It combines computer simulations and experiments to analyze the dynamics and self-assembly of micro-wedges in a bacterial bath, providing new insights into active matter behavior.

Findings

Micro-wedges tend to move closer and stack due to bacterial activity.

A stable mode where two micro-wedges follow each other at the same velocity.

Qualitative agreement between simulations and experiments.

Abstract

The motion of a pair of micro-wedges ("carriers") in a turbulent bacterial bath is explored using computer simulations with explicit modeling of the bacteria and experiments. The orientation of the two micro-wedges is parallel and fixed by an applied magnetic field but the translational coordinates can move freely as induced by the bacterial bath. As a result, two carriers of same orientation move such that their mutual distance decreases. Eventually the two carriers stack on each other with no intervening bacteria exhibiting a stable dynamical mode where the two micro-wedges follow each other with the same velocity. These findings are in qualitative agreement with experiments on two micro-wedges in a bacterial bath. Our results provide insight into understanding the self-assembly of many micro-wedges in an active bath.