# Rotational motion of dimers of Janus particles

## TL;DR

This paper theoretically investigates the complex rotational and translational motion of dimers composed of self-propelling Janus particles, revealing helical trajectories and rotational behaviors influenced by hydrodynamic interactions.

## Contribution

It introduces a kinetic model for Janus particle dimers that accounts for hydrodynamic effects, providing new insights into their motion patterns.

## Key findings

- Dimer moves on a helical path with rotation about its center of mass.
- Hydrodynamic interactions modify trajectory parameters but not qualitative motion.
- The model predicts consistent rotational and translational behaviors of Janus dimers.

## Abstract

We theoretically study the motion of a rigid dimer of self-propelling Janus particles. In a simple kinetic approach without hydrodynamic interactions, the dimer moves on a helical trajectory and, at the same time, it rotates about its center of mass. Inclusion of the effects of mutual advection using superposition approximation does not alter the qualitative features of the motion but merely changes the parameters of the trajectory and the angular velocity.