The jamming elasticity of emulsions stabilized by ionic surfactants

Scheffold, Frank; Wilking, James N.; Haberko, Jakub; Cardinaux, Frédéric; Mason, Thomas G.

doi:10.1039/C4SM00389F

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Journal article

The jamming elasticity of emulsions stabilized by ionic surfactants

Scheffold, Frank Department of Physics, University of Fribourg, Switzerland
Wilking, James N. Department of Chemistry and Biochemistry, University of California, Los Angeles, USA
Haberko, Jakub Department of Physics, University of Fribourg, Switzerland
Cardinaux, Frédéric Department of Physics, University of Fribourg, Switzerland
Mason, Thomas G. Department of Chemistry and Biochemistry, University of California, Los Angeles, USA - Department of Physics and Astronomy, University of California, Los Angeles, USA

25.06.2014

Published in:

Soft Matter. - 2014, vol. 10, no. 28, p. 5040–5044

English 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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language