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01.06.2006 | Original Contribution

Aging of an unstable w/o gel emulsion with a nonionic surfactant

verfasst von: Julien Mougel, Oscar Alvarez, Christophe Baravian, François Caton, Philippe Marchal, Marie-José Stébé, Lionel Choplin

Erschienen in: Rheologica Acta | Ausgabe 5/2006

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Abstract

We study an unstable highly concentrated emulsion of water droplets in oil with a nonionic surfactant. A technique of light diffusion coupled to a rheometer allows simultaneous measurement of average droplet radius \(R\) and emulsion shear elastic modulus \(G \prime\) during time. Over the studied range of volume fraction (from 71 to 95%), we show that Princen and Kiss’ (J Colloid Interface Sci 112:427–437, 1986) model does not apply. A dimensional analysis based on the hypothesis of dominant van der Waals forces is proposed for nonionic surfactants, which is in good agreement with experimental data. We also show that the measured average droplet volume increases linearly with time and that the coalescence rate strongly depends on the volume fraction in relation with different topological conformations of droplets.

Vorheriger Artikel Numerical simulation of flow kinematics for suspensions containing continuously dispersed aspect ratio fibers

Nächster Artikel Rheological properties of suspensions of polyethylene-coated aluminum nanoparticles

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The following occurrences of “nonionic (ionic) emulsion” will be denoted by an emulsion in which the surfactant is nonionic (ionic).

Although our samples are highly concentrated, dependent diffusion is not involved because the average distance between droplets center is always big enough compared to the laser wavelength (Tsang et al. 2000).

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Titel: Aging of an unstable w/o gel emulsion with a nonionic surfactant
verfasst von: Julien Mougel
Oscar Alvarez
Christophe Baravian
François Caton
Philippe Marchal
Marie-José Stébé
Lionel Choplin
Publikationsdatum: 01.06.2006
Verlag: Springer-Verlag
Erschienen in: Rheologica Acta / Ausgabe 5/2006
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-006-0089-z

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