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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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Publication details

The article was received on 19 Feb 2014, accepted on 20 May 2014 and first published on 09 Jun 2014


Article type: Communication
DOI: 10.1039/C4SM00389F
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Soft Matter, 2014,10, 5040-5044

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    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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