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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

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Driven probe particle dynamics in a bubble and pattern forming system.

C Reichhardt¹, C J O Reichhardt¹

¹Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

The Journal of Chemical Physics

|September 3, 2025

Summary

This summary is machine-generated.

We numerically studied how a probe particle moves through a system of particles with competing forces. Different driving forces reveal distinct dynamic states and transitions, impacting particle motion and drag.

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Area of Science:

Complex systems
Soft matter physics
Computational physics

Background:

Particles with competing interactions can form ordered structures like bubbles or stripes.
Understanding particle dynamics in such systems is crucial for material science and fluid dynamics.

Purpose of the Study:

To numerically investigate the dynamic behavior of a probe particle driven through a particle assembly with competing interactions.
To identify and characterize different dynamic motion regimes and phase transitions.

Main Methods:

Numerical simulations of a driven probe particle interacting with a system of particles exhibiting long-range repulsion and short-range attraction.
Analysis of particle motion, velocity-force relationships, and velocity fluctuations.

Main Results:

Identified distinct dynamic regimes: elastic/pinned, plastic bubble, and breakthrough.
Observed probe particle motion inducing bubble rearrangements, rotations, and particle plastic deformations.
Characterized transitions between dynamic states through effective drag and velocity-force curve signatures.

Conclusions:

The study maps the dynamic phase diagram of the driven particle system.
The findings reveal complex emergent behaviors and transitions in response to varying driving forces and system parameters.