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Updated: Dec 30, 2025

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

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Floor- or Ceiling-Sliding for Chemically Active, Gyrotactic, Sedimenting Janus Particles.

Sayan Das¹, Zohreh Jalilvand², Mihail N Popescu¹

¹Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, D-70569 Stuttgart, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 29, 2020

Summary

This summary is machine-generated.

Chemically active Janus particles exhibit sliding states near walls, influenced by gravity-driven sedimentation and self-propulsion. Their behavior, including simultaneous sliding at top and bottom surfaces, depends on sedimentation velocity and gyrotactic response.

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Area of Science:

Physics of active matter
Soft condensed matter physics
Colloidal science

Background:

Chemically active particles self-propel via surface reactions, creating chemical fields and hydrodynamic flows.
Interactions with confining surfaces lead to phenomena like wall-bound sliding states.
Janus particles, often used as model systems, are typically gyrotactic and sediment.

Purpose of the Study:

To theoretically investigate the occurrence of sliding states for gyrotactic, self-phoretic Janus particles near horizontal walls.
To quantify the influence of gravity-induced effects (sedimentation, gyrotaxis) on particle-wall interactions.
To construct phase diagrams mapping sliding states as a function of key physical parameters.

Main Methods:

Theoretical modeling of chemically active Janus particles.
Construction of state diagrams based on sedimentation velocity, gyrotactic response, and phoretic mobility.
Comparison of theoretical predictions with experimental data.

Main Results:

Sliding states can occur at horizontal walls (floors and ceilings).
Simultaneous sliding at both floor and ceiling is possible under specific conditions.
The parameter space reveals distinct regions for sliding at floor only, ceiling only, or no sliding states.
Theoretical predictions show good agreement with experimental observations.

Conclusions:

Gravity-induced effects significantly influence the wall-interaction behavior of active Janus particles.
The study provides a framework for understanding and predicting sliding states in active matter systems.
Experimental validation confirms the theoretical model's ability to capture complex particle dynamics near surfaces.