Lindemann unjamming of emulsions

We study the bulk and shear elastic properties of barely-compressed, "athermal" emulsions and find that the rigidity of the jammed solid fails at remarkably large critical osmotic pressures. The minuscule yield strain and similarly small Brownian particle displacement of solid emulsions cl...

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Bibliographic Details
Published in:arXiv.org 2020-08
Main Author: Guerra, Rodrigo E
Format: Article
Language:English
Subjects:
Brownian motion
Catastrophic failure analysis
Elastic properties
Emulsions
Osmosis
Scaling laws
Stability criteria
Strain
Online Access:Get full text
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Summary:We study the bulk and shear elastic properties of barely-compressed, "athermal" emulsions and find that the rigidity of the jammed solid fails at remarkably large critical osmotic pressures. The minuscule yield strain and similarly small Brownian particle displacement of solid emulsions close to this transition suggests that this catastrophic failure corresponds to a plastic-entropic instability: the solid becomes too soft and weak to resist the thermal agitation of the droplets that compose it and fails. We propose a modified Lindemann stability criterion to describe this transition and derive a scaling law for the critical osmotic pressure that agrees quantitatively with experimental observations.
ISSN:2331-8422
DOI:10.48550/arxiv.2004.09594