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Kinetic Aspects of Emulsion Stabilization by Surfactants: A Microfluidic Analysis

Abstract : In classical emulsification processes, surfactants play two roles: first, they reduce the interfacial tension, facilitating droplet deformation and rupture, and second, they reduce droplet coalescence. Here, we use a microfluidic emulsification system to completely uncouple these two processes, allowing stabilization against coalescence to be studied quantitatively and independently of droplet formation. We demonstrate that, in addition to the classical effect of stabilization by an increase of surfactant concentration, the dynamics of adsorption of surfactant at the water−oil interface is a key element for droplet stabilization. Microfluidic emulsification devices can therefore be tailored to improve emulsification while decreasing the concentration of surfactant by increasing the time before the droplets first come into contact.
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https://hal.archives-ouvertes.fr/hal-02148749
Contributor : Jean-Christophe Baret <>
Submitted on : Friday, March 26, 2021 - 3:30:31 PM
Last modification on : Friday, March 26, 2021 - 4:02:46 PM
Long-term archiving on: : Sunday, June 27, 2021 - 6:54:52 PM

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Jean-Christophe Baret, Felix Kleinschmidt, Abdeslam El Harrak, Andrew Griffiths. Kinetic Aspects of Emulsion Stabilization by Surfactants: A Microfluidic Analysis. Langmuir, American Chemical Society, 2009, 25 (11), pp.6088-6093. ⟨10.1021/la9000472⟩. ⟨hal-02148749⟩

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