# Hydrodynamic Swarming of Thermally Active Dimeric Colloids

## TL;DR

This paper investigates the collective behavior of thermophobic dimeric colloids, revealing how their shape and interactions lead to unique planar swarming patterns driven by hydrodynamics and phoretic effects.

## Contribution

It introduces hydrodynamic simulations of thermophobic dimer colloids, demonstrating their tendency to form planar swarms due to combined phoretic repulsion and hydrodynamic attraction.

## Key findings

- Formation of planar moving clusters due to combined interactions
- Hydrodynamic assembly results in flattened swarms
- Shape-dependent hydrodynamic effects influence collective behavior

## Abstract

Self-propelled phoretic colloids have recently emerged as a promising avenue for the design of artificial swimmers. These swimmers combine purely phoretic interactions with intricate hydrodynamics which critically depend on the swimmer shape. Thermophobic dimer shaped colloids are here investigated by means of hydrodynamic simulations, from the single particle motion to their collective behavior. The combination of phoretic repulsion with hydrodynamic lateral attraction favors the formation of planar moving clusters. The resulting hydrodynamic assembly in flattened swarms is therefore very specific to these dimeric active colloids.