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Related Experiment Video

Updated: Jun 23, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

Published on: September 8, 2016

Active Brownian particles in quenched matrices.

Hye Ree Hyun¹, Inhyuk Jang¹, Arun Yethiraj¹

¹Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

The Journal of Chemical Physics

|June 22, 2026

Summary

This summary is machine-generated.

Active Brownian particles (ABPs) in complex matrices exhibit unique clustering behaviors. Some ABPs display fractional Brownian motion (FBM)-like dynamics, explaining variability in cellular environments.

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Area of Science:

Soft matter physics
Non-equilibrium systems
Statistical mechanics

Background:

Active particles convert stored energy into directed motion, leading to complex emergent behavior.
Real-world environments, like living cells, are often complex and heterogeneous.

Purpose of the Study:

Investigate the behavior of soft active Brownian particles (ABPs) in quenched disordered matrices.
Characterize the activity-dependent clustering and motion dynamics of ABPs.

Main Methods:

Simulated a 2D system of soft ABPs in quenched matrices.
Analyzed particle clustering, density, and activity using Peclet numbers.
Performed percolation analysis via Voronoi construction.
Examined particle trajectories for fractional Brownian motion (FBM) characteristics.

Main Results:

Matrices induce clustering in ABPs even at low densities and activities.
Clustering behavior transitions from increasing cluster number/decreasing size at low activity to the opposite at high activity.
Percolation threshold is higher for active particles than passive ones.
A fraction of ABPs exhibit FBM-like dynamics with scale-free velocity correlations, absent in passive or non-matrix active particles.

Conclusions:

The presence of a matrix significantly alters ABP clustering and dynamics.
FBM-like dynamics in ABPs suggest a physical origin for particle-to-particle variability observed in cellular environments.
Matrix polydispersity has a quantitative, not qualitative, impact on ABP properties.