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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

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Hydrodynamic simulations of self-phoretic microswimmers.

Mingcheng Yang¹, Adam Wysocki, Marisol Ripoll

¹Theoretical Soft-Matter and Biophysics, Institute of Complex Systems, Forschungszentrum Jülich, 52425 Jülich, Germany. mcyang@iphy.ac.cn m.ripoll@fz-juelich.de.

|July 12, 2014

Summary

This study develops a mesoscopic hydrodynamic model for synthetic self-propelled Janus particles. The model reveals Janus particles exhibit short-range interactions, unlike microdimers which show long-range hydrodynamic effects.

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Area of Science:

Soft Matter Physics
Computational Fluid Dynamics
Colloidal Science

Background:

Self-propelled Janus particles are crucial for micro-robotics and targeted drug delivery.
Understanding their hydrodynamic interactions is key to controlling their collective behavior.
Existing models often simplify the complex fluid dynamics involved.

Purpose of the Study:

To develop a mesoscopic hydrodynamic model for simulating thermophoretically or diffusiophoretically driven Janus particles.
To investigate the self-propulsion mechanisms and hydrodynamic signatures of Janus particles.
To compare the behavior of Janus particles with microdimer swimmers.

Main Methods:

Development of a mesoscopic hydrodynamic model using multiparticle collision dynamics for the solvent.

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Incorporation of stick boundary conditions and colloid-solvent potential interactions.

Modeling asymmetric colloidal surfaces to induce self-phoretic properties.

Main Results:

The model accurately reproduces rotational dynamics and strong phoretic effects for passive colloids.
Janus particles exhibit short-range hydrodynamic interactions (1/r^3 decay), behaving as neutral swimmers.
Microdimer swimmers display long-range hydrodynamic interactions (1/r^2 decay) and act as pullers or pushers.

Conclusions:

The developed model provides a robust framework for simulating synthetic microswimmers.
Janus particles and microdimers exhibit distinct hydrodynamic interaction profiles.
This research offers insights into designing and controlling active colloidal systems.