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Related Experiment Video

Updated: Jan 17, 2026

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Published on: March 13, 2016

Activation of colloidal patchy particle networks.

H J Jonas¹, N Oikonomeas², P Schall²

¹van't Hoff Institute for Molecular Sciences, University of Amsterdam, PO Box 94157, 1090 GD Amsterdam, The Netherlands. p.g.bolhuis@uva.nl.

|September 24, 2025

Summary

This summary is machine-generated.

Adding active particles to colloidal gels creates dynamic structures. Increasing activity leads to void-rich networks, fragmented clusters, or phase separation, impacting bond dynamics.

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Last Updated: Jan 17, 2026

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Published on: May 28, 2016

Area of Science:

Soft Matter Physics
Colloidal Science
Non-equilibrium Systems

Background:

Active physical gels, like biological cytoskeletons, exhibit complex non-equilibrium physics due to continuous energy input.
Self-assembled colloidal architectures offer controllable experimental models for studying these active gels.

Purpose of the Study:

To numerically investigate the impact of self-propelled colloids (active Brownian particles) on network-forming colloidal dispersions.
To explore the structural and dynamical responses of these active physical gels across varying levels of particle activity.

Main Methods:

Numerical simulations of a colloidal dispersion with di-patch and tri-patch particles.
Introduction of active Brownian particles (self-propelled colloids) into the system.
Analysis of structural changes (e.g., void formation, fragmentation, phase separation) and bond probability.

Main Results:

Low activity: formation of inhomogeneous, void-rich structures.
Medium activity: network fragmentation into chain clusters and broad local density distributions.
High activity: emergence of motility-induced phase separation.
Structural changes are linked to alterations in bond probability, affecting bond formation and breakage rates.

Conclusions:

The activity of embedded particles significantly alters the structure and dynamics of colloidal gels.
The observed responses (void-rich, fragmented, or phase-separated states) are tunable by controlling particle activity.
Findings provide insights into the physics of active matter and self-assembled soft materials.