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Colloids

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Related Experiment Video

Updated: Jul 16, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Anomalous collective dynamics in optically driven colloidal rings.

Yael Roichman¹, David G Grier, George Zaslavsky

¹Department of Physics and Center for Soft Matter Research, New York University, New York, New York 10003, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 16, 2007

Summary

Colloidal spheres in an optical vortex trap exhibit unexpected collective motion. Quenched disorder induces a transition to a chaotic dynamical state with power-law scaling, revealing insights into weak chaos.

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Area of Science:

Soft Matter Physics
Optical Trapping
Fluid Dynamics

Background:

Hydrodynamic coupling can induce collective motion in colloidal spheres.
Optical vortex traps are used to manipulate particles.

Purpose of the Study:

Investigate the dynamics of colloidal spheres in an optical vortex trap.
Explore the effect of quenched disorder on collective motion.

Main Methods:

Simulated three fluid-borne colloidal spheres.
Utilized a ringlike optical vortex trap.
Analyzed phase-space trajectories and collective fluctuations.

Main Results:

Observed a transition to a dynamical state driven by quenched disorder.
Characterized power-law divergence in phase-space trajectories.
Identified collective fluctuations with noninteger exponents.

Conclusions:

Quenched disorder induces weak chaos in the colloidal sphere system.
Observed scaling relationships link microscopic and macroscopic dynamics.
Findings are consistent with theoretical predictions for chaotic systems.