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Related Experiment Video

Updated: Jul 12, 2025

Preparation and 3D Tracking of Catalytic Swimming Devices

Preparation and 3D Tracking of Catalytic Swimming Devices

Published on: July 1, 2016

Symmetrical Catalytic Colloids Display Janus-Like Active Brownian Particle Motion.

Richard J Archer¹, Stephen J Ebbens²

¹Molecular Robotics Laboratory, Department of Robotics, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|October 23, 2023

Summary

Symmetrical catalytic colloids exhibit motion similar to Janus colloids, suggesting subtle surface reactivity differences drive active Brownian particle motion. This research offers a simple method for producing motile active colloids.

Keywords:

Janus particles active colloids active matter catalysis colloids

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Area of Science:

Colloid and Surface Science
Active Matter Physics
Nanotechnology

Background:

Catalytic Janus colloids, featuring a catalyst on one hemisphere, are well-studied self-motile active colloid systems.
These systems utilize catalytic reactions, often involving platinum and hydrogen peroxide, to generate directed motion.

Purpose of the Study:

To comparatively investigate the motile behavior of symmetrical catalytic colloids.
To determine if symmetry in catalytic distribution affects active colloid motion compared to Janus colloids.
To explore the impact of introducing Janus structure to symmetrical colloids.

Main Methods:

Synthesis of symmetrical catalytic colloids via a solution-based metal salt reduction process.
Comparative analysis of motile behavior between symmetrical and Janus catalytic colloids.
Investigation of motion changes upon introducing Janus structure to symmetrical colloids via masking.

Main Results:

Symmetrical catalytic colloids demonstrate motile behavior equivalent to previously reported Janus colloids.
Introducing a Janus structure to symmetrical colloids did not significantly alter their motion.
Subtle variations in surface reactivity may suffice to produce Janus-like active Brownian particle motion.

Conclusions:

The motion of symmetrical and Janus catalytic colloids can be indistinguishable.
Symmetry-breaking phenomena or minor surface reactivity gradients may explain the observed motion.
This study provides a scalable route to produce active colloids with potentially unique properties.