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Related Experiment Video

Updated: Jul 17, 2026

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

Published on: October 24, 2017

Phases of granular segregation in a binary mixture.

P M Reis¹, T Sykes, T Mullin

¹Laboratoire PMMH (UMR 7636 CNRS-ESPCI-P6-P7), 10 Rue Vauquelin, 75231 Paris, France. preis@pmmh.espci.fr

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

|February 7, 2007

Summary

Granular segregation in shallow binary mixtures forms distinct phases. Segregation is suppressed by reducing filling fraction or increasing driving acceleration.

Area of Science:

Physics
Materials Science
Complex Systems

Background:

Granular materials exhibit complex behaviors, including segregation, influenced by external forces.
Understanding phase transitions in granular mixtures is crucial for predicting material behavior.

Purpose of the Study:

To experimentally investigate granular segregation in a shallow binary mixture.
To map the phase diagram of the mixture and identify conditions for segregation suppression.

Main Methods:

Utilized a vibrating horizontal tray to drive particle motion via frictional interactions.
Employed Voronoi tessellation measures to analyze particle distribution and phase identification.
Systematically varied control parameters: total filling fraction (C) and dimensionless acceleration (gamma).

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Last Updated: Jul 17, 2026

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Main Results:

Identified three distinct phases: binary gas (unsegregated), segregation liquid, and segregation crystal.
Determined critical values (Cc and gammac) for suppressing segregation.
Demonstrated that decreasing C below Cc or increasing gamma above gammac inhibits segregation.

Conclusions:

Granular segregation is controllable through system parameters like filling fraction and driving acceleration.
The study provides a quantitative understanding of phase transitions in vibrated granular mixtures.
Findings have implications for designing and controlling granular systems in various applications.