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Issue 28, 2014
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The jamming elasticity of emulsions stabilized by ionic surfactants

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Abstract

Oil-in-water emulsions composed of colloidal-scale droplets are often stabilized using ionic surfactants that provide a repulsive interaction between neighboring droplet interfaces, thereby inhibiting coalescence. If the droplet volume fraction is raised rapidly by applying an osmotic pressure, the droplets remain disordered, undergo an ergodic–nonergodic transition, and jam. If the applied osmotic pressure approaches the Laplace pressure of the droplets, then the jammed droplets also deform. Because solid friction and entanglements cannot play a role, as they might with solid particulate or microgel dispersions, the shear mechanical response of monodisperse emulsions can provide critical insight into the interplay of entropic, electrostatic, and interfacial forces. Here, we introduce a model that can be used to predict the plateau storage modulus and yield stress of a uniform charge-stabilized emulsion accurately if the droplet radius, interfacial tension, surface potential, Debye screening length, and droplet volume fraction are known.

Graphical abstract: The jamming elasticity of emulsions stabilized by ionic surfactants

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Article information


Submitted
19 Feb 2014
Accepted
20 May 2014
First published
09 Jun 2014

Soft Matter, 2014,10, 5040-5044
Article type
Communication
Author version available

The jamming elasticity of emulsions stabilized by ionic surfactants

F. Scheffold, J. N. Wilking, J. Haberko, F. Cardinaux and T. G. Mason, Soft Matter, 2014, 10, 5040
DOI: 10.1039/C4SM00389F

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