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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Transition to a labyrinthine phase in a driven granular medium.

Simon Merminod¹, Timothée Jamin¹, Eric Falcon¹

¹Université Paris Diderot, Sorbonne Paris Cité, MSC, CNRS (UMR 7057), 75013 Paris, France.

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

|January 15, 2016

Summary

Researchers observed a labyrinthine phase in macroscopic particles, transitioning from a granular gas to a solid state. This pattern formation depends on the balance between interaction strength and kinetic agitation.

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Area of Science:

Physics
Complex Systems
Soft Matter

Background:

Labyrinthine patterns are observed in 2D physical systems with competing interactions.
Previous studies focused on colloidal or superparamagnetic particles using simulations and experiments.

Purpose of the Study:

To experimentally observe a labyrinthine phase in an out-of-equilibrium system of macroscopic particles.
To characterize the transition from a granular gas to a solid labyrinthine phase.
To model the formation of particle chains.

Main Methods:

Experimental observation of macroscopic, magnetized particles.
Particle tracking for spatial local structure analysis.
Varying the ratio of interaction strength to kinetic agitation.

Main Results:

Macroscopic particles organized into short, randomly oriented chains when sufficiently magnetized.
Characterized the transition from a granular gas to a solid labyrinthine phase.
A simple model was developed to explain chain formation.

Conclusions:

Demonstrated labyrinthine phase formation in an out-of-equilibrium macroscopic system.
The transition is governed by the interplay between attractive interactions and kinetic energy.
The findings provide insights into pattern formation in complex physical systems.