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Nonlinear response and crowding effects in microrheology.

I Ladadwa¹, A Heuer

¹Westfälische Wilhelms-Universität Münster, Institut für physikalische Chemie, Corrensstrasse 30, 48149 Münster, Germany. imad@ump.gwdg.de

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

|February 16, 2013

Summary

Molecular dynamics simulations reveal how tagged particles move in a microrheological setup. Crowding effects create stringlike structures, enhancing nonlinear responses under external forces.

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Area of Science:

Condensed Matter Physics
Soft Matter Physics
Computational Physics

Background:

Microrheology probes the mechanical properties of materials at the microscale.
Molecular dynamics (MD) simulations are crucial for understanding particle behavior in complex fluids.
Investigating particle mobility under external forces reveals fundamental rheological properties.

Purpose of the Study:

To investigate the mobility of tagged particles in a three-dimensional Lennard-Jones binary mixture using MD simulations.
To analyze the linear and nonlinear response regimes of driven probe particles.
To study the effects of temperature and the number of driven particles on observed phenomena.

Main Methods:

Molecular dynamics simulations of a 3D Lennard-Jones binary mixture.

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Applying a constant external driving force to a subset of particles.

Analyzing drift velocity and other observables of tagged probe particles.

Main Results:

Observed significant crowding effects in the nonlinear response regime.
Identified the formation of stringlike structures due to particle crowding.
Demonstrated that string formation enhances nonlinear rheological effects.
Systematically studied the dependence of these effects on temperature and the number of driven particles.

Conclusions:

Particle crowding and string formation are key factors influencing microrheology in this system.
The nonlinear response is significantly enhanced by these emergent structures.
Simulation results provide insights into the complex interplay between particle interactions, external forces, and emergent collective behavior.